And overall, while I agree with much of what you wrote, I think it's worth pointing out that none of these issues are directly cairrer-related: instead, they are related to the bolt itself and/or the wear components that are a part of the carrier (i.e. firing pin retaining pin, firing pin, and cam pin).20,000 or so rds for a military spec BCG. Check exact head space upon delivery/assembly/build. Check again at 1000 rds. Then check every 5000 rounds. Please understand that after a certain fairly high but variable round count the bolt head and barrel extension will take a liking to each other. Metal will slightly move. The will lap.
What this means is that if you have a high round count bolt and it becomes non usable it might be a safe idea to change out the barrel along with the new bolt. You can swap out bolts back and forth but you have to work at it. Changing bolts every 1000 rds will make everybody happy. They wear evenly. Cam pins have finite lives.
Same with firing pins and retainer cotter pins. Firing pins can become peened at both ends. Sometimes a cheap bolt will scour a groove in the cam pin. Not good. Ejectors last a long time. Sometimes a cheap spring will compress or set. Ejection moves aft. The AR15 is a very forgiving platform if certain things are done correctly.
Try to even the gaps between rings if you remove such. Easy to rotate each ring slightly.Why?
The rings will simply rotate during use, anyway.
I thought this was old myth that's now gone the way of the do-do?
The SOTAR cam pin video - regardless of whether one wishes to buy this product - explains this pretty nicely:The bolt should NOT wear grooves in the cam pin. Just even polishing.
If in specification the cam pin will NOT fit either way into the bolt head. Only one way. Use lots of lube.
This is completely opposite everything I've ever heard or been taught by various industry SMEs, with key hardware, torque, and staking being crucial.Blue lock tite on the key screws. Do not stake.
I'm assuming you were responding to me, about the SOTAR physicals/autopsies?Can those be found online?
I really enjoyed this, Thanks!I'm assuming you were responding to me, about the SOTAR physicals/autopsies?
I think you may not have been able to search them up because his YouTube account got hacked and was down for much of last week. Here's a direct link for your troubles (I also apologize for the late reply, I decided to take a Forum break for a few days).
He's just re-uploaded much of his old material, as well as came back with some excellent new stuff as well.
Absolutely. He covered two BCGs that taught me lots. One was the Fail Zero NIB and the other was the AO precision. I need to join his FB group . I would like to read his blogs also. Can you direct me to those?No problem! Glad to be of-service.
He's always updating with new and interesting stuff - so stay-tuned or subscribe to that Channel.
I've learned so much in the last few months from watching his Channel, reading his (currently only) Blog post, and reading the back-and-forth in his FB Group.
For example, I'd always thought that a good Mil-Spec bolt should have both the O-ring "doughnut" *_and_* the insert in-place. I have even added the doughnut to the bolts that came without or came without it installed. I've never experienced a spontaneous FTE in the tens of thousands of 5.56 that I've put through my beaters, so I automatically thought that I was doing things right.....come to learn that, instead, it was probably just a matter of luck and likely a testament to the excellent nature of the guns that I've bought that I hadn't made more trouble for myself with this improper setup!
"The More You Know!"