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A&K sr25 upgrade question

2.4K views 1 reply 2 participants last post by  1tonne  
#1 ·
Upgraded my A&K SR25K with:
450mm long 6.05 barrel
Aug o-ring nozzle
Expanded piston head o-ring ring
teflon cylinder head
polished cylinder

and the seal is great! My issue now is it is shooting hot

Currently shooting ~450, my field has 400FPS limit

My question is what spring do you guys think will drop me down to ~400fps??

I am not sure the power of the stock spring through...

Also, anyone have a good recommendation for a grip? I noticed the screw mount in the grip for the motor plate had cracked

Thanks!