The Franklin Armory F17-L complete upper receiver is chambered in .17 WSM and designed for installation on a mil-spec AR complete lower receiver. It features a 20-inch threaded barrel, an OPS piston system, and a proprietary handguard with an integrated barrier stop and M-Lok compatibility.

Key Specifications

• The upper receiver is chambered in .17 WSM.
• The barrel measures 20 inches and has a 1:9 twist rate.
• The barrel uses a 1/2-28 thread pitch.
• The handguard measures 15 inches and includes an integrated barrier stop.
• The handguard is M-Lok compatible.
• The gas system uses an OPS piston with a low-profile gas block.
• The upper receiver is optic ready.
• The bolt carrier is F17 proprietary, and the charging handle is standard.
• The muzzle device is an Aura model.
• The product includes a 20-round magazine and is intended for a mil-spec AR complete lower receiver.

With its .17 WSM chambering, long threaded barrel, piston-driven operating system, and configurable M-Lok handguard, the F17-L provides a specialized upper-receiver setup for users seeking a clearly defined platform configuration and practical accessory compatibility.