My local range has a rental M16 with a half a million round count.
Since the owner began renting it in 1987 the gun has averaged 500 rounds a week.
It is a form-4 registered receiver Colt with a 14.5" barrel, finish worn away all over but cool looking in a nostalgic kind of way, like a rifle that came out of a 100-year war.
The pin holes are just fine, none of the egging people talk about... It must show up after a million rounds I guess...
The rifle shoots perfectly and he never had any serious problems, just things getting stuck when the rifle went without cleaning for too long.
I've begged him to sell the rifle to me but he won't let it go, he said it's made him well over $100k in rental profits over 20 years and he will keep renting it until it quits... so far it is not showing signs of that.
Now how many of you expect to shoot an average of 500 rounds a week for 20 years?
I'd say the non-rotating pins are a solution to a problem that does not exist.
Maybe I should invent an anti-kaboom harness that wraps around the lower for added structural support, I bet if I make it look cool people will buy it...
NO-K"Protect your rifle from harmful k-booms"
Man, I can already see the dough rolling in.