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Title: K29 Automatic Rifle
Description: tl;dr: see pics.


Agrandov - December 7, 2008 12:20 AM (GMT)
user posted image

K29 AUTOMATIC RIFLE
Information


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K29 Automatic Rifle with S11v4 sight.

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K29 Automatic Carbine with S11v4 sight, Night pattern.

History

The K29 Automatic Rifle brings to fruition a decade-long research and development project that focussed on three aspects: the rifle, the ammunition and the sight. Started by Overwatch Inc. in 1999, the first usable result came in 2002 with the production of the XK14 General Infantry Weapon. This evolved into the XK17 in 2004, the first of the series to use Cased Telescopic Ammunition (CTA). In 2006 the XK22 was swiftly rejected from a contest to be the primary weapon for Agrandov’s Central State Marine Corps, although the series was starting to get noticed. The XK26 was used in limited quantities with the Central State Air Force, although the breakthrough came in 2007 with the XK27, Model 4. The rifle was everything the Army was looking for, and tests were merely a formality with the K274 set to be the next service rifle for the soldiers in Agrandov.

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K274 Automatic Rifle in standard configuration.

In early 2008 however, during the final round of testing, the K274 was blindsided by a joint venture between Stalwart Inc. – Overwatch’s main rivals – and Doomingsland Defense Industries. This unlikely union produced the AVIR Advanced Personal Weapon System, which is still the fastest-selling small-arm in history. Overwatch designers were sent furiously back to the drawing board as the AVIR started to replace the mixed-bag of rifles in Agrandan service. The team, now a few hundred members strong with a division of mercenaries employed full time for testing, emerged in mid 2008 with a revised and improved weapon called the K28 Automatic Rifle.

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K28 Automatic Rifle with an early S9v1 sight.

Arising just as some officials were having second thoughts about the AVIR’s 6.7x35mm CTA ammunition, the K28 was adopted by all elements of the CSMC and CSAF. The Agrandan Army in a snap decision adopted the new AVIR 2 as a PDW to replace existing AVIR systems, and took up the K28 as the standard service rifle. The K28 performed exceptionally well on the international market, being adopted in the hundreds of millions by several armies of Gholgoth and even some of Haven. It is estimated that there are 1.5 billion original K28 rifles or licensed copies in existence. An immediate follow-up was planned for the special-forces market, a bullpup conversion of the K28 billed tentatively as the K29.

Disaster struck in November 2008 however as Overwatch Inc. surprisingly went bankrupt. All twelve of the Board of Directors, as well as the CEO and seventeen senior managers were indicted on charges of murder after evidence emerged linking the company to the “crash” of a government-owned helicopter in 2006. Thirty of the top fifty shareholders sold off all of their stock to prepare for the impending legal fees in a scandal that destroyed all confidence in the company. The remains were bought up eagerly by rivals Stalwart Inc., who immediately saw promise in the pending K29 system and took it on as a priority project.

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K29 Automatic Rifle without the unique sight.

Description

The K29 Automatic Rifle straddles the gap between the true “assault” rifles and the larger “battle” rifles, similar to the K28 in that it can be used in a variety of roles without any modification. However, the bullpup design brings a significant disadvantage in this regard as the K29 cannot comfortably accept high capacity magazines; ensuring a niche for the K28 as a support weapon. Despite this drawback the K29 is vastly superior in both the assault and sniper roles, offering improved performance in a shorter and much lighter unit. The K29 is also better balanced, as with the S11v4 and standard forend the point of balance is just above the pistol grip. This makes the rifle feel lighter, and it makes it much easier to manoeuvre. It uses long-stroke gas operation, with the barrel spring-locked to the gas system for lasting consistency when firing.

The weapon uses the same internal system as the K28, resulting in 90% internal parts commonality. The heavy steel bolt carrier and other moving parts were kept to mitigate recoil, and the recoil spring has been replaced with one that is shorter and tougher. Recoil is also reduced with a balanced gas system that has been present since the K274. This removes three out of the four contributors to recoil, making the K29 controllable in fully-automatic fire using the new M235 ammunition in Agrandan service. The internal system delivers the same extreme reliability and accuracy the K28 was famous for, and the longer 500mm barrel used as standard means that there is a noticeable performance increase.

Perhaps the most important feature of the K29 is the hybrid closed/open bolt system on the automatic setting. In semi-automatic the weapon fires each shot from a closed bolt for maximum accuracy, requiring one trigger pull per shot for accurate and deliberate fire. On the fully automatic setting however, the weapon fires the first shot from the closed bolt position and then fires from an open bolt. The forward assist is applied automatically when the trigger is pulled, meaning that each burst will be fired with maximum accuracy without the shooter having to continually reach for the charging handle to close the bolt. To do this a two-stage trigger was used, meaning that when a light force is applied the trigger stops moving and the bolt closes. If the trigger is pulled from this point 2.5kg of pull is required to fire the weapon, but if the trigger is released then the bolt stays closed.

The K29, like the K28, features two ejection ports which the user can quickly switch between for maximum ambidexterity. This is done by pressing a sharp object - usually the standard push-pin removal tool - into an opening just behind of the ejection. When active, a red marker is present in the opening. The other controls of the rifle are completely ambidextrous: there is a fire selector on each side and the magazine release is operated by either one of the user’s thumbs. The charging handle is also present on both sides, so the weapon can be used by anyone without alteration.

In a radical departure from the previous rifles in the series, the K29 uses Carbon Fibre Reinforced Plastic (CFRP) for the vast majority of external construction. This is even stronger then the steel-framed polymer of the K28, and it is around 40% lighter to minimise the weight of the K29. Although this new design meant that some modularity had to be sacrificed, the K29 is still very flexible with a full length attachment rail running along the top of the weapon. The lower portion of the forend can be switched between Standard, Tactical and Bayonet configurations depending on doctrine, and the barrel can be changed in under a minute. To change the barrel, the operator removes the lower forend and uses the release lever to unlock the barrel. The barrel is unscrewed and removed, with a new barrel being screwed in. It is locked with the lever, and the forend is replaced.

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K29 Automatic Rifle with S11v4 sight and bayonet-compatible forend, Light Woodland pattern.

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K29 Automatic Rifle with S11v4 sight and tactical forend and A198 grip, Night pattern.

The CFRP housing for the weapon provides an excellent opportunity for customisation, and to capitalise on this the K29 is available in a multitude of camouflage options. All forend options, the S11v4 sight and the E901 grenade launcher are all available in the same high-quality digital patterns to maximise the concealability of the rifle in combat conditions. The camouflage options are:
---Generic: Good in all areas where specialist camouflage is not available. Image: http://img262.imageshack.us/img262/921/k2912ix5.png
---Desert: Great for arid and dusty climates, also good for urban, mountainous or snowy conditions. Image: http://img212.imageshack.us/img212/1151/k2919aj5.png
---Grassland: Great for grassy plains, also good for woodland, or tropical areas. Image: http://img241.imageshack.us/img241/5181/k2920hj9.png
---Light Woodland: Great for woodlands, custom made for the Franberran military. Image: http://img258.imageshack.us/img258/1557/k2924yb8.png
---Dark Woodland: Great for woodlands, also good in grasslands or tropical areas. Image: http://img514.imageshack.us/img514/3275/k2918ey1.png
---Night: Great for night-time use in any environment, also good in urban or tropical conditions. Image: http://img142.imageshack.us/img142/6753/k2922rj7.png
---Urban: Great for use in built-up areas, any climate. Also good in desert or mountainous areas. Image: http://img408.imageshack.us/img408/2194/k2917sf3.png
---Urban 2: A custom pattern requested by a private group. Further information is classified. Image: http://img146.imageshack.us/img146/5669/k29knd7.png
---Marine: Ideal for various conditions, based on the famous Doomani camouflage pattern. Image: http://img175.imageshack.us/img175/9325/k2916kc0.png
---Arctic: Ideal for snowy, mountainous and some urban areas. Image: http://img392.imageshack.us/img392/7350/k2921cy1.png

The K29 in standard configuration is compatible with the E901 40mm Grenade Launcher, which is a breach-loading device of conventional design. The launcher clips to a special mount at the front of the rifle, two holes in the bottom of the forend and the trigger guard. This fastening is very secure, and with sighting equipment the E901 is capable of hitting point targets out to 200m. With the tactical forend applied almost any grenade launcher can be mounted, as well as a wide variety of other aftermarket accessories.

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K29 Automatic Rifle with S11v4 sight and E901 40mm Grenade Launcher.

Ammunition

The development of high quality ammunition was crucial to the success of the project, so when Stalwart Inc. brought in the K29 they kept the proprietary 7x50mm CTA round. This round is already in widespread use due to the success of the K28. The key to this round is that it is larger than it needs to be, allowing low-power loadings to be used as standard and then high power rounds for sniper or mounted machine-gun use. This allows extensive commonality in manufacturing, maintenance, sighting and other systems without sacrificing the flexibility of having light and heavy rounds for different purposes.

The K274 and K28 used the medium-weight 8.5g projectiles in the M209 round, with the heavier 10.5g M219 for specialist use. The K29 continues this tradition to utilise the exceptional ballistics of the M209, with a lighter 6.5g bullet planned to be introduced for the K29C carbine where recoil could be seen as an issue. A new M226 round is also in development to use a massive 14g bullet, offering exceptional single-shot performance for snipers or competition shooters.

The rounds used for the K29 are – like in the K274 and K28 before it – Cased Telescopic Ammunition. CTA rounds are shorter and lighter than regular rounds, although a case is still present to extract dirt and heat from the weapon when it fires. The casings of M209, M219 and M235 rounds are made from aluminium for minimum weight and maximum heat absorption. Compared to Doomani 6.7x53mm rounds a soldier can carry 40% more 7x50mm CTA ammunition, and this is 50% more when compared to 7.62x51mm NATO rounds.

Of course, 7x50mm CTA ammunition for use with the K29 can be produced freely by any party as long as the new round is not a direct copy of an existing round.

S11v4 Advanced Combat Sight

The S11v4 Advanced Combat Sight is perhaps the most important part of the system. The main unit is a variable zoom scope with a range of 1-4x. All of these settings are available without a battery, with a simple crosshair providing a high-quality optical device. The capabilities expand rapidly with the inclusion of a lithium-ion battery in the base of the sight, as a red or green dot is projected inside the scope. This can be toggled between a simple 0.5 MOA dot for long range use, a 1 MOA dot with a 40 MOA ring for close-combat use, and a special grenade sight for high-velocity 40mm munitions.

Above the scope is a small polymer window that shows the frontal ninety degrees of a compass, helping the operator to navigate or relay positional information without putting the weapon down or taking their eye off the enemy. This is greatly enhanced by the digital rangefinger, which projects range information to the nearest metre directly into the scope for the operator to view. This device is mounted below the scope and has a limit of two kilometres.

The S11v4 also features an infra-red laser, mounted on the left hand side between the scope and rangefinder. This laser is only visible to personnel wearing night-vision goggles, and is primarily used to assist reflex-aiming and identification in low-light conditions.

The controls for the S11v4 are simple. An On/Off switch toggles the power-requiring aspects of the sight, which will all shut off automatically if the weapon does not move at all for one hour. Two buttons on the back of the sight switch between two presets: 1x zoom with the dot and ring and 3x zoom with the smaller dot. A small switch is used to change between red or green projections, and a slide on the left hand side gives the full range of 1-4x zoom.

The sight with battery weighs a total of 850g, and is built with the sturdy solid materials as the K29 rifle itself

Performance

Although the performance of the K29 is only a marginal improvement over the K28, it achieves this in a much more compact and lightweight form. However, the main attraction of the K29 system is that it takes advantage of the full power of the S11v4 sight, offering the infantryman a superior combat system to almost any opponent on the battlefield. The soldier using this weapon can easily spot and relay the position of the enemy, and engage with first-round-hits from over eight hundred metres. The 7x50mm CTA round remains highly lethal even at extended ranges, and the improved closed/open bolt system using the trigger has already shown itself to be a vital asset to the weapon. This feature alone resulted in a 30% increase in overall accuracy when it was implemented, and it is taken for granted that this innovation will be used on nearly all future Stalwart products.

The K29 will shortly be introduced to various units in the Agrandan military, and although it will not outright replace the K28 it will complement it as a weapon for marksmen and other specialists. The K29 is a perfect match for Special Forces where cost is less of an issue and light, compact, reliable and lethal weapons are required. The K29C compact carbine is ideally suited for clandestine operators, vehicle crews or urban operations, where the fighting will be close range and a compact, manoeuvrable weapon is the best option.

Specifications

Name: K29 Automatic Rifle
Type: All-purpose combat rifle
Operation: Balanced gas operation, rotating bolt
Calibre: 7x50mm CTA
Overall Length: 755mm
Barrel Length: 500mm
Weight (Loaded): 2.8kg (3.5kg)

Effective Range on Point: 850m
Effective Range on Area: 1100m
Rate of Fire: 700 rounds per minute
Muzzle Velocity: 962m/s
Effective Accuracy: 0.90 MOA

Manufacture Cost: $700 NSD (Approx.)
Export Cost: $1500 NSD


Name: K29C Automatic Carbine
Type: All-purpose combat rifle
Operation: Balanced gas operation, rotating bolt
Calibre: 7x50mm CTA
Overall Length: 555mm
Barrel Length: 350mm
Weight (Loaded): 2.3kg (3.0kg)

Effective Range on Point: 650m
Effective Range on Area: 900m
Rate of Fire: 700 rounds per minute
Muzzle Velocity: 879m/s
Effective Accuracy: 1.24 MOA

Manufacture Cost: $700 NSD (Approx.)
Export Cost: $1500 NSD


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I'll be posting this on II as soon as it's had a while for you all to proofread it, so probably 12-24 hours to make sure we catch all the bugs. I know the rifle is a little pricey, but that's because it's at the very top end of the market. The sight currently costs $1750 but I'm considering a cut here.

Crookfur - December 7, 2008 02:32 AM (GMT)
Simply exceptional.

My only beefs would be:

The lack of a mention of what type of gas operation it uses, from the picture I woudl assume short stroke but that wouldn't be idela for a balanced mechanism.

Your light laoding loading does seem a bit iffy (quick note you have the M209 and M219 weight listed as grains instead of grams) that 6.5gram load really wastes the potential of the round as you would likely be getting worse ballsitic performance than 5.56x45mm and the long range acccuracy will really suffer as a result. Personally the rifle would struggle to make 500m with the light load and the carbine would be pressed for more than 300m.

Yanitaria - December 7, 2008 08:12 AM (GMT)
Another note on the rounds, Hurtful Thoughts mentioned something a while ago about low-power loadings not burning evenly, which is an issue that he could tell you more about.

Agrandov - December 7, 2008 11:11 AM (GMT)
QUOTE
The lack of a mention of what type of gas operation it uses, from the picture I woudl assume short stroke but that wouldn't be idela for a balanced mechanism.


Valid point, I'll look into this when I get a minute.

QUOTE
that 6.5gram load really wastes the potential of the round as you would likely be getting worse ballsitic performance than 5.56x45mm and the long range acccuracy will really suffer as a result.


The important number in ballistics is the bullet sectional density ratio. The M209 at 7mm and 8.5g would be higher than 0.230, compared to 0.217 for the 7.62x51mm NATO, 0.214 for the 6.5mm Grendel and 0.174 for the 5.56x45mm NATO (SS109).

The light bullet will have a sectional density ratio between those of the 7.62mm and the 7mm 8.5g, meaning that is still retains velocity better than the 7.62 and far better than the 5.56.

I don't think that the 6.5g (100gr) round is that much of a step down, it is still a margin heavier than all military 5.56 ammunition (which cap at 5.18g as far as I can tell). However, I'm still not convinced that I actually need it. The larger 8.5g should, by it's design, be controllable and will deliver somewhere between 2500 and 3000 joules. This should penetrate all but the best NS body armour comfortably.

I think that I will remove the 6.5g round. Once anything is attached to the K29 it should easily have enough weight to counter the recoil effectively.

QUOTE
mentioned something a while ago about low-power loadings not burning evenly


This is not a problem with CTA ammunition, as instead of a high volume of low power powder (causing uneven burning) for a low power round there can be a smaller volume of better powder. Polymer caps are used where necessary to hold the bullet/powder in place.

To clarify, these rounds aren't really "low power", they are just not extracting the maximum potential of the 7x50mm CTA cartridge. A truly full power round would approach the performance of the .338 Lapua, which is completely unsuitable for use in an assault weapon.

Crookfur - December 7, 2008 11:57 AM (GMT)
Yeah the 8.5g round is right on the sweet spot for the calibre.

my thoughts on the 6.5mm round were a bit confused. Last night i was comparing rough JBM data against manufacturer claims and on doign a proper like for like comparison the 6.5g coems out a lot better than it did. ah the joys of ballistic calculations at 2am...

Agrandov - December 7, 2008 05:43 PM (GMT)
Ammo section reworked a little bit, gas system has been specified. Some camo descriptions changed, and a new one added.

Agrandov - December 7, 2008 07:26 PM (GMT)

Hurtful Thoughts - December 7, 2008 09:36 PM (GMT)
QUOTE (Yanitaria @ Dec 7 2008, 03:12 AM)
Another note on the rounds, Hurtful Thoughts mentioned something a while ago about low-power loadings not burning evenly, which is an issue that he could tell you more about.

This fires caseless ETC, so unlike in your cartdridges, which used precussion primer and loose-fill propellant, it isn't an issue.

Because inconsistant burn-rates would be because of propellant clumping, which is eliminated by use of a solid binder-agent and/or filling the entire case-volume with a less energetic propellant.

This is why pyrodex pellets are so well loved by muzzle-loader shooters compared to loose-fill. Though, like straight-razor users, you'll find 1337 skilled powder-horners out there too (because loose-fill is cheaper, and a 'good' shooter can consistantly ram the powder, thus negating pellets)...

Then there's the fact that ETC pretty much flash-fries the entire propellant to burn evenly...
(Closest thing in the hands of prole muzzleloaders? 209 shotgun primers and tri-nitro-tulerien based propellants)

...

Automatic loading B-P revolver action caseless automatic weapon?
No... just... no... I'm not going to design that...
Maybe a HMG with a recoil-operated reloading-bench in the stock... and a 100 round non-disintigrating belt (loop)...




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