Dimitriy Popov of airKGB, the airsoft YouTube Channel that has a very fine intro clip, makes an upgrade and goes for the KWA MKM LM4 Gas Blowback Rifle... "The already spectacular KWA LM4 has come back again with yet an even more aesthetically pleasing package. Partnering with PTS the KWA MKM LM4 is fully licensed by Mega Arms featuring their MKM rail system on a LM4 carbine gas blowback platform.

AirKGB has this short video demonstration of the Wolversion Airsoft SMP Version 2 (for version 2 gearboxes) done at an indoor range... "Range demo of the Wolverine Airsoft SMP Ver.2 HPA system fitted in a Classic Army LWRC 6.8mm SPC by Big Boy Toys. It has a staggering performance of 425 fps with .25g bb and a ROF of 2000 rpm."