Semi-noobish and building an AR. Help?

Hey guys,

I’ve been shooting for most of my life but I’m fairly new to the AR world and am looking for input on the rifle I’m building. I had a CMMG AR and sold it a few years ago and I really want to have something worth keeping around this time. Right now I’ve got a Rock River Lower that I’ve tricked out a bit with a better trigger etc, but I need to finish it out with an upper worth having.

I’ve got about 1500 dollar budget on this project. One upper that really caught my eye was Lewis Machine & Tool’s CQB MRP piston upper, although LMT is pretty scarce on their products details. I thought the quick change barrel feature was interesting.

Do you guys have any experience with LMT’s products or perhaps another recommendation within my budget? I’m looking for specifics on capabilities-- ie: weight, m.o.a. capabilities, barrel profiles etc. I appreciate any help here.

What is the intended purpose of the rifle?