- Threaded for your 5.56mm carbine.
- Machined from 4150 steel.
- Phosphate coated per MIL-STD-171.
- Predrilled hole at the base for permanent installation.
When mounted per BATF specifications for a permanent installation it will bring your 14.5" M4 barrel to a non-NFA length of over 16.1". Installation should be done by a qualified gunsmith familiar with BATFE regulations. The A2X is predrilled and comes with a dowel pin and crush washer for installation.