So for the last couple of months I have been putting together what I think is an ideal AR rifle. Unfortunately I just had shoulder surgery and can't get out to shoot it yet. I have come to prefer piston driven AR's for a number of reasons including their ease of cleaning and the lack of gas to my face (lefty) when shooting with a suppressor. I have been searching for a used ambi (KAC, Sig etc) lower for sometime. I recently located a used Sig 516 lower with a few upgrades including a nickel boron hammer and .45 deg BAD ambi safety. I installed a buffer tube and the associated equipment and ordered a Magpul ACS stock to finish off the lower. The same week I found the lower, I located the upper I had been searching for, a PWS MK-116 Mod 1. This particular upper uses a long stroke (ala AK) piston system that is very intriging to me. I hope that it will deliver the performance I expect that it will. Thus far I am very impressed with the quality of this system, it shows a ton of inovative thinking. It is also very light weight. I topped the upper with a Warne ramp mount and ordered a Burris MTAC 1-4 to facilitate accurate shots. I used a Warne 45 deg forward mount and added an LWRC skirmish rear sight and one of the new Magpul Pro front sights to use as back up. Used a Magpul forward grip and a Blue Force VCAS sling as the final touch. Well not final I still need a light, have not decided on which one yet. Now if only I could get out and shoot it.