My point was not that you should be paying $20 every time you want to blow off a mag because you keep breaking the bolt, but that something is very wrong with your rifle because you are breaking parts every time you fire it. I would be looking at the functioning of your bolt, doing dry runs and gliding the bolt along the path of travel and see what is responsible for snapping your bolt legs.

Or you can just use a bolt without legs, either way.

I've tried to find a problem, but everything is looking just fine...Nozzle is cycling smoothly inside bolt carrier, everything is always lubed, so I have no idea what is causing this, unless nozzle somehow is reaching a top of feeding ramp and that causes broken legs issue. But I dont know how to properly check that :/

They do say that with the new bolt, it should fire fine even though the legs are broken. The last time I did that, it snapped the bolt into 2. But I assume this was from the older bolt from my 2011 AKMS.

Wondering does any of your gun hit the bolt buffer so hard that it lift the bolt buffer up and chipping it little by little? This is the part I am talking about
http://samoon.com.tw/gun-parts/ghk-a...06-bolt-buffer

I had to stuff some sponge to prevent it from chipping too much.
Fortunately, the buffer itself is very cheap to replace so it's not that much of a biggie.