PSA JAKL SBR/Pistol kit300BLK 8.5" upper with buffer tube adapter and F5 ACR-style stock and bolt release paddle. Bought it for an SBR build because it was what was available but now I got a BRN-180 kit.The 1913 adapter for pistol builds runs about $100. Building out a gun as is will make an SBR and require NFA registration.