Yeah, I had 2 of these. When the first one started short cycling with the gas block fully open, I called J P and told them of the problem. The guy I talked to asked how many rounds thru it? I told him max 3 K and he told me that's all I could expect out of them!! Looking at the last one now, which I know has less than 2 K thru it before it died ,and the black coating is gone for about 1/4 " on the upper receiver contact points at the forward end under the key. These always were run WET. Running the SS lo mass now. Would try the new one but would like to know the expected round count life if properly lubed.