KAK INDUSTRY BLAST CONVERTER FOR BARRELS 10.5 AND LONGER PATENTED DESIGN STEEL CONSTRUCTION HARDENED MELONITE FINISHED SLEEVE SEALED WITH A PISTON RING FOR NO BLOWBACK 1.350 DIAMETER 1.750 LONG CRUSH WASHER IS INCLUDED MODES OF OPERATION 1 - LINEAR COMP, GAS IS DIRECTED FORWARD AWAY FROM SHOOTER 2 - HALF COMP, GAS IS DIRECTED UP AND AWAY FROM SHOOTER 3 - FULL COMP, GAS IS DIRECTED OUTWARD 360 DEGREES GIVING MAX BRAKE AVAILABLE IN A VARIETY OF THREAD PITCHES AND BORE SIZES, MADE SURE TO ORDER THE CORRECT ONE FOR YOUR APPLICATION