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Old 03-13-2013, 07:21 PM   #1 (permalink)
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Question P series bolt O-rings?

Hi everyone,
This is my first post although I have been lurking for quite some time, I hope this isn't a really stupid question but here goes: I recently acquired a sheridan p-series (not sure which model but I think it would probably be a p68 or a LB based on pictures I have seen online) The gun does not leak and seems entirely functional except for 3 missing o-rings on the bolt. I measured the o ring grooves with a calliper and none of the common o-ring sizes seem to match I did find some that fit but they are too thick and cause the bolt to bind when it is inserted into the gun. Any help on which size o-ring I need and if possible a source to buy them would be greatly appreciated, thanks.
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Old 03-13-2013, 08:21 PM   #2 (permalink)
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Pictures? They never hurt to have. I have been running mine on one thick o-ring, but it sounds like you have a speed demon bolt. I wouldn't imagine they would be different from a stock o-ring size
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Old 03-13-2013, 08:24 PM   #3 (permalink)
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contact MaD
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Old 03-13-2013, 08:49 PM   #4 (permalink)
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Try some 111s. If you want it really smooth, get some delrin ones from PPS.
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Old 03-13-2013, 11:10 PM   #5 (permalink)
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Thanks for all the help! Not sure how to post pics here.... The diameter at the bottom of the groove is .505 and the bolt has a diameter of .682 the orings I found bring the OD of the bolt up to .695 so way too big to work. Is the 111 size a metric o-ring? The gun is also missing the trigger safety anyone have any ideas on where to find that?
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Old 03-14-2013, 12:03 AM   #6 (permalink)
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some people sand them down on a dowel to fit,220+ grit

here's another member that has about every PB size made and low prices.
he should be able to get you a couple sizes to try
O-RINGS FOR SALE - Standard, Metric, and Special Sizes!

Last edited by Brassballs; 03-14-2013 at 02:03 AM.
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Old 03-14-2013, 04:33 AM   #7 (permalink)
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111 (or -111) is a standard size. 7/16 ID X 5/8 OD X 3/32 W

You need the whole safety or just the ball and spring?
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Old 03-14-2013, 10:31 PM   #8 (permalink)
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Thanks for the help I ended up getting some -111's out of an assortment pack from princess auto and they seem to work fine... the pump stroke is stiffer than I like but I think it will do just fine.

@MaD I need the entire safety assembly not just the ball and spring
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Old 03-14-2013, 11:39 PM   #9 (permalink)
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I know this sounds obvious....but throw some lube on them before you put the bolt in too.
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Old 03-15-2013, 01:45 PM   #10 (permalink)
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I did put a little oil on the o-rings but I think it needs a bit more... I was thinking something that was a bit more like grease would be better... any recommendations?
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