If you just want a game blaster with reliability, parts available, and fewer hassles…
I’d go for a WE tech Glock.
(currently) available parts, good mags that don’t leak very much, readily available.
I’d buy one new, and have (some) peace of mind, knowing you have a unused item and 30 days warranty.
Anything 2nd hand has unknown useage and history ( only used by a little old lady, on game days, on a sunday.!), and you have to deal with the randoms from F/B marketplace.
They will usually want top $$ for old worn out stuff, that is a end user lottery.
Bypass all the crap, go to a store, and try it out there.
Put a couple of mags through it there, that way you know you are taking home something thats working.
Any leaks…just get another one, on the spot, easy.
Simple life, for not many $$ more.
WE tech are good, any glock model will be popular.
AW also make good gear.
Any gas blaster will likely leak eventually, grab some spare parts while they are available…
There are some cheaper, modern elec blow back pistols that do 200 fps and have a hop up…they may be an alternative to gas worth considering…