OPS INC 3 Piece Collar For Allen Engineering M4 Suppressers W/ Blank Sleeve

The OPS INC™ 3 piece collar, often referred to as the Gordon Collar, was designed originally for use with the issued M4 rifles of the 90s. It allowed the M4 suppressor to be installed on a 14.5″ barrel with carbine gas system. The clearance cuts on the bottom allow it to be used with an FSB and clear the bayonet lug, however an FSB is not required for use. The 3 piece M4 collar has since become an iconic part of many clone rifles of the era. You can learn more about historic builds here. The 3 piece collar consists of an inner stainless steel sleeve and 2 outer anodized aluminum clamps. The sleeve is precisely fitted to the barrel and seats against the front of the gas block journal. The outer collar clamps tighten down to keep the assembly from moving. Weight: 2.4oz (w/ “blank” sleeve) Construction: Stainless steel sleeve, black oxide finish. 6061 aluminum clamps, type III hardcoat anodize. 8-32x.75″ Grade 8 cap screws with 9/64 hex drive. For sleeves, most people choose the “blank” which allows it to be fitted to your specific barrel by a gunsmith. This will be the best option for most people due to varying barrel dimensions.

Weight	.15 lbs
Dimensions	1.5 × 1.5 × .9 in
Manufacturer	Allen Engineering
Model	AR-15