issue with M4 stock adapter

I do not always use the the arm brace and tube on my sdp but keep it on most of the time but today taking it off for a full cleaning I have noticed that the tube has been stripping out the adapter! I know its plastic but didnt know it was that cheaply made!!

Yes ................. you would think that for $75 (original price of the adapter) or even the current $59 price, you would get something more than a piece of plastic. The arm brace or cheek rest adapter for the CZ Scorpion EVO3 S1 is metal and can be had for $50.

My stock adapter broke. The hook snapped off. I told KRISS reps and they said "That sucks" and thats it.

Just got my CRB for xmas, stock adapter broke in a matter of seconds.
Do Not Operate in temperatures below -20c (-4f)
Stock latch will snap like a tooth pick.
Have yet to contact Kriss directly. But so far warranty will not cover stock adapter for the shop I purchased at.