<p>FRANKLIN ARMORY SPR Franklin Armory 4159 F17 SPR 17 WSM 18″ 4140 Chrome Moly Steel Black Hard Coat Anodized Brl Finish Franklin Armory’s F17 SPR upper is constructed of forged 7075-T6 aluminum with a hard coat type III anodized black finish. It features a TML-12 free float and knurled handguard and a custom designed 17 WSM bolt carrier.</p>