The first is just a simple build I put together. I started this around October but didn't finish putting it together until December. PSA 16" A2 barrel, MOE handguard, with an M4 collapsible stock and iron sights. I didn't want to spend much and kept it as simple as I could. I plan on putting either a Primary Arms Microdot or maybe
dish out the money for an Aimpoint or an Eotech.
I just picked up the second upper today and installed the scope not long ago. I picked a bad time to start building this one(right after the Sandy Hook shooting) but I had a spare lower and felt like I needed a larger caliber in the arsenal. The upper was built by Ident Marking and I'm very impressed with their service.
It has a 6.8 ARP barrel, ARP bolt, Troy Alpha 11" rail, Burris PEPR with a Vortex Viper HS 2.5-10x44 on it. I may add a new stock but for now, I'm done spending money.