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PTS Mega Arms Licensed MKM AR15 GBBR LM4 Airsoft Gas Blowback Rifle

SKU: AEX-MG002680307 PTS SyndicateOut of stock

  • - Officially licensed by Mega Arms
  • - Force velocity gas blowback system
  • - PTS Mega Arms GTR-3H Billet lower receiver
  • - PTS Mega Arms MKM AR-15 Billet upper receiver
  • - Integrated KeyMod free-float handguard
  • - 18-inch monolithic top rail
  • - Functional bolt catch and release
  • - Functional forward assist
  • - PTS Mega Arms skeleton trigger
  • - Adjustable hop-up unit
  • - Black hard anodized finish
  • - Realistic construction & field stripping


PTS Mega Arms Licensed MKM AR15 GBBR LM4 Airsoft Gas Blowback Rifle

Military simulation calls for an airsoft rifle that performs at its peak. But it also entails a rifle that mirrors the most minute detail down to its core. Enter the MKM AR15, a gas blowback rifle the uses the Force Velocity gas system that delivers commanding muzzle velocity paired with realistic blowback action. This is the same system that KWA employs in the AKG-74M, LM4 GBBR and its coveted KRISS Vector. Constructed out of hard anodized metal, this rifle system is far beyond an ordinary M4. Notably, the rifle’s outer body boasts officially licensed PTS furniture, including a Mega Arms MKM AR-15 billet upper receiver. A GTR-3H lower receiver also comes pre-installed, which features Mega Arms’ official logo etched on the side. But the rifle’s main highlight falls toward the aluminum free-float handguard. Aside from being slim and sleek — allowing for a firm and secure grip — the KeyMod handguard can turn this streamlined rifle into a modular weapon system. Aftermarket Picatinny rail sections can quickly attach onto the MKM AR15 within seconds. While the front and rear sights come in handy for most engagements, aftermarket rifle scopes assist in taking down targets in outdoor games. This is thanks to the rifle’s 18-inch monolithic top rail. In addition to all the key features mentioned, this gas rifle also sports a replica gas block, enlarged trigger guard and PTS skeleton trigger.

Ammo type: Seamless 0.20g or heavier (0.23g, 0.25g, 0.26g, 0.28g, etc) BBs. For maximum performance and accuracy, Airsoft Megastore recommends GoldenBall ProSlick BBs which carry perfect spherical consistency and density, available at Airsoft Megastore for the lowest price on the market, guaranteed.

In the Box

Gas blowback rifle

GBBR magazine

speed loader

elevation adjustment dial tool

barrel cover

instruction manual


Operation Gas Blowback
Build Metal Upper & Lower Receiver, Handguard, Rail, Sights, Outer Barrel, Buffer Tube, Flash Hider / Polymer Stock, Pistol Grip
Firing Modes Semi-automatic and Full-automatic, w/ Functional Saffety
Muzzle Velocity 360 – 380 FPS (w/ 0.20g BBs)
Magazine 40rd Gas Blowback
Propellant Green Gas
Hop-Up Adjustable
Inner Barrel 370 mm
Inner Barrel Diameter 6.05 mm
Weight 7.5 pounds
Overall Length 31.6" in. / 35" in. (Retracted / Extended)

California Proposition 65 Warning: Cancer and Reproductive Harm -

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