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Lowering a KWA GBB MP7A1's fps?


HellJumper
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Hi, I've recently bought a KWA MP7A1 and it's shooting slightly hot for my field (380fps, my fields limit is 350), so I'm looking at ways to lower my fps. I'm open to most ideas and not afraid to do some tech. 

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I think, don't quote me on this, Abbey 144a gas is slightly weaker so may drop your FPS just enough. Other than that, I'm not very clued up on the internals of gas guns, think this may be one for the Proff. @proffrink?

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I tried running 144a in my kwa mp9 and wouldn't cycle the gun very well and kept locking the bolt up and venting

before I converted to HPA I ran these

  http://www.ebay.co.uk/itm/Airsoft-CNC-Machined-Power-Down-Valve-Set-For-KSC-KWA-S7-NS2-MP9-MP7-/141409941879?hash=item20ecb07977:g:rCAAAOSwGvhUGNbn

bit of a pain to fit but worked a treat plus you get two to try ones about 20fps drop and the other is about 50

 

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