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References in periodicals archive ?
On receiving the Revolution DI for testing, I separated the upper and lower receivers and removed the bolt carrier group for inspection.
Each kit features the triangular handguard, teardrop forward assist and Colt "C" markings on the bolt carrier group. Colt markings also on trigger, hammer, bolt catch and A-frame forward sight.
How about a 14.5" Daniel Defense hammer-forged barrel (1:7) and Colt's M4 upper receiver and M4 mil-spec bolt carrier group. Then there's a Geissele Airborne charging handle, Geissele Super Modular Rail, MK16, 13-5" SureFire SF4P flash hider, Geissele gas block (pinned) and a mid-length gas port location.
Riding inside is a high nickel-phosphate-coated bolt carrier group that includes POF-USA's patented roller cam pin.
The system uses a bolt that is forced to rotate and unlock, slowing the bolt carrier group enough to safely cycle.
I'm using one in conjunction with a Sharps Rifle Company (, 877/256-4794) Balanced Bolt Carrier Group. It has a slightly larger rear diameter compared to mil-spec, gives consistent travel and wear when reciprocating and corrects tilt well.
It has a 7.5" barrel with a 1:7 twist made of 416R stainless steel; the Ml 6 bolt carrier group is of Carpenter 158 steel, both are finished in Melonite.
The bolt carrier group is Nickel Boron, the barrel is nitride treated, the buffer tube is polished and the trigger is finely tuned.
Colt[R] "C" markings can be found on upper receiver, bolt carrier group, A-frame post and magazine.
The bolt carrier group is full-weight with a M16 cut.
It includes everything you need to build up an AR pistol with a 10" barrel except the lower receiver and a bolt carrier group (which'll set you back another C-note).