I just picked upa 1974 AR15 SP1 a few days ago. I traded a Ross 334 straight up for it.
It's in pretty good shape and is all original. It came with two 20 round mags, one in good shape and the other not so good shape. I also got the original Colt scope and sling.
To say I'm happy is an understatement, here are a few pics.....just wanted to share.