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Old 04-27-2011, 03:53 PM   #1 (permalink)
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Springs and velocity

Ok I have a sheridan p-68AT and a pgp. Both are chronoing at about 240 despite shimming the springs. My questions are 1). Are the Springs in these guns the same size, and 2). Will the pistol spring from palmers fix the problem?
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Old 04-28-2011, 12:47 PM   #2 (permalink)
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I believe they are the same size. A few questions,
Do you have a valve tool?

What are you shimming them with?

Also does the P68AT have a velocity adjustment screw inside the bolt(access from the front, its a screw that blocks the air).
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Old 04-29-2011, 07:16 PM   #3 (permalink)
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What did you shim with?

I have a pgp2 that shoots 240 also. RVA all the way in.
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Old 05-01-2011, 02:56 PM   #4 (permalink)
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small washers that will fit in the hammer, before you insert the drive spring,(I think they are #6 washers, will have to look to be sure). You can also use a ball bearing like the one used in the bolt to prevent blow back, these fit in the hammer as well.
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