consistency

My goal is to have more consistent shoots on 70-80 m currently i am reaching them no problem and with little wind i can shoot down a can of beer on 73 m with 3-4 shoots. also im having trouble zeroing it in sometimes (i think its the scope tho). on a non-little wind situation my shoots are...

I've been building a custom ca 25 for about a year just tinkering with it. It has had almost every part in it changed. My main problem is that it is not very consistent. I do not know how to make its Fps more consistent. For a while I had a silent piston head in it, but I removed that because I...