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Old October 29th, 2008, 18:27   #126
Kos-Mos
 
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Join Date: Nov 2005
Location: Lévis (QC)
Systema M120.
It should set you to about 400-410.

A bit on the limit, but with the right parts, you can get it to 398ish.

You can also use a JG stock spring with a TM piston head. The spacer in the piston makes for the drop of power. That is what I am using. 398 fps on the spot.
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