The Franklin Armory F17-L Complete Upper Receiver (brand part no. 0040072BLK) comes with everything you need to drop onto a mil-spec AR complete lower receiver. Chambered in the amazing .17 Winchester Super Magnum, this piston-driven upper delivers a cleaner, flatter-shooting solution for pest control and small-game work. The F17-L uses a new Osprey Defense slim piston system that automatically adjusts for suppressed or unsuppressed use with no manual adjustment needed, pairing perfectly with the included 20″ barrel threaded in the common ½-28 pitch for use with compatible suppressors.

Key Specifications

• Chambered in .17 WSM for a flat-shooting, low-recoil pest control setup.
• Features a 20″ barrel threaded ½-28, ready for compatible suppressors.
• Uses an Osprey Defense slim piston system that auto-adjusts for suppressed or unsuppressed fire.
• Handguard measures 15″ with an integrated barrier stop and indexing point, and is M-LOK compatible.
• Rifling twist rate of 1:9 is matched to .17 WSM projectiles.
• Ships optic-ready with no iron sights included.
• Uses a proprietary F17 bolt carrier matched to the piston system.
• Gas block is a low-profile design for a clean handguard silhouette.
• Includes the Franklin Armory Aura muzzle device.
• Finished in black, with an overall length of 36.6″ and a weight of 6.3 lb.

Frequently Asked Questions

Does this upper work with a suppressor? Yes, the 20″ barrel is threaded ½-28, and the Osprey Defense piston system automatically adjusts for suppressed or unsuppressed use with no manual tuning.

What caliber is this upper chambered in? It’s chambered in .17 WSM for flat-shooting pest control and small-game work.

Does it come with sights? No, it ships optic-ready with no iron sights included.

Buy the Franklin Armory F17-L Complete Upper Receiver

Build a flat-shooting .17 WSM AR with this upper from Franklin Armory. Browse more AR15 uppers and order from our Lubbock, Texas gun shop for fast, insured FFL shipping.