What to pick @ same price?: S&W M&P AR15R 5.45 or Bushmaster SuperLight AR15 .223

[MrOldLude]

Gotta love the spin.

I would not touch one of those carbon 15 lowers.

Pretty much.

Carbon is a great material when used for bending and tensile properties. But carbon composites suck for bearing strength and compression loads. They're no doubt light(er), but weight aside, I don't gain any benefit from from the rest of the piece.

I'd have to be swimming in acid to wreck the aluminum pieces on a standard AR.

edit: Though all manufacturers have to start somewhere. I know people did and do have similar feeling about Glock receivers. And it appears the cracking issues was largely a problem with earlier models. So, maybe they're okay. But they're not mainstream enough for me yet.

 

[Birddog1911]

If you have time, there is a thread over at the big AR site where someone stated that they were having problems with their Carbon. I don't recall just what the problem was, but I recall that it was on the serious side. And unless you're planning on shooting in direct contact with mercury, I don't think you have to worry about an aluminum receiver corroding!