Ok..just a bit of an update for those having perhaps similar issues. I had a friend who's more familiar with gas gun internals than I have a look, and he found something interesting which I wanted to report. Apparently ALL of the propane mags had leaky/sticky valves (these are original KJW mags btw, not knock-offs). Some teflon tape fixed the issue right up.
The CO2 ones still expel all gas though after 1-3 shots, and now I'm thinking it has something to do with the part where the canister punctures....perhaps not sitting square and flush to the canister...just a guess at this point though and I've no idea how to test that theory. Still looking for potential solutions if anyone can offer any. Perhaps in the off-season I'll put 'em in your hands Styrak for a look-see. Thanks for the offer.
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