I just went through a major thrash on building my large frame upper in a 6.5 caliber. It's a long story, but the receiver from a major brand wasn't available for a long time, so I ordered a different top tier upper to complete the build while waiting on the other upper to come back into stock. My shooting partner and I put it together and were were frankly disappointed. The barrel fit was loose in the extension. I was lucky to shoot MOA with it. So in frustration, I tore it back apart and was planning to just set it aside for the next 6 months to a year to get what I wanted in the first place. But then I stumbled across an New Frontier Armory (NFA) upper in their local shop. It wasn't cheap but the side charging handle was pretty sweet, so I thought I'd give it a try. I'm hooked! I love the side charger and it so far works flawlessly. The thing is built like a tank and the accuracy is off the chart good. This has become my new favorite rifle!