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Old 12-25-2012, 09:11 PM #1
dannyboy768's Avatar
Join Date: Jul 2012
Location: Orlando, Florida
Bolt tail o-rings

If I use size 10 o-rings for my bolt tail, there is quiet some friction when I push and pull the bolt with my finger, but if I use size 9 orings, the bolt glides very smoothly but I get a small leak from the hex hole in the back cap.

How easy should it be to move the bolt back and fourth? With size 9, I can point the gun down and shake it and the bolt will move slightly but with size 10 it doesnt glide smoothly at all and I need maybe about 10 oz of force to move it. Sorry I dont have a pressure tester, I know that would make things easier.
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Old 12-26-2012, 09:36 AM #2
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I use Size 10s, but I lube them pretty darn well. put in the size 9s and shoot it a bit to see if they'll settle, and if not look at a size 10 in a different material.

Oring Monkey sells Viton O-rings in size 10, and they're a tighter fit. Also, square (or quad) orings in 10 might help a bit too.
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Old 12-26-2012, 11:44 AM #3
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Join Date: Mar 2009
Location: California
O-rings don't have incredibly amazing tolerances when they're made. I would keep trying a few *different* size 9 o-rings and see if any of them don't leak.
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Old 12-26-2012, 11:08 PM #4
Join Date: Apr 2003
Location: Wisconsin
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I sometimes run a 10 up front and a 9 in back
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