Eric,You will find that the .25 Marauder does not have enough air to warrant a regulator.You can modify the valve, etc., to increase power.Yes, you may be getting a lot of shots now but I suspect the 60th shot is way below the velocity of the first few.I have had two .22 MaraudersI am down to just the .177 (regulator equipped) and the .25.My .25 with original valve gets 16 shots at 41-42fpe which is fine for me.BTW..I have a nice Boyd’s Varmint stock with adjustable Lee cheek piece for the Gen I if you are interested.Here are my girls. The .25 is the one in black: