That's a KJW Non-Blow Back. Grim brought in a bunch of those a while back. Stick to shooting duster off it, NBBs are generally more gas efficient than Gas Blow-Backs, so you're getting better velocity from duster than you would if your gun was a GBB. Using propane might be unnecessarily tasking on the internals. If it's not shooting as hard as you want, you might be wanting too much too from a mere pistol. It is an airsoft gun, NBBs were GBB's grandpappy, at one time all gas airsoft pistols were NBBs.
Next time, please research BEFORE you buy.
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"The Bird of Hermes is My Name, Eating My Wings to Make Me Tame."
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