May seem like overkill for a Buckmark, but genuine Eotech's have zero parallax. The XPS series is reasonably sized, comes in a single dot, or dot within a 65 moa ring, but is very pricey. If extra size dosen't bother you, get an older 512 model. They can be had relatively cheap, and run on AA's for a long time. It will look huge on the Browning, though. Just be cautious; there are a LOT of fake ET's ou there that look and feel almost perfect, but are junk by comparison, and will have the same parallax issues.