Just curious if you leave your barrel liner o-rings on or off? Have you noticed any change in accuracy either way? I saw on Steve’s VLOG that he suggested leaving them off.
FX barrel O-rings, On or off?
- Thread starter igolfat8
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At the risk of coming across as a complete smart&&&, try with and without. Everyone's rifle will be different as to tune and barrel harmonics. As they say "Mileage will differ"
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I’m talking about the o rings on the exterior of the barrel liner that wedges the barrel liner against the shroud.
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It was a sarcastic question. Hinting it may or may not improve nor hinder your accuracy. Best to try with or without. I say leave them in. YO!
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It doesn't hurt to leave them attached to the liner as they came from the factory...Some people argue that they like their barrels fully floated and remove them, nevertheless, if they leave the o-rings inside the bushing this defeats the "fully floated argument" and makes it "fully floated with a touching point"...If you remove the o-rings inside the bushing your gun will generally be fuzzier...
Regards,
AZ
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I did an experiment along the lines of this, only different. I epoxied my Impact's slug liner in permintantly. No o-rings and (tried) for a solid barrel. The goal was to stop any harmonic whip differences between the barrel and tube. There was no change in accuracy. So my conclusion was that if the o-rings are holding the barrel fairly rigid then it will shoot the same as if both parts were one.
Now, if you leave the o-rings out of the liner and tube system there is the possibility of nodal movement and or barrel whip inside of the tube which could effect the accuracy and you will have to tune for that. Also, keeping them out could easily effect change based on ambient temperature, air pressure, projectile weight, etc.
My next experiment with these parts is to carbon wrap a slug liner and, because it is so stiff when epoxy cured, see if it changes barrel droop when the moderator is attached. Because, as we all know, barrel droop is pretty prevent on most barrel's with liner's.
Now, if you leave the o-rings out of the liner and tube system there is the possibility of nodal movement and or barrel whip inside of the tube which could effect the accuracy and you will have to tune for that. Also, keeping them out could easily effect change based on ambient temperature, air pressure, projectile weight, etc.
My next experiment with these parts is to carbon wrap a slug liner and, because it is so stiff when epoxy cured, see if it changes barrel droop when the moderator is attached. Because, as we all know, barrel droop is pretty prevent on most barrel's with liner's.
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I have a DreamPup in .22, an Impact in .25 and .30. Yesterday I was bored so I cleaned (and waxed) all of the barrel liners, while I had the liners removed from each one rifle. I noted that the .22 only had 2 O-rings while both Impacts had 4, which I thought was strange. I inspected the .22's shroud and there were no other o-rings inside of it so this is the way it came from the factory. I removed all of the O-rings when I re-assembled them and plan to shoot them today to see what change it made.
I noticed in one of Earnest's video's that he fabricated Delrin donuts and glued them to his liner and then machined a groove to accept the O-ring on the donuts. If he went to all of that work, me thinks its likely better to leave the O-rings in place. Time will tell...
Thanks for all of your input.
I noticed in one of Earnest's video's that he fabricated Delrin donuts and glued them to his liner and then machined a groove to accept the O-ring on the donuts. If he went to all of that work, me thinks its likely better to leave the O-rings in place. Time will tell...
Thanks for all of your input.
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@igolfat8 Earnest once told me that he also uses a couple wraps of tape on either side of the o-rings to keep them in place and I've had great luck using this method. It wouldn't hurt to experiment with using more o-rings on the liner as @TEXAS pointed out. This seems like it might help with accuracy and barrel retention.
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I had a project couple years ago, medical devices - instrumentation...to create a process of epoxying electro-mechanical parts together. This was a several months of team work, the precision was expected in sub microns. The "epoxy engineer" was trying out a lot of materials for consistent filling and expansions, this how I learned that an epoxy is moving/expanding in any directions when curing, and pushing parts away from expected position.
So, if you permanently epoxied your tubes together not necessarily means they are coaxial in a single centerline. Could be by coincidence ??? but most likely they are not...
From this knowledge point keeping orings (or even putting more orings along the length of the liner) is more safer "floating" the liner and barrel centerlines together.
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I like the idea of trying more...maybe even pairs.
Does anyone know where to find the sizes for the liner o-rings?
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I saw an Ernest Rowe video where he put four o rings in the middle of the barrel and wrapped over them with Teflon tape. Said it made the barrel very rigid.
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