The AR15 was originally designed as part of the U.S. military’s initiative to develop a lighter smaller caliber weapon as the standard infantry rifle.  This innovative weapon utilized aircraft technology to lighten the rifle’s overall weight.  This led to the creation of the M16 which has served as the backbone of the U.S. Military for more than 40 years. Since its inception shorter variations of the M16 were developed for the US Special Forces and other branches of the military, such as the M4A1.

The KWA LM4C Professional Training Rifle is an ATF approved gas blowback AR style rifle available in the United States.  It features a new hop up system that was developed for the LM4 to improve range performance on the field.  An aluminum alloy receiver houses the full steel reinforced bolt carrier for strong reliable feedback.  The LM4C PTR buffer tube has the same diameter of a MilSpec Butt Stock which allows operators to customize to their weapon configuration.  In addition, the lower receiver can accept aftermarket AR15 pistol grips and trigger guards.  Other details such as the operational forward assist and bolt catch feature provides the user unparalleled realism by mimicking fundamental AR15 weapon manipulation. Similar to real AR15 style rifles the LM4C PTR’s modular design allows limitless customization options to best suit the individual’s training needs.

KWA Green Gas Performance Test


Assumption: Test how many shots a single KWA Green Gas can provide. Average number of shots in a 12 Oz Green Gas can is 500-1000.

Ambient Temperature: 78 Degrees Fahrenheit

Guns Tested: 1 LM4C, 1 AK KCR


LM4C GBB Rifle: 1x green gas + 4 LM4 Magazines
AKG-KCR: 1x green gas can + 5 AKG Magazines

Gas Capacity: filled each magazine for 30-seconds
Magazine Capacity: filled to max capacity of 40 rounds.


Test Fire: Kept reloading magazines with BBs until all gas was consumed. Process repeated until gas can was empty & could not achieve a 30-second fill. Magazines were cool to the touch after gas was empty and refilled without warming time.
LM4C GBB Rifle: 920 total rounds
AKG-KCR: 840 total rounds

Green Gas/GBB Videos


To get optimal performance and increase efficiency out of your GBB magazines, you should prime the magazine before charging. Watch the video to learn how.


Watch as our friends at Sniper (Germany, KWA Authorized Dealer) put the KWA LM4 & ATP through freezing conditions.

Weight 8.3 lbs
Dimensions 32.5 × 12.5 × 4 in

Common Maintenance Parts

Part # SKU Description
2 199-3001-0002 LM4 Bolt
60 199-3001-0060 LM4 Bolt Base
62 199-9999-D081 LM4 Bolt Base Return Spring
190 199-9999-E022 LM4 Bolt Base O Ring Small
191 199-3001-0191 LM4 Bolt Base O Ring Large
236 199-3001-MG236 LM4 Magazine Nozzle Seal
240,246 199-9999-I037 LM4 Release Valve
245 199-9999-I008 LM4 Charging Valve
230 199-3001-MG230 LM4 Magazine Lip