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Hot KJ Works 1911 co2

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I have a KJ Works 1911 .I use the co2 mag cause the green gas mag only gives me about 8 ish shots before it runs out of gas....the co2 is great except it shoots around 340 fps ish . I have seen on a forum that the co2 mag can be modified to bring down the fps...I was wondering if anyone knows about this process...is it the exhaust valve plunger that needs filed down or is there something else...the limit for sites here is 327 fps..

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