A couple of things.
1. DPMS isn't a site sponsor.
2. That would also be on par with DPMS quality.
Would they be off limits if they were a site sponsor?
Actually the if you read the Mission Statement under Rule 4 it states to contact the dealer or manufacturer first. I think we do the best to enforce that rule.
Having said that it can sometimes be difficult to enforce when the said company is a "repeat offender".
So who was it?
am i the only one who doesn't give a rip who the manfer was?
as to the question... the topic of the thread, and all....
bad muzzle could do that- if it was REALLY bad. i guess if it was that bad, re-crowning might not be an option.
was it keyholing? might be a leade issue. when the firing pin strikes the cap, the cap pops and shoots the bullet into the leade. how the bullet lodges into the leade, awaiting powder combustion, determines how the bullet will travel down the bore and pop out the muzzle. if it lodges into the leade all cattywompus, it'll fly all cattywompus. leade problems usually cause keyholing, though.
for groups THAT bad, it really sounds like a loose barrel.. perhaps it had an under-sized barrel extension on it, or an otherwise bad/misfit barrel extension... something to cause play. every time you fired, it'd move the barrel.
just speculating/throwing some stuff up, obviously.
I guess the question is, what did they do and when to rectify the situation and identify the out of spec barrels before sending more out? Do they laser boresight their uppers or anything along those lines? You'd think they'd have caught something like that during test firing if it's more than just a function test.
The company is BCM. The only reason I didn't say who it was because I posted this thread before and it got pulled because they didn't have the upper in their hands yet. I was still waiting on my call tag to come.
Over the years I have owned or shot rifles that have been shot with corrosive ammo and left to rust leaving some pretty ugly bores. The accuracy of some of these guns was surprisingly good considering. On the other hand, I have seen M1 rifles with muzzles worn out from cleaning which, despite an otherwise pretty good bore wouldn't hit the barn. The two critical parts of a barrel are the chamber and the muzzle. An oversize or eccentric chamber if fatal to accuracy.