What's the diff between the Novak Low Mount and Dovetail Carry sights? My impression are the low-mounts are tiny (like the ones on my Beretta) and the Dovetails are big (like the stock Springfield Loadeds at the store). Are both available for all pistols, or only the big ones for 1911 and little ones for HKs, Glocks, Berettas, etc.?