I'm not sure if you can make a clamp type adaptor that will hold a silencer on something as powerful as the 223 remington. I made an adaptor for my M-1 carbine to hold my 300 whisper silencer in place and one set screw torgued into a shallow dimple in the barrel was not enough, I will have to go with three screws and hope it is enough. The 223 has double the powder charge of the 30 carbine, so it needs a good solid attachment.
It should be no big deal for a gunsmith to remove the barrel, then cut threads on the muzzle end.
If you have access to a lathe, then I can show you how to make a better silencer out of steel and aluminum.
Ranb
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