First, please make an Intro post, it's forum rules.
Gas rifles usually arn't worth the time unless you get a HPA rig for them, and that is a decent chunk of change. You could get a Tanaka M24, and those are pricy as it is.
But AFAIK, There isnt a gas bolt on the market for the M24, so unless you drop the coin on the Tanaka, your SOL.