This is our standard TG36KER Rifle, 16.5" 1 in 7 twist rate nitride barrel threaded in the standard 1/2 x 28 thread pitch, with DeadAir Keymo Flash Hider. Comes with the aluminum B&T; top rail set up with adjustable emergency back up sights, The aluminum B&T; hand gaurd, IDZ Brace and 4 G36 P-mags with Magpod floor plates in a Pelican V730 case with an aluminum Data plaque. B&T; was OEM for H&K; on these handgaurds and Top rails and they are no longer in production so these parts are becoming more and more scarce.