Mainly target shooting, far too old now for running around the woods, again thanks for your input guys, and stay safe,
You might be surprised.
Green gas can be problematic in winter, but if you're shooting on your own land, and can keep the gas and mags stored at room temperature, you might be fine with it, and blowback guns are great fun.
So given your requirements I'm going to do something a bit unusual and point at a site that I normally wouldn't recommend.
https://www.onlybbguns.co.uk/pre-order-army-17-series-gas-blowback-pistol-polymer-body-and-slide-r17-5
I have the equivalent AA R17 with a metal slide, but a lighter plastic slide actually makes more sense for a green gas gun over winter (and the Glock should be polymer anyway). It's a surprisingly decent pistol for the money, and takes Toyko Marui compatible magazines (e.g. WE G17 mags) and TM parts if you ever wanted to throw more money at it.
Comes in a deal with some gas and BBs as well.
https://www.onlybbguns.co.uk/army-17-series-gas-blowback-pistol-polymer-body-black-with-ares-0-25g-4000-1kilo-bb-s-with-gun-pouch-green-gas-bundle-deal
Right, that out of the way, I've just stripped and lubed my PT92 properly, and I'm off back out to the garage to see what it can do. Then I might try throwing a cut down AEG spring into it...
[SEEN]
Huh, that is actually surprising. With the barrel and hop cleaned - and there is actually a fixed hop - and the piston head silicon greased rather than just a quick squirt of lube, I'm actually seeing a pretty consistent 0.49J / 230fps with 0.2g, and the grouping isn't awful either at garage ranges.
I only bought the thing out of pity in a going-out-of-business sale at the local ned armoury, but I'm almost tempted to actually run it on site just for laughs.