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Old 05-21-2013, 09:06 PM   #1 (permalink)
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PGP low velocity :(

Ok so wondering if anyone can help me out, Ive been slowly working on a PGP I baught a couple of months ago. When I baught it it was in good physical condition but just vented air as the 12g seal was shredded. So I replaced it along with the rest of a palmers 12g seal kit. Ive also replaced the main spring and the back plug with an adjustable one.

Now it's all sealed up nicely with no leaks but I can't get it above around 200fps. I've even tried shimming the mainspring but all that ends up happening is it gets to a point where it won't cock anymore.

I'm normally pretty good with tech issues but I'm stumped, the only thing I can think of trying is replacing the valve spring with a weaker one.
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Old 05-21-2013, 09:21 PM   #2 (permalink)
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Replace the main spring for a starters. Do you have an RVA on it?
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Old 05-21-2013, 09:25 PM   #3 (permalink)
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Is it a cartridge valve? If so, port hole might be off center.
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Old 05-21-2013, 09:30 PM   #4 (permalink)
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Yeah I've replaced the main spring and I have a RVA on it.

I'm busy stripping it again to make sure the valve definately isn't misaligned. I'm not sure what kind of valve it is but if it helps I have to use a valve tool to remove it.
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Old 05-21-2013, 10:30 PM   #5 (permalink)
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Looking again at the design of this valve, does it actually matter if the ports are exactly aligned? I mean obviously it would help with direct airflow which in turn would help air efficiency when firing at higher rates of fire. But with the valve in this the ports are recessed into the valve meaning there is a gap between the body and valve with nothing to actually block the airflow?
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Old 05-21-2013, 10:38 PM   #6 (permalink)
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If it's a cartridge-valved PGP, the alignment will make a very big difference.
I recently had the same troubles as you until I went back to stock springs and began focusing on port alignment. A small allen key is helpful here.
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Old 05-21-2013, 10:41 PM   #7 (permalink)
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Well what's the difference between the two?
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Old 05-21-2013, 10:44 PM   #8 (permalink)
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Check this link out. It'll explain/show you the differences brother!
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Old 05-21-2013, 11:13 PM   #9 (permalink)
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Thanks mate

looks like ive just got a clasic valve, but this has now raised another question for me. The pic of the classic valve and the diagram don't show any mention of a valve spring? But I have one fitted....now should that be there? lol
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Old 05-21-2013, 11:22 PM   #10 (permalink)
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My bad, read it wrong lol must be getting tired now lol
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