So I got my SI Defense together and am having trouble on one of the uppers w/a BCM 7.62mm gunfighter charging handle. It comes back to about my nose on the first shot. It stays there on subsequent shots or if you push it back to battery it'll come back to nose one the 1st shot. My other upper doesn't do this. My 4 other ar-15 builds don't do this. Has anyone any insight on this?
thanks
Jay