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Posted: 12/17/2005 8:33:50 AM EDT
I'm in the middle of building another NM upper. I ordered a NM rear sight base from Brownells, a Prarie River Arms. When I received it I matched the base threads up to my CLE 1/4 MOA rear base. The threads didn't match up. I figured it was a 1/2 MOA base. I put a indicator on both bases. The 10 click average for the CLE was .019". The 10 click average for the PRA was .015". One of these is not a true 1/4 MOA base. The PRA is not 1/2 MOA. I measured a standard base and the 10 click average was .060". What is the true movement of a rear base for a one inch shift in shot placement? Thanks.
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