Skippy77 Posted August 31, 2015 Posted August 31, 2015 Hello, I've purchased a AGM MP44/STG44 and the fps of this is in the high 400fps. I have bought a M100 spring as I was told this could give me 320-330fps. The thing is I'm not sure how to fit this. Has anyone performed this replacement of this gun? all suggestions welcomed. Mike
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