Just got my M4 stock adaptor from RA and installed it with a Magpul CTR. If you are going to run a single point sling you need to also purchase RA's sling plate adaptor as the back of the receiver is completely different in shape than AR end plates. The folding stock that comes with the XCR is great but I like the option of changing the LOP depending on what I am wearing (heavy coat, vest, etc) at the time. The adaptor and end plate was $49 if I remember correctly.
MadDog
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