HELP!! - Head spacing problem and confusion

[RAP66]

Yesterday I finally put all my parts together and built up my Mega Maten. Towards the end of the build I dis-assembled the BCG to check for head spacing. The "No-Go" Gauge worked, the bolt would catch on the gauge but not rotate (and go into battery????) OK GREAT!! I move on to the "Go" gauge, same thing the bolt catches on the gauge but barely barely rotates to lock the bolt in

I searched youtube and the forums and could not find anything that resembled what I am seeing with my setup.

Thinking I did something wrong I took the entire rifle apart and tried the same Go-No Go checks on just the barrel and the bare bolt I get the same results. THe No Go gauge wont allow the bolt to rotate and lock-into the barrel. With the Go gauge the bolt will lock onto the gauge and barely rotate to lock the bolt into the barrel.

Am I missing something here??? or is the Go gauge showing that the barrel and bolt have really tight tolerances and should SAFELY work when I go to shoot it?

The BCG is a DPMS style with Nickel Boron coating, the Barrel is a Fulton Armory 22" bull barrel in SS

Thanks

Rich

[mark501w]

If the go works & the no go doesn't you are within acceptable tolerences.

[bbgughj]

http://www.gunsnet.net/manuals/BUILDERS_GUIDE.pdf

[RAP66]

Went though it again, still the same. One thing I forgot to add is that the carrier does not sit flush with the back edge of the upper.

I took everything apart again and with the bare bolt I was able to seat a Remington 150gr 308win into the barrel not problems. I assembled the BCG (left out the firing pin) and by hand I was able to get the bolt to seat and go into battery. It was very snug but it was able to lock.

does this still sound normal?