I use one on a Patriot and windage is no problem and I don't shoot blazers so can't help you there. What I would tell you is to call them and talk to Nibal, he will help you out. Freat guy.
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I don't like people who don't like dogs !
I'm using an APA on my Allegiance and it works great. I also have been shooting Blazers through it with no problems at all. This is one drop away I have never had a clearance problem with.