02-23-2014, 11:48 AM
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#11 (permalink)
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A True Z Fanatic
Join Date: Apr 2011
Location: Midwest
Posts: 1,349
Drives: 370Z PW 2014
Rep Power: 18
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Quote:
Originally Posted by SouthArk370Z
Higher stress from a rifle cartridge? Poor manufacturing?
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Both, IMHO. I've seen lowers from Plum Crazy, S&W, New Frontier, and RRA. I think there are only those that have cracked, and those that are soon going to crack. They break at the takedown pin holes, the FCG mounting holes, and where the receiver extension screws in. I think it's a combination of the higher-pressure cartridge with the torque stresses of a rifle as well as poor manufacturing and lousy quality control. Only exception (so far) seems to be the M&P 15-22. I haven't seen one of those go down yet.
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