I wanted to bounce a few questions off the members here. I purchased a
new Bushmaster Target AR about 2 years ago, between 3000-3500 round I
had a failure to cycle (FTC) problem. The weapon would fire and short cycle
leaving an empty chamber. Called Bushmaster and was told it was the gas
rings, that they only last ~3000 rounds between replacement. But on
removal and inspection that was the culprit, one had worn about 1/3 off and
the other were nearly there.
Replaced them and I was off to the races again. Well my round count is
getting close to that 3000 mark and it is time to look at replacing them
again. For one the bolt is "loose" in the carrier, by loose I mean it will not
hold up the weight of the carrier.
I did not replace them with the standard set of 3 rings but the helical wound
ring sold by Brownells. The Bushmaster tech did not recommend it but I
bought it an it has worked well so far. Generally, after I shoot I do a quick
clean and wipe and take a swipe or two down the barrel with oil and oil every
moving part with a drop or 2 of oil including the rings and a drop down the
gas key. About every 1000 rounds I tear her down good and clean
everything, since switching to Accurate 2230 for my reloading things are
I searched and read and read and read and this is the only thread I could
10,000 rounds on a single set of rings seems high given my experience but
maybe I am missing something here.
My questions are:
1) How many rounds do you fire between changing gas rings?
2) Is there a difference between different mfr's of gas rings or styles of gas
rings? What do you recommend?