The Spitfire 3x prism interests me but not sure how it would handle an M305 as it is specified for 5.56? It looks similar in style & price to the AR332 scopes which are suppossedly able to handle 7.62 rounds, as well as being ballistically calibrated for 7.62. Also there is a quick release mount available for the AR332, not clear if one is available for the Spitfire 3x?