I have a PWS FSC556 on my XCR w/12" barrel. With the HALO indexed in 6 o'clock position(using the SN as constant) I shot groups at 50yds with and without the can attached and could not tell a difference in the POI shift. It was an 8 shot group, 4 with can 4 without and all were inside 1". I can not say enough good things about the PWS FSC and Gem-Tech. I would be happy to send you a pic of the target and the details of the test if you are interested. PM me.
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