hey VZ58, have you shaped and clearanced the ejector yet? the bolt will hit the ejector just before it goes into battery....if you have a factory rec piece with the ejector in it look at the differences between the two, otherwise metal needs to come off of the backside opposite of the face(case contact side)....height should be fine
if ya need a pic LMK
Hmm mine clears fine........ I think between tolerances of the receivers, carriers and bolts there will be alot of this wont go for him but will for you stuff.
What is the Vector FCG like? I always heard you had to replace the buttstock for theirs.
The Height of the carrier matters a good bit. Make sure the bolt can strip a round from the belt, the gas piston can go all the way and the roller on the top of the carrier is riding in the top cover right.
Wish I could help, my parts might be different but if you need a measurement I can get them.
The early FCG had to switch stocks, I have generation 2 that does not.