hpa conversion to gamo co2 exreme

been messing with this one on and off for a while,think paul saw the small hpa proto type cylander when you were here mate,the new cylander now holds 280cc hpa,still running it at 1100psi without reg,but seems to work really well so far,getting 25 shots at 11/11.5 fpe with 7.87gr pellets,and another 10 usefull shots at 10/10.5 fpe before pressure gets down to 850 from 1100 psi.like first small 100cc cylander this one allso screws directly into valve same as the 88gr co2 disposable cylanders,so rifle can use either co2 or hpa,co2 gives approx 8fpe so the hpa cylander giving allmost 12fpe a worthwhile power up,allso upgradeed bolt lock up by replacing the plastic locking bar with a steel bar just to improve saftey margin a little,wasnt that impressed with all the plastic working parts in receiver and will replace as many as can with better wearing steel parts eventually,just a good fun project,as only paid $150 for rifle and airking 4x32 ao scope and rifle had only used one 88gr co2 cylander when i purchased it of a mate while back,cheap project to get a handy pcp rat rifle,tho will admit proberly the uglest rifle have ever owned,was looking at fitting reg to cylander but cant see point now as its working fine as is without reg and 20 full power shots is two 10 shot mags worth,plenty for few hours knocking rats over.