King Arms A1 Paratrooper Carbine Rifle

The Real Paratrooper Carbines

The M1A1 and M2A1 Paratrooper Carbines can both be seen as early predecessors to the modern PDW, purpose-built to provide airborne troops and second-line personnel with a lightweight, compact firearm that offered far greater practicality than a standard sidearm.

Designed for paratroopers, support units, officers, and rear-echelon troops, these carbines delivered a substantial improvement over the M1911 pistol, extending effective defensive capability from roughly 25 metres with a handgun to around 100 metres or more with a shoulder-fired weapon. Their folding stock design made them especially suited for airborne operations, allowing troops to carry a more capable firearm without sacrificing portability during jumps or transport.

The M1A1 Paratrooper variant retained the semi-automatic fire of the standard M1 Carbine while introducing its iconic side-folding stock, giving airborne soldiers a highly mobile weapon ideal for rapid deployment and close-to-medium-range engagements. The later M2A1 built upon this concept by incorporating selective fire capability and larger-capacity magazines, significantly boosting close-quarters firepower.

While some troops criticised the M2A1 for reduced effectiveness at longer ranges, these concerns were often linked more to excessive ammunition expenditure during full-auto fire rather than any inherent weakness in the platform itself. In semi-automatic use, both the M1A1 and M2A1 remained effective, practical carbines that excelled in their intended role as compact defensive weapons for highly mobile troops.

The King Arms A1 Paratrooper Rifle

King Arms has done a fantastic job with their A1 Paratrooper Carbine, both in its visual accuracy to the real deal and in its impressive performance and exciting, fully functional blowback action. This Paratrooper Carbine replica is constructed almost entirely from aluminium, steel and real wood. It feels absolutely fantastic to hold, imitating the real Carbine's remarkably low weight and superb handling faithfully.

Starting at the tip of the outer barrel, we can find that there are no threads, so uncivilised CQB skirmishers cannot ruin this historical piece with a tracer unit. Thank goodness! Next up, we come to the front sight, which is protected on either side with protective wings with a circular cut-out to let more light in.

The front sight itself is a fine blade-style sight which aligns perfectly with the adjustable rear sight at the back of the receiver. The sight picture on the Paratrooper Carbine is very effective, similar to an M14 or M1 Garand, offering a very precise adjustable aperture at the rear, which lends itself perfectly to accurate semi-automatic fire.

Next up, we reach the bayonet lug, which was actually a late-war addition to the original M1 Carbine based on requests received from troops in the field. The real A1 Paratrooper Carbine mounted the M4 bayonet, which was based on the M3 fighting knife originally issued with the bayonet lug-less original early war M1 Carbine. We don't have an M4 bayonet to test this out, so we can't confirm whether the lug is functional, but it is nonetheless a great addition to the impressive realism of this A1 Paratrooper replica.

Moving rearwards, we arrive at the front barrel band and sling swivel, both of which are constructed from steel for extra strength and flexibility over alloy. This part has an authentic gun metal grey finish, which adds some subtle contrast to the overall look of the Carbine and makes it that bit more real-looking.

The sling swivel is designed to be used in conjunction with a two-point sling, which pairs with the unconventional sling point found on the bottom of the pistol grip, which has been designed in a way to not interfere with the side folding mechanism of the skeletonised stock.

Following the front barrel band, we come to the stock of the Carbine, which is known as the late war "pot belly" stock, which has a wider and more ergonomic front end and was added to M1 Carbines during wartime production to increase the strength of the stock and make it more comfortable to hold, and it stuck around for the M2 models. This stock shape is what gives the Carbine its iconic silhouette and is a big part of what makes it so recognisable.

As previously mentioned, the handguard/heatshield is constructed from real wood, and the finish is absolutely flawless. You would be hard-pressed to find a real A1 Paratrooper Carbine that looks this fresh today, but this is how they must have looked coming out of the Inland/General Motors factory during WWII, and it looks great. If you want to make this carbine scruffy for a well-used look, you can, but we are glad King Arms didn't make this the default!

The upper portion of the stock, known as the handguard or heatshield, has a groove running down the centre to allow for the front and rear sights to align. The geometry of this groove matches well with A1 Paratrooper Carbines, tying the whole piece together with authentic, historically accurate details. The handguard also makes a nice place to brace the thumb when shooting, almost like a modern C-clamp grip, and makes the Paratrooper Carbine a pleasure to shoot and manipulate.

Over on the right side of the stock/handguard, we can see a cut-out just before the receiver. This cut-out is for the Paratrooper Carbine's charging handle to protrude through in a similar manner to an M1 Garand. There are no common parts between the A1 Carbines and the M1 Garand, though the former was based on a budding replacement for the M1 Garand, the Winchester M2, and had similar controls to make it more familiar to G.I.s who were primarily using M1 Garands prior to the Carbine.

The receiver of the Paratrooper Carbine is constructed entirely from aluminium, as is the bolt and charging handle. This makes for an incredibly satisfying action noise when the Carbine is fired in typical gas blowback style. With each shot, the charging handle and bolt reciprocate to load the next round, with some violent yet not over-the-top recoil, just like the real Carbine.

What is even cooler is that the bolt of the King Arms A1 Paratrooper Carbine rotates slightly when the charging handle is pulled back or cycles from firing, appropriately imitating the rotating bolt action of the real Carbine. This is a lovely touch for realism, and little details like this show that King Arms had the right idea when designing this Carbine, focusing on realism and historical accuracy in their builds.

The charging handle is located on the right side of the Carbine. On the M2A1 only, the fire selector is on the left (rearwards for semi, forward for full auto), and the other controls surround the trigger guard, making this old-school rifle slightly more modern in handling than one might assume.

The safety is the late-war rotary safety design, and is located on the right side of the trigger guard and is easily reached from a firing grip. The magazine release is located just forward of the safety and is a push-button design which works similarly to an M4/AR15. When the magazine release is pressed, the mag will drop free, and it is rather heavy, so make sure you get a hand on it and don't let it fall!

While the Carbine does not have a last-round bolt hold open feature, there is the ability to manually lock the bolt to the rear to clear jams and inspect the chamber built into the charging handle itself. To lock the bolt to the rear, you will need to pull the bolt back to its rearmost position, hold the small protruding button on the top of the charging handle, and gently release the bolt with the button held down, and it should lock into place. 

To release the bolt again, simply power stroke the charging handle (pull it back) and the bolt will fly forward into the breech. This is another feature which is a perfect replica of the real Carbine's functionality. Reenactors and history buffs alike will love this A1 Paratooper Carbine!

Being able to lock the bolt back also makes accessing the HOP-up adjuster far easier. The adjuster is located above the chamber and is accessible when the charging handle is locked or held back. This is the "grub key" style of adjuster and requires a small Allen key to adjust, though it has the benefit of being able to hold its setting for far longer under the recoil of a GBBR action, which should make this Carbine quite the potent primary at longer ranges.

The rear sight is located at the top rear of the receiver and is a fine aperture sight with adjustability for windage built into the sight base. To adjust windage, simply turn the knurled knob at the right side of the sight, and you can move the sight aperture either left or right. The windage adjustment knob turns with audible and tactile clicks, and just beneath the rear aperture, you can see engraved markings which allow you to keep track of your adjustments, and find the central position again with ease.

Moving on to the stock, it is a side-folding skeletonised stock constructed from steel. It is formed from two steel bars that wrap around and connect to the butt plate, which has a side folding mechanism of its own so it can be folded away more compactly.

This design closely mirrors the real-steel A1 Paratrooper Carbine, the variant specifically issued to paratroopers. Its defining feature was the ability to remain extremely compact during transport while still offering a fully usable stock once deployed. This balance was crucial for airborne troops, allowing them to jump, move, and manoeuvre efficiently, then quickly bring the weapon into action with proper stability and control once on the ground.

So, whether you run an old-school re-enactment loadout from the very end of WWII, the Korean War or the Vietnam War, the A1 Paratrooper Carbine would make a fine primary weapon, boasting perfectly faithful late-war Carbine externals, beautiful real wood furniture and the authentic and immersive blowback experience of a gas blowback. Even if you run a modern loadout, this rifle would look great with a rebel-style kit or a sci-fi, Fallout-themed setup.

Features

• Full metal construction - Mostly wood on this replica, steel stock
• Beautiful real wood furniture - Looks and feels incredible
• 2.16KG - Extremely lightweight, perfect for agile skirmishers
• 17-inch barrel - Great accuracy potential
• M2A1 Only - Semi and full auto fire modes, perfect for everything!
• Aperture iron sights - Adjustable for windage via the rear sight
• Trigger/Action lock rotary safety - The rifle cannot be cocked with the safety on
• Fire selector/lever on the left side of the bolt - Select between full or semi-auto
• Sling slot on the handguard and pistol grip - Perfect match to the real M2A1
• Steel skeletonised side folding stock - Durable, making the replica more compact when travelling
• Grub key adjustable HOP-up - Located inside the action, above the barrel
• Push button magazine release - Well within reach of the trigger finger in a firing grip
• Bayonet lug included - Real-world accurate for late production M2A1 Carbines
• Round bolt upper surface - Real-world accurate for M2 Carbines

Package Includes

• King Arms A1 Paratrooper Carbine Rifle
  • M2A1 Variant - 35rnd Green Gas Magazine
  • M1A1 Variant - 15rnd CO2 Magazine