Complete, Fully Assembled Feature-Rich "Top Half" With Threaded & Ported Barrel Options Top off your next custom pistol build or upgrade with our Complete RMR Slide Assembly for GlockA(R) 19 Gen3, available in three configurations. You can get your slide with a premium match-quality barrel, a A 1/2"-28 tpi threaded barrel to accept a sound suppressor, or with a ported barrel that vents through a window in the top of the slide to counteract muzzle rise and help you keep the sights on the target for subsequent shots. This eliminates the need to install a bulky compensator on the muzzle, which means your new comped pistol will still fit standard holsters for the G Mfg: Brownells