Just ordered my new Shilen 223 AI barrel from NSS and this will be my first barrel swap. So from what I have been reading I will need a 223AI go gauge and a standard 223 gauge is my no go gauge correct? I have been reading I can use a standard new unfired 223 case to set my head space. I also read I need a .004 crush fit. My biggest question is how do I go about getting or knowing I have .004 cruch fit on my standard 223 case.

One more question. If I use the 223AI go gauge then I can just set my barrel up tight to that gauge and be go to go???

Any advice or help with this would be great.

Thanks MIke