AR-15 Barrel Extension

Features

1. MIL-SPEC AR-15 Compatibility — Machined to military specifications so it threads onto standard AR-15, M4, and M16 barrels and indexes correctly to mil-spec upper receivers.
2. Eight Locking Lugs — Precision-cut bolt locking lug recesses give the bolt a full mil-spec lockup for safe, repeatable headspacing.
3. M4 Feed Ramps — Extended M4-style feed ramps cut into the extension for smoother, more reliable feeding with full-auto and semi-auto bolt carrier groups.
4. Hardened Steel Construction — Machined from carburized, heat-treated ordnance steel to handle repeated bolt lockup, high round counts, and sustained fire without peening.
5. Indexing Pin Hole — Pre-drilled alignment pin hole keeps the gas port and bolt lug recesses properly oriented during barrel installation.
6. 5.56/.223 Bore Profile — Sized for 5.56 NATO and .223 Remington AR-15 barrels with a standard 1.0" outer diameter that drops into any mil-spec upper.
7. Barrel Builder Replacement Part — Ideal for gunsmiths and home builders assembling a new AR-15 barrel from a blank or replacing a damaged extension.
8. Phosphate Finish — Manganese phosphate coating resists corrosion and stands up to the heat and pressure cycles at the chamber end of the barrel.