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The WE fill valve and the TM fill valve behave differently.
The WE fill valve is a silent fill valve and gas will not escape at all during filling, and will just stop on its own when the mag is full. The TM fill valve will always vent gas while it fills, when it's full the valve will vent more gas, and you will see liquid propane being vented.
WE fill valves allow the mag to be filled until the mag is completely full of liquid propane which bring FPS consistency down. TM Fill valves fill the mag and leaves additional room for air so there is some room for the liquid propane to expand which translates into better FPS consistency from shot to shot.
You may get more shots out of a WE mag, but you'll have more variances in between shots than you will with a TM mag.
That being said, you should still be able to get 1-2 full mag's worth of shots with a TM mag.
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