Does anybody have a recommendation for a good collapsible stock for a commercial buffer tube? My only complaint with my Bushmaster thus far is that the stock is loose (shakes a lot and is noisy) and the back is rather harsh. I tried a friend's new RRA and his stock is very nice - feels solid, no wobble, and has a thick rubber pad on the back. I see that the local Cabela's has Magpul stocks but I haven't even pulled on out of the box to examine them yet. Any recommendations?