What does this allen screw do?

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Right side of Wildcat sniper, on air tube is this brass 2.5 mm allen screw, I cant find any reference to it. Can anyone help with this?

thanks

grumpus
 
I am not familiar with that FX model, but it could be that the regulator may not be oriented the direction as designed and shown in the manual because assembly with the regulator pointed out makes for easier tuning. Alternatively, threads are not always machined exactly the same and thus may not line up the same on everything at final assembly.
 
Made in UK,

My MK3 Wildcat .30 Sniper was an early version and the manual pictured reflects this. It is possible later versions have changed. WM

Yes, most of the newer stuff, mavericks included, the reg screw is accessible without stock removal. Similarly it was accessible on my wildcat mk2 with amp reg, and that was before the mk3 was available!