[Spaxspore]

If you want to enhance the M1 Carbine, just buy a mini 14 Ruger in 5.56 and be done with it.

If you want to enhance again, then drop the mini 14 and get a M1a Springfield.

The M1 Carbine is as good as the design will get. Its a carbine, not a rifle. Its purpose built
for .30 M1 carbine caliber ammo. You get nothing making this wheel into a square.

+1, agreed.