PMI USP assistance

MAFitzy32 · 08-04-2010, 10:22 AM

I recently purchased a PMI USP pistol for $10 with the understanding that it leaked, which i was fine with. I'm 90% certain that the cup seal is messed up and needs to be cleaned /replaced but i can't seem to get the valve body out of the receiver. Does anyone have any experience with this marker that could shed some light on the removal process? I removed all the screws and whatnot but there seems to be some trick to pushing the valve out the back that I don't know.

El Super Beasto · 08-04-2010, 10:29 AM

Try a pencil, use the eraser end or a battle swab. Also make sure the valve retainer screw on the underside of the receiver has been removed. If the valve is still stuck, the valve orings are swollen, then you need to put the gun in the freezer for 10-15 mins then try again.

MAFitzy32 · 08-04-2010, 10:43 AM

The problem is that I can't push from the other end. The 12gr piercing pin is pretty firmly attached from what i can tell so i have to push on it through the hole for the retainer screw. i'll try putting it in the freezer. thanks for the help.

Grendal50 · 08-04-2010, 10:55 AM

Make sure both screws are out and try to push it out from where the striker is with a dowel

MAFitzy32 · 08-04-2010, 01:26 PM

I managed to get it out. I didn't realize that the 12gr piercer would come out too so i just pushed it all through. Seems that the problem isn't the cup seal at all, but may be the fact that the valve spring is too soft or the drive spring is too loose. I'm out of 12ies though so i'll have to find that out later.

08-04-2010, 10:22 AM	#1 (permalink)
MAFitzy32 Rec Poster Join Date: Mar 2009	PMI USP assistance I recently purchased a PMI USP pistol for $10 with the understanding that it leaked, which i was fine with. I'm 90% certain that the cup seal is messed up and needs to be cleaned /replaced but i can't seem to get the valve body out of the receiver. Does anyone have any experience with this marker that could shed some light on the removal process? I removed all the screws and whatnot but there seems to be some trick to pushing the valve out the back that I don't know.

08-04-2010, 10:29 AM	#2 (permalink)
El Super Beasto Whats a regulator? Join Date: Jan 2010 Location: Halifax, Nova Scotia	Try a pencil, use the eraser end or a battle swab. Also make sure the valve retainer screw on the underside of the receiver has been removed. If the valve is still stuck, the valve orings are swollen, then you need to put the gun in the freezer for 10-15 mins then try again. __________________ http://www.mcarterbrown.com/forums/f...-feedback.html

08-04-2010, 10:55 AM	#4 (permalink)
Grendal50 MCB Member Join Date: Jul 2008 Location: North of Worcester, Ma.	Make sure both screws are out and try to push it out from where the striker is with a dowel __________________ "Some people say that I must be a terrible person, but it's not true. I have the heart of a young boy in a jar on my desk." -Stephen King http://www.mcarterbrown.com/forums/f...-feedback.html

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08-04-2010, 10:43 AM	#3 (permalink)
MAFitzy32 Rec Poster Join Date: Mar 2009	The problem is that I can't push from the other end. The 12gr piercing pin is pretty firmly attached from what i can tell so i have to push on it through the hole for the retainer screw. i'll try putting it in the freezer. thanks for the help.

08-04-2010, 01:26 PM	#5 (permalink)
MAFitzy32 Rec Poster Join Date: Mar 2009	I managed to get it out. I didn't realize that the 12gr piercer would come out too so i just pushed it all through. Seems that the problem isn't the cup seal at all, but may be the fact that the valve spring is too soft or the drive spring is too loose. I'm out of 12ies though so i'll have to find that out later.