A little help would be appreciated. I have a S&W M&P 15 with the classic standard handguard. I want to replace it with a quad rail. I bought a cheap quad (Guide Gear at Sportsman's) and gave it a shot. It seems the ring that holds the original handguard does not fit the shape of the quad rail. This also seems the case for the ring at the front of the rifle attached at the front sight -the shape is not right. So, am I out the $50 I spent on the quad rail or is there a way to make this happen?
(I also won a sling at a FNRA dinner and found it does not fit -the sling swivels do not fit around the thick sling mounting rings on the rifle. Sigh...
Otherwise I am very happy.