just converted my aeg CA G3 to hpa using wolverines reaper engine with electro mechanical trigger { semi auto only} and wraith c02 stock {takes 12g c02 cartridges} , a few tiny bits to iron out but im loving it!! , anybody wanting a change from aeg or wanting to buy a new gun then seriously consider getting a HPA engine for a gun you already own , you wont regret it , easy to install aswell , just replaces the cylinder/piston , solder your trigger wires to the included wire harness and plug it in , its also stupidly quiet which is the reason i went for this , if you lightly click your fingers that will give you a rough idea ..
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