hope this hasnt been answered 100 times. ive been doing searches for days with no answers. (how i found this forum) i have a DPMS classic upper with 24" bull. bought it lightly used from a local who went to a shorter/lighter setup. i bought a phosphate coated BCG from JSE. when i drop it in, the lugs dont line up. if i pull the cam pin, allowing the bolt to rotate a tiny bit more, it drops in fine. i had a few people eyeball the upper and they said it looked fine, so i sent the BCG back to JSE (who have been great btw) they tested it in two custom uppers they had in house and said it worked fine, so sent it back. brought the BCG and the rifle to a local shop to see if they could figure it out. they pulled the BCG from a factory new LR-308 on the wall, and it dropped right in my upper. the JSE BCG didnt fit in the factory rifle they had. any ideas here?? im dying to get this rifle out to the desert.