I use one of these in the cold. In the summer it shoots 370-400fps and one game I played at 5'C it shot 280-300fps. WE guns are designed to use these but they also fit in TM which I really don't recommend.
Often the pressure is too much for the hammer spring for the first 2-3 shots and I get around 50 shots out of a 12g cartridge so fire it a couple times in the test fire/hopup setting area before having to rely on it as a sidearm.
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