Well, I decided to put my CMP parts on my SA inc. today. I changed out the Bolt , OProd, and Trigger Assy. Had Fulton Armory, do a NM trigger job on the trigger assy. Put on complete NM rear sight assy. too. It took about a year to get this stuff gathered up. I used a clymer FIELD gauge to check head space, it wouldnt close on it so i guess its ok. I fired 10 rds through it and it didnt fly apart. So only thing left, thats not USGI, is the flash suppressor and baybe front sight. What do you guys think about the head space check? did I do it correctly? 8O :?