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Red Beard Forge 03-13-2013 08:21 PM

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.

B-17 03-13-2013 09:21 PM

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

Brassballs 03-13-2013 09:24 PM

contact MaD

MaD 03-13-2013 09:49 PM

Try some 111s. If you want it really smooth, get some delrin ones from PPS.

Red Beard Forge 03-14-2013 12:10 AM

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?

Brassballs 03-14-2013 01:03 AM

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

MaD 03-14-2013 05:33 AM

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?

Red Beard Forge 03-14-2013 11:31 PM

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

Long Beard 03-15-2013 12:39 AM

I know this sounds obvious....but throw some lube on them before you put the bolt in too.

Red Beard Forge 03-15-2013 02:45 PM

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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