Propane expands in hot temp, therefore it increases in pressure. As said above, a stock hammer spring won't hit the release valve hard enough to get the system to work. You can get away without an enhanced hammer spring on hot days, simply by dry firing your gun a half dozen times after you fill the mag with gas, then load it and go play. Largely from what I've seen is overfilly causes the biggest problem, relieving some of the pressure after filling tends to sort things out.
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