Lapping and Polishing barrels

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

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    hsnmz
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    pushed a pellet through the un clean barrel




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    ajshoots
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    Not able to see your pictures?

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    hsnmz
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    Have inspected the barrel after a thorough clean, everything seems to be fine, no scratches or pitting. could not check the crown as I was unable to take the shroud off. pushed a pellet through. The part where the twists/grooves start required some force to push through.

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    Deleted Account

    hsnmz. Hi. You should remove the airstripper just to make sure the pellets aren’t clipping it. Once you remove the endcap and any moderators its the piece that fits into the end of the shroud and is screwed onto the end of the barrel. Just to eliminate it as a suspect.

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    hsnmz
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    Mine has a single piece shroud. I have tried pretty hard to remove it but it didn’t move. So not sure how can I remove it. Dont want to use any tools as that may damage the finish.

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    Deleted Account

    The shroud isn’t going to unscrew until you unscrew the airstripper. It might look like its part of the shroud but its separate and screwed onto the barrel. The shroud is just a tube, open on each end. I’ll go take some pictures so you can see what I’m talking about. Once you remove this take some shots and see if the pellets are still spiralling.

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    Deleted Account

    After you unscrew the endcap and any moderators is this what yours looks like?

    Now you have to unscrew the threaded piece. Theres not much to grab so wrap a rag around the threads and turn. Here’s a pic of the air stripper.

    Here’s one of it removed from the shroud.

    Now you can unscrew the shroud.

    Here’s a pic of the airstripper screwed onto the barrel without the shroud.

    The easiest way to reassemble is to screw the airstripper into the moderator and endpiece then screw that whole assembly into the shroud and onto the barrel.

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    Deleted Account

    I also noticed these two deep gouges in your pellet. The first picture where you pushed a pellet through the unclean barrel. Check the inside of your airstripper when removed. Also shoot a couple with it removed to check for spiraling. Its gonna be loud.

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    Deleted Account

    I just looked on AOA site and now I know what your shroud is like. If you can unscrew the endcap and the shroud still won’t turn use a blowdrier or heatgun on the end of the shroud near the breech to loosen the locktite .You have to get the endcap unscrewed first as it is the airstripper and screws onto the barrel for proper alignment.

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    hsnmz
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    Here’s how mine looks, it’s a single piece

    The only thing that can be removed is this end cap

    That is the air stripper inside the shroud.

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    Deleted Account

    Ohhh. Ok. Somehow the airstripper needs to be removed. The pic is a little blury but is that a hole in the outer area? If so is there another opposite? And if there is.. needle nose pliers

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    hsnmz
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    yes there are two holes but i think that will only unscrew the seat the end cap screws on to. I think the shroud tube just slides over the air stripper and is screwed on to the attachment at the rear end. It is locked tite as it’s not moving despite applying force.

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    Deleted Account

    Its blue locktite which is removeable. Its alot easier to remove with heat applied. I was able to break mine free with a blow drier pretty easily. No need to put new locktite once removed. My hammer spring adjuster is really locktited (excuse my made up word) down . I’ve tried blow drier and a heatgun. Now I’m ready to take a torch to It.

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    hsnmz
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    ok will give it try with blow drier and update here, thanks

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    hsnmz
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    Thanks for the tip. Took the shroud off using a blow drier. Again used the blow drier to remove the air stripper from muzzle end. Visually there seems to be no clipping marks on the air stripper. Barrel crown also seems ok. Will test the pellets as now the exact cause of the inaccuracy will be easier to identify and will update here.

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    Deleted Account

    Good to hear.

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    amoxom
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    Were those JSB 18.1 pellets or the 15 gainers going at 880fps? I thought the JSB 18.1’s get unstable beyond 860???
     

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    Deleted Account

    Those are .25 caliber 25.4 grain pellets

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    hsnmz
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    Today I tested the groups at 50 yards with and without the shroud.

    This first group is 8 shots with shroud at 50 yards

    Tried some lubed pellets with shroud at 50 yards

    This is shots with the shroud and air striper removed

    This is 5 shots with air striper reinstalled on the barrel

    Above results indicate that the shroud has some issue but have no idea what exactly is the issue and how can it be corrected.

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    Deleted Account

    Oh my god hsnmz! I’m going thru the exact same thing! I got a new barrel like a month ago because my first one had pitting on the inside, but it was very accurate. (I should have kept it!) So I’m thinking my new barrel just needs to be broken in because it hasn’t been very accurate. I just received my Casio ex zr 1000 and filmed some groups and I couldnt believe the pellets were spiraling! Today I took the airstripper and endcap off and the groups were better. Then I put just the airstripper back on and my groups were awesome! The 25.4 were shooting really good and the 33.95 were better but some pellets still had a wobble. I started a thread on this in general airgunning- pellet spiraling. I think our pellets are getting damaged in the breech area where the brass meets the steel barrel. I’ve pushed a few pellets thru and the skirt gets caught in the groove there and takes a good amount of force to push past it. Check it out.

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