treerat assassin

Nikon D3100. Just bought one and its fantastic. Plenty of deals about for around 400

Well, thanks for your input. I am not doubting my mates ability. In fact he is far more experienced and capable than of any of the gunsmiths I have met. We are not talking "some bloke with a lathe in his shed". If anyone can come up with a useful answer it would be most appreciated. If not I'll just have to go to the gunshop and measure one already done. Thanks.

i have bought a sound moderator for my 243. It's got an M18 x 1 thread and it's going on to a heavy barrell. I am going to get the thread cut onto the barrell by very good and trusted engineer but just not sure how long the thread should be on the end of the barrell. Any help would be gratefully received. Thanks.