Geissele Freedom Maritime Reconnaissance 6mm ARC 16" - AR-15 Rifle

When 5.56 runs out of steam, the Geissele Freedom Maritime Reconnaissance 6mm ARC 16" keeps going. Chambered in 6mm ARC, it pushes the AR-15 platform to genuine long-range capability without leaving the familiar lower receiver behind.

A semi-automatic AR-15 rifle chambered in 6mm ARC, the Geissele Freedom Maritime Reconnaissance 6mm ARC 16" combines rifle-length direct impingement operation with standard AR-15 architecture for straightforward reliability.

Ballistic Upgrade Path: 6mm ARC delivers a genuine performance step up from 5.56 in both trajectory and terminal energy — a practical choice for shooters who've found the limits of standard AR-15 cartridges.

Competition Capable: Better long-range ballistics make 6mm ARC competitive in precision rifle formats and PRS-style matches where 5.56 starts falling short beyond 300 yards.

Lower Receiver Reuse: Your existing AR-15 lower receiver works without modification. A caliber-specific upper, BCG, and magazines are all that's needed to step into this performance tier.

Practical Hunting Cartridge: 6mm ARC bridges the gap between .223 and larger hunting cartridges — enough energy for ethical deer harvest at ranges the lighter 5.56 and .223 cartridges can't match.

• Caliber: 6mm ARC
• Barrel Length: 16"
• Barrel Twist: 1:7"
• Gas System: Rifle-Length Direct Impingement
• Handguard: 16" M-Lok Free-Float
• Muzzle Threading: 5/8x24
• Magazine Capacity: 30-Round
• Finish: Type III Hardcoat Anodized
• Origin: Made in the USA

Pairs with standard AR-15 lower receivers using a caliber-matched BCG and 6mm ARC-specific magazines. Standard AR-15 buffer systems and lower parts kits apply.

The upper and lower receivers are constructed from 7075 aluminum with a Type III Hardcoat Anodized finish — a durable combination that resists corrosion and maintains tight tolerances over an extended service life.

Built for shooters who want to push the AR-15 platform to longer distances — competitive shooting, medium game hunting, and precision training are natural roles for 6mm ARC capability.

Geissele Automatics is synonymous with precision — their Super Duty and Freedom Rifle platforms are actively used by U.S. Special Operations units and trusted by professional users worldwide. Made in the USA.