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PDI 120 could be a bit higher than stock, or it could be a LOT higher than stock. Better to get it out and put in a Prometheus 110 or 120 spring, your mechbox will be happier (my PDI 150 spring ......... 350fps.........busted my stock TM MP5 mechbox in two months, and my Hurricane reinforced mechbox after two years). Also, the PDI springs are stiffer than others and you'll probably find slower rate of fire and less battery life, especially if you are using a mini battery in your M4A1.
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