Generally anywhere from 16.20' to 17.25'. Depending on the actual length of your specific weapon's barrel this extension will get you past the 16' BATF legal minimum for a carbine. Designed to be a force fit over the 0.800' of barrel that extends out past the 3 lugs. NOTE: This is a NON-THREADED Barrel Extension, meaning that the back end has a Special hole for about 1.00' that will be a super tight fit to the barrel of a POF-5, SW5 or HK 94 barrel that does not have a thread on it. Price INCLUDES USPS 1st Class Mail & Insurance.Īlso available in other thread patterns (Call or email for details: 76 or page is ONLY for the ADAPTER / BARREL EXTENSION seen in the 1st photo above. after the tight fit NON-THREADED hole / Price includes S&H for 1st Class Mail. Hole Bored for POF-5, SW5 & HK94 without a threaded barrel. ADA Brace Solution / MFI 9' Barrel Extension / with Special I.D.