Franklin Armory F17-L Upper Receiver Kit .17 WSM 20"
Complete piston-driven upper receiver in .17 Winchester Super Magnum with 20" threaded barrel, Osprey Defense slim piston system, and M-Lok handguard. Ready for AR-15 lower receivers.
Fits: AR-15
Franklin Armory F17-L Upper Receiver Kit
The Franklin Armory F17-L represents a thoughtful approach to modern pest control and small-game hunting. This complete upper receiver assembly arrives ready to mate with any standard AR-15 Milspec lower receiver, making it an accessible platform for shooters seeking a specialized caliber without building from scratch.
Key Features
Caliber & Barrel
- Chambered in .17 Winchester Super Magnum, a flat-shooting cartridge designed for precision at distance
- 20" barrel with 1:9 twist rate optimized for .17 WSM ballistics
- Threaded muzzle (½-28 pitch) accepts standard suppressors and muzzle devices
Gas System Innovation
- Osprey Defense slim piston system automatically adjusts for suppressed or unsuppressed fire
- No manual adjustments required—the system adapts to your setup
- Cleaner operation with less fouling compared to direct impingement designs
Ergonomics & Modularity
- 15" integrated handguard with M-Lok slots for accessories
- Integrated barrier stop provides consistent indexing point
- Optic-ready upper receiver for modern sight systems
- Standard charging handle
- Proprietary F17 bolt carrier group
Why Choose the F17-L
The .17 Winchester Super Magnum delivers exceptional velocity and a flat trajectory, making it ideal for varmint control and precision shooting. The piston-driven system keeps the receiver cleaner than traditional designs, reducing maintenance while improving reliability. Whether you're managing pest populations or enjoying target shooting, this upper receiver delivers accuracy and ease of use.
