Guys, remember that there are two different 6520s. One is the R6520, which was a pre-ban, and the other is the AR6520 which was a ban-era model. The R6520 did come with the CAR stock (N1) and many had the sear block which would dictate the use of the half moon carrier. The AR6520 came with the 4th Gen waffle stock and did not have the sear block.
"A Bad Day At The Range Is Better Than A Great Day Working"
USMC Force Recon 1978-1984
US Air Force Res. 1995-2004 (Air Transportation)
M16/AR15 shooter since 1978, gun collector and AR builder since 2004
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