Colin made me this moderator which I can only describe as modular and fully strippable. I have a number of rifles with different thread sizes and it was a nuisance bringing different mods for rifles. So as the front part of the mod, which the barrel screws into can be removed from the moderator, I asked Colin to make me a few of these in different thread sizes. I don't have any photos as the mod is help by an RFD for me. I`m sure Colin will explain much better than me! I have several of Colin`s mods and they are an excellent bit of engineering. Noise reduction is fantastic and muzzle flip is completely obliterated.