First off, please dont flame me. I bought a DPMS complete upper reciever. Stainless steel barrel and chamber. Not the best on the market but it fits my budget and will do the trick for 'yote hunting.
During the initial break in, I noticed the rounds were not ejecting. I would load one round into the magazine, fire, and the bolt would not lock back, nor eject the spent round. About 60 rounds later, it began locking the bolt back but the spent round would still be in the chamber.
Manually cycling the bolt would remove the spent casing, but with a little more effort than I imagine it should take. Possibly a tight chamber? Maybe, but it did not fail to eject every round, about 75% were FTE, either bcg locked to the rear with spent round still in the chamber, or bolt failing to lock to the rear, spent round still in the chamber.
I tried Remington UMC FMJ 55gr and Hornady 40gr V-Max. Both with the same results. Have yet to try handloads, but would like to address this issue beforehand.
I called DPMS and told them what my issue was. Upon reading reviews I came across someone who had a similar issue and it was due to a gas tube leak at the gas bock. I expained this to Mark, the rep I spoke with, and he told me that there is supposed to be a little blow-by at the gas block. I did notice, after the first few rounds, some grease or oil that appeared to have blown back from the gas block along the gas tube about an eighth inch. It dried after the first 30 or so rounds and I have not seen any more grease or oil in that area. Mark told me it was most likely due to a tight chamber and I could either send it back to DPMS for them to fix (not going to happen, I'd like to use this thing this year!) or I could try polishing the chamber myself.
He told me to take the chamber brush, lube it up real good, attach it to a cleaning rod then a cordless drill and lightly run it for about 10 seconds. Then take some emery paper, wrap it around the bore brush and do the same for about 10 seconds. I don't know how comfortable I would be with this and can't find any information on how to do this online.


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