At SHOT Show in 2022, Ohio Ordnance Works teased their new .338 light weight medium machine gun, keeping the gun’s key features hidden under strategically placed scrim. This year the REAPR was unveiled for all to see. The REAPR or Recoil Enhanced Automatic Rifle is chambered in .338 Norma Magnum and can also be calibre converted to 7.62x51mm.

The gun was developed by Ohio Ordnance Works (OOW) in response to solicitations from the US SOCOM and US Marine Corps for a Lightweight Medium Machine Gun in .338NM. The niche requirement for a .338 gun dates back to at least 2012 with the first Sources Sought Solicitation being launched in May 2017. The solicitation requested:

“The LWMMG should fire the belted .338NM round of ammunition with a polymer case. The LWMMG should weigh less than 24 pounds unloaded with a barrel length of 24in. The LWMMG should have a rate of fire of between 500-600 rounds per minute. Weapon shall be compatible with current rail mounted aiming systems with the ability to incorporate more advanced fire control technology. The system should include both a suppressed barrel and an unsuppressed barrel that can be rapidly changed. The LWMMG should include a tripod that is lightweight and provides the stability and accuracy required to engage targets at extreme ranges. The LWMMG should be able to mount in current machine gun mounts designed for the M240B/C. The weapon should have sufficient accuracy to engage area targets and vehicles at 2,000m.“

General Dynamics led the field developing their .338 machine gun but this design was later divested to True Velocity and since then SIG Sauer have also developed their MG338/SL MAG. The 2017 solicitation is now inactive, however, in 2021 SOCOM (via PEO SOF Warrior, PM Lethality) began seeking an ‘LMG-M’. LMG-M project seeks a gun that can engage targets out to 2,500m and has a similar weight and form factor to an M240B. A contract had been hoped to be awarded by the end of 2022, however, this slipped back to 2025 and now likely 2026.

The aim of .338 machine guns is to fill the gap between the 7.62mm GPMG and the .50 HMG while providing a dismounted, lighter weight platform that can give the performance of a .50 calibre machine gun.

OOW began work on their gun in 2020 with numerous patents granted on its features. The REAPR is a select-fire weapon with ambidextrous controls on either side of the pistol grip assembly as well as a traditional cross-bolt safety. The pistol grip itself can be swapped out for any AR-15/M16 compatible grip. Robert W. Landies, OOW’s president and one of the designers of the gun, told me that with REAPR they addressed a lot of the pet peeves they had with legacy machine guns designs and that they “took a lot of features and amalgamated the best of them” when designing the weapon. Intriguingly, the gun uses a roller delayed operating system, similar to that of the MG45, this means the opening of the action is slowed by rollers but does not fully lock. Post-Second World War Two this system had some influence on a range of designs including the SIG MG 710-3 and a host of Heckler & Koch weapons. The gun uses a pair of springs on dual guide rods and has a 600 rpm rate of fire. The weapon can be field stripped without tools. To remove the action a pin at the rear is removed which allows the butt stock and rear of the receiver to be removed with the springs, guide rods and bolt sliding out of the receiver.

It has a side folding stock, designed in house with B5, with a shoulder rest and an adjustable cheek riser. B5 also provided the REAPR’s P23 Grip and MLOK rail covers. According to OOW the REAPR weighs in a 26.8lbs and has an overall length of 51.7in (131cm) when the stock is collapsed, 54.5in (138cm) when deployed and 44in (112cm) when folded (it can fold either to the left or right). For use when mounted on vehicles or aircraft the stock can be removed and a spade grip kit can be fitted. There is also a rail mounted removeable carrying handle.

A key feature is the gun’s barrel quick change system, this can be done with one hand by the operator. The change can also be done with the bolt either in the forward or rear position. The patented system uses 2 opposing groups of 5 interrupted threads, this allows the barrel to be released with just a 90-degree turn. To remove the barrel the operator grasps the barrel cover, pushes the barrel rearward, towards the receiver, and then turns the barrel 90-degrees to disengage it. The REAPR can be mounted with a suppressor, it has been seen paired with cans from a number of different manufacturers.

Another feature is that the entire system can be broken down into 3 pieces within 10-20 seconds. It can be packed away with the barrel at 24.5in (61cm) being the longest component. The REAPR has a one-piece steel receiver and an aluminium hand guard with MLOK slots, which can be removed via a pair of catches. The gun also has MIL-standard mounting points for either tripod or pintle mounting. Another key, patented, feature is the gun’s feed tray which can slide out to the side of the gun for loading and clearing, this allows the operator to use optics with a larger continuous footprint. SIG Sauer addressed this issue by having a cover which hinges to the side. The REAPR’s direction of feed can be flipped either left or right and ejection is through the bottom of the receiver. OOW note that the gun has a mounting interface for an ammunition pouch on the left side of the receiver but are considering adding one to the right side but are waiting on feedback from users.

OOW say that the REAPR is currently available for ordering in test quantities but full volume production is set to begin in April 2024. The REAPR seems to be a very competent, well thought out design with a lot of promise. It will be interesting to see how the LMG-M programme progresses.

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Bibliography:

‘Firearm top cover with multiple degrees of freedom of motion’, US Patent #11268774B1, (source)

‘Quick-change barrel for a firearm’, US Patent #11598600B2, (source)

[FULL BREAKDOWN] Ohio Ordnance REAPR .338 NM Belt-Fed Machine Gun, OOW, (source)

Lightweight Medium Machinegun (LWMMG), SAM.gov, (source)

USSOCOM Small Arms Update 2021, SSD, (source)

SOFIC 22 – USSOCOM Weapons Update, SSD, (source)

SOF Week 23 – USSOCOM Weapons Update, SSD, (source)

Full Circle: A Treatise on Roller Locking, R. Blake Stevens (2006)