Lapping and Polishing barrels

Forums Other Parts, Accessories, & Equipment Lapping and Polishing barrels

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    AZBOBCAT
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    Open up the bore of the end cap you can take a dowel or a transfer punch with some sand paper wrapped around it and take some material out and try it till you get good groups. Or just take the next size drill bit to it.  I have seen this on a couple FX guns that use that end cap. Like on the Bobcat and verminator one piece ldc.

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    hsnmz
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    @FastEddie yes i have also tried pushing the pellets and it took some effort to push them through the breach. But the pellets came out the barrel without any damage.

    @azbobcat there are no clipping marks on the shroud end cap. I have also shot it removing the shroud end cap but the groups were still the same as with the cap. I am thinking of marking the inside of the airstriper with a black marker to check for clipping.

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    Deleted Account

    Thanks AZBOBCAT. I’ll try that.
    hsnmz- was this picture with just the airstripper on?
    .html
    My groups were very good when I had the shroud and airstripper on with no end cap, but ours are different. Although there were no signs of clipping, the pellets must be just grazing the endcap enough to send them spiraling. I’m gonna do some more testing today

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    hsnmz
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    The last pic in my post is with the airstriper on the barrel but without the shroud. I have discovered that the pellets are clipping the airstriper very slightly. But they still group very well. As soon as I put the shroud back on the group widens.

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    Erik
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    Have not read entire thread but my barrle is polised with JB bore paste and it works perfectly

    42m 5 shot

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    Dartagnan
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    FastEddie, one thing we haven’t seen a picture of is your endcaps.  I thought you posted a picture of your Wildcat.  Can’t seem to find it now.  How many do you use? 

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    Deleted Account

    One moderator and endcap permanently together with red locktite

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    hsnmz
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    What I have found is that the pellets are clipping the airstriper very slightly. But I fail to understand that why the accuracy is bad only when i fix the shroud over the airstriper. Without the shroud its shooting perfect.

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    Mr.Gadgets
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    How do you push a pellet through the barrel of a Wildcat?  Which direction? There is no opening to go from the breach to the muzzle, or do you have to remove the bolt first?

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    Deleted Account

    To check if there’s damage to the pellets at the breech load a pellet and remove the mag then push a wood dowel down the barrel from muzzle to breech . To push a pellet out from breech to muzzle you have to remove the barrel.

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    nvelkhunter
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    FastEddie, could pushing the pellet back out the breech cause damage to the chamber o-ring (D1 in WC parts diagram)?

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    nvelkhunter
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    Amazed gun groups with even the slightest clipping/grazing. Worse with shroud indicates shroud is possibly further offsetting stripper and causing greater grazing?
    Is shroud tube end out of round? Try rolling on flat surface to check for an distortion.

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    Deleted Account

    I must have pushed 30 pellets back out and the oring is still fine.

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    AZBOBCAT
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    Hsnmz just because you do not see a mark does not mean you have no contact if it was contacting bad groups would be huge. Take a little from the stripper also if it is tight. Some end caps have a hole the size of a 25  cal for the 22. And it really does nothing for the sound but guarantees you will not get contact. 

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    Mr.Gadgets
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    “AZBOBCAT”. Some end caps have a hole the size of a 25  cal for the 22. And it really does nothing for the sound but guarantees you will not get contact. 

    
AZ,
    What do you mean by”And it really does nothing for the sound”?  Are you saying, it will now, NOT reduce the sound at all?
    Thanks for clarifying.

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    ajshoots
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    You can open up the bore of an ldc, baffles, etc for the sake of eliminating clipping without that larger bore size making the ldc less effective. I have opened the bore on ldc’s without having any impact on effectiveness of the ldc. If there was a change in sound, my ears can’t tell.

    I am sure there is a point when a larger hole will make the ldc less effective, but for trying to eliminate clipping, opening up the bore a small amount seems to have little to no detrimental effect. I have used a .30 ldc on a .25 that seemed to work just as well as an ldc made specifically for .25.

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    steppenwulf
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    +1
     

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    Daxx
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    This is awesome!  You’ve got me wanting to try and polish my Vulcan CZ Barrel.  I’ll admit, I’m scared to do it though, but if there is a chance it will improve accuracy, then it is probably worth a try.  My fear is it will make accuracy worse and there is no going back.  AJ you should make a video of your process for us.

    Thanks!

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    JoeWayneRhea
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    I’ve seen the results of Aarons work and I’m a believer ! I polish my barrels as soon as I get the rifle in used or new .. I spent some time years ago at Shilen Rifles here in Texas .At the time a very popular aftermarket barrel maker . Anyway I always thought of a rifles barrel as something that you should be ever delicate with to prevent damage.
    When I saw how they lapped ( polished ) a barrel I was shocked ! There were two Big guys pushing and pulling a gritty mop thru the barrel like they were hand sawing down a tree .
    They used 2 different grits and them poured a strong solvent down the barrel to remove any left over compound and then squirted oil inside and went to the next one .
    Mr Shilen said its almost impossible to damage a gun barrel by the normal owner as LONG as they don’t damage the crown . The steel in gun barrels are tougher than most guys credit them to be . Yes an airgun barrel isn’t subjected to the kind of pressures that a Powder Burner is but its still tough.
    If your gun fouls to quickly , or just want to make sure you are getting the last bit of accuracy out of it why the hell not ??!!
    I’ve never heard of a guy saying polishing his bore did anything negative . And its kinda cool when you finish seeing how shiny it is after your hard work .

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    zebra
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    “JoeWayneRhea”I’ve seen the results of Aarons work and I’m a believer ! I polish my barrels as soon as I get the rifle in used or new .. I spent some time years ago at Shilen Rifles here in Texas .At the time a very popular aftermarket barrel maker . Anyway I always thought of a rifles barrel as something that you should be ever delicate with to prevent damage.
    When I saw how they lapped ( polished ) a barrel I was shocked ! There were two Big guys pushing and pulling a gritty mop thru the barrel like they were hand sawing down a tree .
    They used 2 different grits and them poured a strong solvent down the barrel to remove any left over compound and then squirted oil inside and went to the next one .
    Mr Shilen said its almost impossible to damage a gun barrel by the normal owner as LONG as they don’t damage the crown . The steel in gun barrels are tougher than most guys credit them to be . Yes an airgun barrel isn’t subjected to the kind of pressures that a Powder Burner is but its still tough.
    If your gun fouls to quickly , or just want to make sure you are getting the last bit of accuracy out of it why the hell not ??!!
    I’ve never heard of a guy saying polishing his bore did anything negative . And its kinda cool when you finish seeing how shiny it is after your hard work .

    
If the process removes enough material to make a noticeable difference to accuracy, is there not also the potential to make it uneven by applying too much pressure on one side etc? Or does that not matter?

    is there any reason why they don’t do it at the factory?

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