Stock class later sterling with backbottle valve. I added the back bottle asa, used shape. Has a stock class feed which I think can be rock forwards or back (I think). Was going to use this as a loaner with a rat attack changer but have too many loaners and far too few friends. Spyder thread breech, has the velocity adjustable hammer insert but I've never adjusted it with an allen wrench down the front so I'm not sure if that will even work? Has the 45 frame with the Hogue grips on it. Cycles fine without leaks but not chronographed (or even shot I don't think). Has heavy pump stroke and will will cock with unaired.