I got a second-hand daystate mk4 the one with out the screen online meet face to face looked brand new not a mark on it shot a couple of shots in there garden to see if all working all seemed fine after returning home I'm having problems with sudden drop in power between shots i think it may have something to do with the battery because if I put the safety on and off between shots it seems to shoot back up in power anyone else had similar problems the person did say it's not been used for two years it's holding pressure fine