A Varmint-Ready Upper Receiver for Your AR-15
One of the most unique AR-15 upper receivers on the market is the Franklin Armory F17-VS4, which is chambered in the lightning-fast .17 WSM. Due to the unique needs of this rimfire round, these receivers are built with a few extra features that ensure trouble-free performance, giving varmint and predator hunters a great enhancement for their ARs.
Each Franklin Armory F17 upper receiver is built with a gas-piston operating system, which is paired with a 4140 chrome-moly barrel complete with a salt-bath nitrided bore, chamber and external finish. This upper receiver is outfitted with a 20-inch bull barrel, which is finished with an 11-degree target crown and a recessed muzzle to enhance accuracy and precision.
Other features found on the Franklin Armory F17 upper receiver include a forged A4-style upper made from 7075-T6 aluminum and treated with a black-anodized finish. The gun comes with a full Picatinny optics rail, as well as a forward assist that allows shooters to ensure their gun gets into battery. This upper receiver requires an A2-style buffer tube and spring to run reliably. The company also warns that some aftermarket triggers may not provide the strength necessary for reliable ignition.