Let's see 3,000 rounds, that is 500 a day in my select-fire instructor course. Actual round count was closer to 2,400 or 2,500. Of that, about 1/3 was auto - burst not dumps. One of the first classes I gave, about a decade ago, was for an agency using new Bushmasters. Extractor problems right out of the box. Bushmaster next day aired them new bolts and they were good to go the rest of the course. At the time we didn't stock enough parts to fix them on the range. I do not know if the agency had to return the bolts or if they kept them as spares.
The only other problems I've had during the courses I've taught - patrol rifle, patrol rifle instructor - were with LESO rifles and most of them were, obviously maintenance issues.
Now, I want to be clear, I'm not some big time traveling instructor, but I've seen some rifles through programs I ran. Maybe it the law enforcement 'you use what the agency issues' mentality, but I've never gotten too wrapped up about roll marks on rifles.
I get it that folks are biased, we had such bad luck with our Mossberg 500's that I wouldn't have one, but yet I've managed to teach a lot of students using them in our basic course, our firearms instructor course, shotgun instructor, and tac shotgun/less-lethal instructor.
Likewise, there are auto-pistols that are abominations to use teaching new shooters - S&W Sigma comes to mind - but you drive on.
As I said, maybe that 'use what the agency issues' mindset colors my perception.
As a former military parachutist and jumpmaster, I chuckle at folks worrying about cam pins that aren't showing wear, they'd shit if they ever saw the run-of-the-mill pack opening spring bands on the T-10 reserves we used after they'd been issued and JMPI'ed a dozen times.
Buy the best rifle you can afford, or choose to spend money on, shoot it, correct problems if any, shoot it. Maintain it. It is not that complicated.
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