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 1:9 Twist Rate – Overal length: 32.5 – 36″  – M4 Style Handgaurd with Detachable Carry Handle – 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 -7075 Forged A4 Flat top, with detachable carry handle – F-Marked sight base for sight slightment, providing correct carbine  -BFSIII® Trigger allows for competition, tactitcal and recreational shooters   Warning: Not for civilian sales in CA, DC, IA, NJ, NY, HI, WA, RI, FL, MD or CT.