Great upper - Geissele USASOC AR15/M4/M16 Upper Receiver Complete Group

I grabbed a 14.5" straight from Geissele for under $1000 on sale a few years back. Just picked up an 11.5" for regular price because this one of, if not the best upper for the price. The only thing better would be a Geissele Heavy Duty upper w/ a heavy barrel. Accuracy is great with the better ammo. After over 1k rounds, it's been 100% reliable. The Enhanced Bolt Carrier group included with the URG-I is amazing. It's so easy to clean. I'm not the type to clean my rifle after every range trip so they get a bit cruddy. Works perfectly every time. The only negative is the barrel profile.