Originally Posted by
MistWolf
3 ounces is almost a quarter pound and is a significant savings on a rifle like the carbine. While lightening the lower doesn't change the polar axis of movement very much, it doesn't make it worse either. By itself, it's not much but couple that with a pencil barrel, light handguards and and a buttstock like the MOE or CTR, you'll have a lighter, livelier rifle. If they also come out with a lighter upper receiver, that will save even more weight.
They have lighter profile barrels, lighter buttstocks and lighter handguards. The only places left to shave weight is the lower and upper receiver and the receiver extension. While this lower may not be be for everyone, it could be a good start to build a lighter weight carbine