SKU: FY0040074BLK
UPC: 818725012877
MPN: 00-40074-BLK
The Franklin Armory F17-X is a complete upper receiver chambered in .17 Winchester Super Magnum, built for shooters who want rimfire economy with rifle-grade reach. It drops onto any Milspec AR-15 complete lower receiver and ships ready to run, with a 20-round magazine, a 16-inch threaded barrel, and an optic-ready flat top. Pest control and small-game hunting are where this upper earns its keep, sending a flat-shooting .17-caliber bullet downrange with minimal drop. If you already own an AR lower, this is a fast way to add a dedicated varmint setup without buying a second firearm. Browse our other complete uppers to compare calibers.
What separates the F17-X from a standard direct-impingement build is its Osprey Defense slim piston system, which auto-adjusts for suppressed or unsuppressed shooting with no manual changes. The 16-inch barrel carries a 1/2x28 thread pitch and a 1:9 twist, and ships with an Aura muzzle brake out front. A 15-inch proprietary handguard with M-Lok slots and an integrated barrier stop wraps the barrel, giving you accessory mounting room and a positive index against cover. The upper and lower receivers use hard coat anodized aluminum, and the F17 proprietary bolt carrier is matched to the .17 Winchester Super Magnum cartridge. A standard charging handle is included. Overall length runs roughly 28.5 inches, with the assembly weighing 5.6 pounds.
This upper makes sense for anyone working coyotes, prairie dogs, or other pests at range where a centerfire is overkill and a standard rimfire runs out of steam. The flat trajectory and low recoil let you stay on target through follow-up shots, and the suppressor-ready piston keeps things quiet near livestock or housing. Set it up with a magnified optic and you have a capable varmint rig that breaks down to the same lower you already shoot. Pair it with the longer-barreled F17-L upper if you want more velocity, or check our full upper receiver lineup for other build options.
Yes. The F17-X is designed to install on any Milspec AR-15 complete lower receiver. It ships as a complete upper with the F17 proprietary bolt carrier and a standard charging handle, so you only need a compatible lower to assemble a functioning rifle.
It is. The Osprey Defense slim piston system auto-adjusts for both suppressed and unsuppressed shooting with no manual changes, and the 16-inch barrel carries a 1/2x28 thread pitch under the included Aura muzzle brake for mounting a host of muzzle devices and cans.
The F17-X uses a 16-inch threaded barrel with a 1:9 twist, matched to the .17 Winchester Super Magnum cartridge. That combination delivers the flat trajectory and low recoil that make this caliber well suited to pest control and small-game hunting.
It is a rimfire cartridge, so ammunition costs less to feed than a centerfire varmint round, while still offering a flatter trajectory and more reach than standard rimfire options. The 20-round magazine gives you ample capacity for extended sessions in the field.
No. The upper is optic ready with a flat top, so you mount your own red dot or magnified scope. The 15-inch M-Lok handguard provides room for additional accessories and includes an integrated barrier stop.
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Franklin Armory
Franklin Armory