The Heart Of Every Bushmaster M4 Patrolman's. Partnering with Franklin Armory to add their Binary Firing System III to Bushmaster'sall-new rifles. - The BFSIII is a three-position trigger allowing the third position to fire one round on pull and one on release. - Specifications: - Caliber 5.56 NATO (.223 REM) - 16 Barrel with a 1:8 Twist Rate - Overall length: 33-36 - C.A.R Style Handgaurd with A4 Flat Top - Salt Bath Nitrate MPI Bolt Carrier Group - A2 Birdcage Flash Hider 1/2 x 28 - Trigger Positions: Safe- Will not fire Semi- Fires 1 round per pull Binary- Fires 1 round on pull and 1 round on release - Features: - Equipped with a Bushmaster 30 Round Aluminum Magazine - The gas system is carbine length - 6 Position collapsible stock for ease of adjustment and precise fit - B5 Type 23 P-Grip - 7075 Forged A4 Flat top Optics Ready - BFSIII Trigger allows for competition tactical and recreational shooters - Salt Bath Nitrate Barrel