Re: magpull ms2 sling
BARFCOM! An entire industry forum for Magpul and their gear just waiting for eager viewers (not to mention countless other threads in other areas of the forums that will deal with single-point slings and such...even an entire H&K forum in the Industry area).
But I'll save you some time...even at its shortest length, the MS2 will keep at least the cocking lever of the USC at groin-to-thigh level and your barrel even lower. Unless you are wearing them way too short to be of any legitimate use while carrying your rifle or you are just standing around without moving much, all single-point slings will leave a portion of your rifle dangling at the level where you are going to get hit in the nuts (or with the USC's 16" barrel, potentially knee-capped)! If you try taking up some of what you consider to be the excess length on your current sling to get it shoter where your USC isn't hitting you at thigh level, you'll quickly realize that it is too tight, restricts your movement or otherwise won't allow you to properly maneuver your rifle around your body.