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Very solid and well built tool. Fit very snug in the 2 uppers I tried it in. Definitely makes installing and tightening down the barrel/nut much easier without any chance of slight misalignment of the lugs.
Bought this for a 300blk build. I took the bolt out of the bag and put it in my upper, no oil, haven't fired it, and left my gun on my dresser for about a week. When i went to oil it before shooting it there was surface rust all over the carrier. It functioned well to fire about 10 rounds. After that combined with the clp oil it seemed like the rust might be coming off. I would have to question the nitride finish because my 3 other nitride bolts from Aero and PSA haven't rusted while sitting around waiting for my other build parts to show up.
2nd time using Stingr rails. Both installed and have performed great. I like the anti rotation tabs. They also include a barrel nut wrench which is helpful to not have to go dig one out of the tools bin. Also very light. Overall great purchase.