Wow, what a great kit, especially for a first time builder. I purchased an 80% billet lower and figured why not? Well, I`m happy to say, that worked ok. Next was to build the lower with the parts kit included. The 2 stage trigger group worked flawlessly. The upper fit was as good as it gets. I couldn`t have had a better build if I tried! Way to go Rock River! And way to go Impact guns. I`m a happy camper, and WILL return. Thank you.
Sugar Pine Ca.