Ive never seen one 1st hand, so I can't say anything. They do seem to have a good deal of gimmick receivers. Those kinda seem cheesy. Google pulled up some reviews and info posted on ARFcom
The AR-10 is not Mil Spec so be very careful about what you buy! The radius where the upper and lower housings meet may not be the same.
AR-10's are not at all the same as in AR-15's where one housing fits any other housing. Each manufacturer may have his own ideas about machining their housings. Look for a matched pair.
I've been converting my AR's to be compliant with CA's draconian laws. I have two AR10 class guns, a Sig716 and LWRC REPR. Neither have been able to use to ARMaglock conversions even though the AR15 kits worked without an issue.
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