Foxtrot Mike Products GLOCK Style Complete AR9 Upper Receiver - 9mm - 5.2"

The Foxtrot Mike GLOCK Style Complete AR9 Upper Receiver at 5.2" is built to finish a GLOCK-magazine AR-9 build, pairing a linear blast diffuser with a monolithic handguard design that indexes directly to the flat-top upper receiver.

Features:

• 5.2" barrel chambered in 9mm with linear blast diffuser attached
• Threaded 1/2x36
• 3.75" M-LOK handguard
• Full-length picatinny top rail
• Hardcoat anodized black finish
• Heavy 9mm bolt for reliable cycling with carbine recoil springs
• Mil-Spec charging handle included
• Compatible with Mil-Spec or dedicated 9mm lowers

The monolithic design indexes the handguard to the flat-top upper receiver so it's securely locked in place and won't rotate loose over time, and the heavy 9mm bolt is matched to carbine-weight recoil springs for reliable cycling. Whether you're building a home-defense SBR or a range pistol, this upper gives you a complete, ready-to-run foundation.

Because this 5.2" barrel measures under 16", this complete upper is subject to all NFA rules and regulations — know your local laws before purchasing, and use it only in an AR pistol or a legally registered short-barreled rifle.

Note: Foxtrot Mike's lifetime warranty excludes aluminum-cased ammunition, non-OEM Glock magazines (Magpul, OEM Glock, and ETS are recommended), Spikes Tactical Glock-style lowers, and non-Sylvan magwell adapters — using any of these can void coverage.

Foxtrot Mike builds feature-rich, affordable AR-9 and AR-15 uppers backed by a limited lifetime warranty, using premium materials and modern manufacturing processes throughout.