dont scope it
simple
the m1 carbine .30 carbine rnd is a short range rnd no need for a scope
I shoot mine32 and counting out to 100 rnds iron sights most of them still have the non-adjustable flip up rear sight
remember the m1 ejects up and right thats a prob with the scope
ive got a m3 (t3) carbine with the vampire NV scope it feed and ejected with no problems its buried WAY back in the room if i get to it ill get some pics of the mount setup