Hi guys, I've been looking to buy replacement/replica SA80/M4/M16 barrels with muzzles identical to existing service rifles. I'm very happy with surplus or spare barrels from the real thing, or replica ones as long as they are identical to the real thing with a 5.56mm bore. My interest is in the first few inches or so of the barrel. Are the muzzles of these three service rifles basically identical? IOW same flash suppressor dimensions, etc. Can you guys point me in the direction of someone who can sell these to me? If I wanted to buy a working 5.56x45mm firearm with the same muzzle as a SA80/M4/M16, am I better off in terms of availability and price to get any 5.56x45mm bolt action rifle and replace the barrel, or to look for a SA80/M4/M16 with the gas operation removed to be compliant with UK firearms legislation? Ta.