Anyone have any good suggestions for a cheek rest to use on a bog-standard M4 stock? I'm finding that if I get a good cheek weld my eye is a bit too low to get a good site picture through the irons or my red dot. The joint between the stock and the buffer tube also has a bad habit of pinching my beard and ripping hair out which is kind of annoying. I've been wrapping coban over the joint but I'm kind of wondering if there's a more permanent solution.