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We purchased 10 OBR's for work after T&E'ing various .308 platforms. Mark Larue would only sell us the guns with his muzzle device/suppressors. Noticeably louder first round when compared to AAC 762SDN6 as well as Surefire Socom equipped on other gas guns shooting side by side. Aw for poi shift it averaged around 1.5 moa with Gold Medal Match. No surprise he's blowing them out at that price...
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He's not blowing anything out, that combo deal has been available for a long time. It's an add-on option on the web site when you purchase.
It appears to be a simple baffle design with a wrap-around bypass feature. For the money it's a "why not?" thing for most, and it's hard to find an owner who's not happy with it. It seems to do a decent job lowering back-pressure according to all user reports I've seen.
For ultimate performance I'm sure CGS is much better, but it's in a completely different price range.