Problem - I have a colt 6520 w/ lightweight barrel. I've tried the GG&G side sling and did not like it sitting that high on my sight post. Tried the Bushmaster and it just does not fit right. Looking at past posts, this seems to be a common problem with lightweight barrels. I DON'T wish to modify one to fit snug on the barrel. My question is this, is there a side sling mount that is meant for the lightweight barrel, that fits snug and does not need modification? Maybe a USGI one from before they switched to the heavy barrels? Help.