These adapaters are the standard 1/2UNF threads, if you need other thread profiles then please reach out to us.
There are now four screw holes, so if you damage the thread in the small locking screw - rotate it 90 degrees and you have a brand new thread! The NateChrony already comes with 2 adapters, so these are spares if you damage the originals.They're also great as blanks to protect your barrel threads. There are two profiles of threaded adapters: Slimline (This model): For bullpups, or where clearance between the barrel and air tank is minimal Standard: Our regular adapter with large easy to grip tabs NateChrony 1/2 UNF Threaded Adapters - Black Slimline. Additional threaded barrel adapters for use with the Original NateChrony.