Being that I am a bit un-knowledgeable on bipod mounts but as I haven't found exactly the forward grip/rail I want for my new S&W M&P 10 .308 as of yet, I acknowledge that a bipod is necessary until I do. I would want to find one that could be used now on the original out of the box and later on a quad rail so I'm investing in one good one vs 2 cheap ones. I've read up on Harris Bipods, but it seemed to mount on a sling swivel mounting bolt, am I mistaken? I recently located the Apex Bipod Mount mentioned in the manual, I'm hopeful that is not the only way to go though. Does anyone know what other types of bipods and features I should be looking for to use in mid to long range training? ( I mounted a Nikon P-308 4x12x40 BDC with a range pack this last weekend) Presuming other types will attach, would it mount to the forward grip or the sling mount and would it be quickly attached & detached as needed?