Description – ABACN (Castle Nut)
Mil-Spec Castle Nut secures the buffer tube/receiver extension to the MOD*X chassis, AR15, and AR10 platforms.
- Phosphate coated
- You know what it is
- You know what it does
- You know you want one
AR-15 Carbine Extension Tube Castle Nut
$6.99
The A*B Arms Receiver Extension is an aluminum buffer tube used as an accessory for AR15s, as well as the various MOD*X chassis receivers and butt stock adapters.
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