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After playing with this ratech bolt I noticed a gas efficiency problem. I can go through about 20 rounds and then I'm out of gas. This is using a brand new propane tank in 24 degree weather. I noticed when the gun is firing, a lot of propane is released out the dust cover. Like way more than normal. I'm guessing the slower cycling keeps the magazine valve open longer? I do not have this problem when i throw in the stock bolt and nozzle.
Also my fps is very stable. I shot 349.5 fps 6 times in a row and then it dropped to around 330. Which is exactly what i wanted. Although when I went to adjust higher, it seemed to make no difference. All the way clockwise and all the way counterclockwise and anywhere in between yields 340 fps.
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