Anyone have problems running a chromed bolt and carrier in their bushies? I purchased a chromed BCG and it won't run in my 20" HBAR or 16" M4. It seems to be "short stroking" and will not hold the bolt open on the last round. Also has FTFs. Tried 3-4 different mag types and 3-4 different types of ammo. All brass cased. Cleaned, lubed, checked gas rings... Tried it in a Double Star upper and it ran 100%. Also tried my old std. bolt in the chrome carrier and it ran fine. Weird. Any advice is welcome.