Real Action Paintball is proud to introduce the T68 M4 Firestorm, a select-fire electronic marker that preserves the ergonomics, aesthetics, and balance of the M4 Carbine battle rifle. M4 Carbine around the proven T68 receiver. The Firestorm Trigger Group is an electronic grip frame that preserves the aesthetics of the M4 – no double finger triggers here – while giving you select fire capabilities: true semi-auto, 3 Round Burst, and Full Auto.