We've gotten quite a few Sig Sauer 516 uppers in stock!http://www.sigsauer.com/SigStore/16-sig516-upper-assemblies-417.aspx
Great for upgrading your direct impingement-based ARs to a piston system for increased reliability. All models feature a free-floating aluminum quad rail and barrels with a 1:7 twist.
These piston uppers also have an adjustable gas valve to increase the flow of gas when operating under adverse conditions. These uppers also come with the buffer and spring.
Current MSRP is at $1,132; we are selling ours for $950.
We will be advertising these uppers on our facebook page to the general public in a week from now, but 2aHawaii members get priority notification on these great uppers.