A complete review of the lightweight Rossi M249 Support Airsoft machine gun by Mecanica 6mm. Out of the box, it chronos at about 368 FPS with an 11 RPS rate of fire. They point out its primary feature: a high-resistance polymer body that makes it significantly lighter than full-metal support guns.

An internal breakdown revealed a Version 2 gearbox with a desirable metal-toothed piston, but lacked a MOSFET and structural reinforcement. After internal tuning, performance improved to 370 FPS and 13.7 RPS. Following a successful field test, they end by recommending a 7.4V LiPo or 9.9V LiFe battery to ensure optimal performance and long-term durability.