Hey guys. I have an LMT .308 with a 20" barrel, and as you know, the rail is not interchangeable, and does not cover the gas block. I am looking for any way to extend the quad rail like 4" so I can put a bipod on it as well as a foregrip at the placement I prefer. I have another LMT upper with a 13.5" barrel, and I like the grip at the very end of the quad rail. I can't find anything like I am looking for, but maybe you guys know something I don't! I appreciate your time to respond.