I am a gunsmith and I got the bug for an AR and I'm not going to pay for something pre built. Before I get into the building of this thing I need some answers, like gas port size and how do I headspace the thing. I know there is a tennon or shank that has to be attached but is the there a certain type or cn I use a generic tpye. I am going to chamber it in 17-223 so I'll profile the barrel from a blank. Again no clue on the barrel set up. Other than that I can figure the rest. Also gas tube length? It'll have a 20" barrel. Like I said no clue.
TIA
Adam
