Long-stroke, low-pressure gas piston minimizes impact on the bolt for reliable feeding and long bolt life. Causes less carbon build-up on bolt, carrier, and upper receiver than original gas impingement system, further reducing wear and shortening cleanup time. Easily installs on AR-15/M16 rifles with carbine-length gas systems using the existing A2 sight tower/gas block or an aftermarket steel gas block. Requires no permanent alterations to barrel or upper receiver. Included shims allow installation on .640", .850", or .875" O.D. barrels. Piston spring is rated for 1,000,000 compression cycles. Complete kit includes a dedicated, one-piece bolt carrier specifically designed for gas piston operation. Carrier Lug kit lets you retain your rifle’s factory carrier by replacing only the gas key with a lug for piston operation. Dedicated, one-piece Carrier also available separately.
SPECS:
Piston/Cylinder – S-7 steel, nickel finish. Cylinder Block – 4140 steel, nickel finish. Bolt Carrier - S-7 steel, matte black finish. Gas Port Insert – stainless steel, natural finish. Handguard – Reinforced polymer composite, black. Fits rifles with carbine-length gas system and .640", .850", or .875" O.D. barrel, measured 1½" behind the front sight. Instructions included.
Catalog page 15