I been busy lately so it took a while but I finally had time this weekend to get my Lower and Uppers together and test the thing out. You guys were right it was a hell of a lot of fun. the trigger was a little tricky but other than that everything went just fine I shoulda' done this years ago. I got a Fulton armories EBR upper and a RRA tactical car ute upper with a RRA lower. Both uppers worked flawlessly in the test firing and I worked them pretty hard. Other than an ammo issue no problems at all. I highly recomend the Fulton uppers They're tack drivers. I was very impressed with the accuracy.