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Old January 29th, 2016, 23:29   #35
Drakker
Official ASC Geomorphologist
 
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Join Date: Sep 2009
Location: Montr?al south shore, Qc
1) Different mags can have different FPS, it depends on the output valve they have installed. Some valves have larger opening and let out more gas.

2) You should check the mag alignment, to make sure it is the same as the short mag. You can look through the breech and see where it sits. If they sit the same and there is no wobble, then it might be a problem with the valve on the long mag, or with your valve knocker, but if its the valve knocker, you'd probably be having issues with the short mag too. Make sure your part #57 still has the tab that keeps the mag aligned, sometime this tab breaks and mags will not sit properly. Shorts mags will fit better because of the bottom plate that prevents them going up too far, but its not the case with the long mags that will go up all the way.
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