The uppers feature a mid-length FSB gas system with a Magpul drop in hanguard, Magpul flip up rear sight, front sling swivel, bayonet lug, and a unique A2 style flash hider. CMV 1/8 Twist 5.56 NATO Barrel, T marked, S&W branded Picatinny rail upper receiver with a milspec charging handle and AR-15 profile BCG (semi auto). Bores are excellent. As with all trade ins these uppers are used, they will exhibit minor cosmetic wear, chipping, scratches, and minor finish loss in some areas. May or may not come with a Magpul MOE vertical grip and additional M-Lok Picatinny rail sections. These uppers are Good to Excellent. The images are representative of what you may receive but are not necessarily the exact upper you will receive. All has passed fitment and functions tests. Sold as is, no warranty implied or otherwise.