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I pulled the spring out of a Barrett and compared it to an ISMI spring and they were the same length. I didn't put the ISMI in the mag and am not sure about compression rates and all that stuff, but it might work. Another thing you could try is calling Barrett to see if they offer them. Of course, the last time I called them the lady I spoke to was pretty cranky and short on the phone, so good luck.
 
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