ask away faygos.
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Dunno if it matters, but with the bolt closed I really have to hammer on em to get the mag release to catch. Open bolt is no problem. The upper and lower are matched pretty well and they run well with other pmags. Oh God I'm looking at buffer info again. I thought that was just a bad dream.
What happens if the bcg retracts too far? This was kinda relevent. Checking bolt travel sounds like a good idea.
I did hand crack a bunch and they worked fine. Solid advice.
Being difficult to insert on a closed bolt shouldn't be an issue.
Your link describes it perfectly, it's basically a reliability check. .308 BCG's have more mass, so if it gets too much energy to slam into the bolt catch, the bolt catch tends to break. This is compounded by the fact that many AR-10 bolt catches, such as the one in the Aero kit, are MIM and are therefore weaker. A machined, steel bolt catch would be a good longevity/reliability upgrade.
If you can feed manually, now you can try adding a heavier buffer or decreasing gas if you have an adjustable gas block. A heavier buffer would be the better bet. Or blame the D-50 for feeding too slow, especially if the problems get worse towards the end of the mag. Can you increase the spring tension in one of those?
I was more than happy with the D60. It dumps like a boss. The D50 spring tension is adjustable, will report back.
Non adjustable gas block. Not to belabor the point, but other mags run fine. Getting ahold of Magpul sounds like a solid course of action.
Malfunctions occur regardless of loadedness of clipazine.
Other folks I've spoke to also had no problems with this cursed piece of technology.
To my knowledge the bolt catch works well and as was intended.