The Faxon ARAK-21 is a versatile AR-15 compatible upper receiver featuring a long-stroke piston system for enhanced reliability. Its standout feature is a quick-change barrel system allowing easy caliber swaps between 5.56 NATO, .300 Blackout, and 7.62x39mm. The system also includes an innovative Muz-Lok muzzle device system and a prototype backstrap safety.
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