M16 slab-sided barreled upper with triangular handguards and birdcage flash suppressor. Small hole version of the Colt SP1. Comes with everything but the bolt, carrier and charging handle. Nearly new condition with few storage/handling marks and test firing marks from factory(charging handle track in upper receiver). Asking $250. Pics available by e-mail. Out of town for the next week, but may be able to get shipped while I'm gone.