I have a Spike's 5.56 Nickel Boron BCG and it is going into a BCM BFH 14.5" Mid Length Upper Receiver Group. The BCG does not slide freely in the receiver and it can't even chamber a round. I'm trying to figure what in the setup is causing the problem and thought I might post here to see if I could get any help.
Here is an album showing the offending parts, how far the BCG goes in before resistance, and the wear on the upper receiver.http://imgur.com/a/v3tJw
If anyone could provide any help with this problem it would be greatly appreciated!