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Bsa/gamo Magazine Jamming

Discussion in 'Anything Airgun Related' started by daz462, Nov 14, 2021.

  1. daz462

    daz462 Engaging Member

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    Hi everyone,

    Recently got myself my first PCP, which is the GAMO GX-40. The thing is a laser so I'm very happy, however, I'm having an issue with the magazine. This is supposedly the '6th gen' BSA/GAMO 10-shot magazine, and mine is in .177.

    When inserting the mag and pushing the bolt forward for the 1st shot, everything is extremely smooth, happy days.

    The problems appear when the magazine is rotating. Something seems to misalign during rotation when I pull the bolt back because often, I cannot push it forward, and I have force the magazine out & what I find is a deformed pellet inside the mag.

    This was happening every 3 shots.

    I'm sending the mag back to my gun shop so they can take a look at it & possibly send me a replacement, but now I'm thinking, could it have been a bad pellet fit? I'm using JSB exacts 4.5 8,44 gr.

    What do you guys think? What kind of pellet or pellet size/weight did you find works in these mags? Could it be because it's a 'softer' pellet and easier to deform?

    Any help is greatly appreciated!
     
  2. ShotOnTarget

    ShotOnTarget Engaging Member

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    I have a GX40 and I had an issue with what I think were Crosman pellets where they were getting chewed up in the mag, I think at the time I decided that the pellets were a bit too short. But I switched back to JSB's and they ran fine.
     
  3. daz462

    daz462 Engaging Member

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    Which JSB's please? I have the exact diabolos at 4.5mm 8,44 gr and yeah like you said, the mag is chewing them up.
     
  4. ShotOnTarget

    ShotOnTarget Engaging Member

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    I would have also been using the 8.44 grain pellets. I'll try out a few different pellets tomorrow. Do you have a second magazine you could try?
     
    daz462 likes this.
  5. MrTee90

    MrTee90 Engaging Member

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    I've got a Coyote myself in .177 and had a very similar issue.

    For me it turned out that the O ring was slightly chewed up due to there being a small burr on my pellet probe, so I'd also suggest checking that too and using a small finger file to take off any sharp burr/edge if there is on your probe at all.

    Also, I find that back filling the magazine helps massively and since these two small changes, I haven't had a jam/issue since.

    Hope this helps
     
    daz462 and Bearded Sniper like this.
  6. rabbitwrecker

    rabbitwrecker Black Latex Matters...

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    Yet another quality product from Barcelona Small Arms... :facepalm:
     
  7. timmytree

    timmytree Top Poster

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    Do you mean the company that came way above HW and a whole raft of others in the reliability survey? :D
    Chances are it's the pellets not seated correctly in the mag. A tap face down on a firm surface normally sorts it.:thumb:
     
  8. MartinC

    MartinC Engaging Member

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    As above, load the mag then tap face down to seat the pellets, it works
     
  9. Steptoe

    Steptoe Engaging Member

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    I also back fill the mag & dont have any more problems now with the Jsb 8.44g.

    Prior to back filling, it would jam now & then, because i think there a short pellet but now i dont ever have a problem & yes as you said, its very very accurate & a cracking buy at the price !

    Cheers
     
  10. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    Keep the mag and bolt O-ring slippy:thumb:
     
  11. Bam

    Bam Engaging Member

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    Like others have said put pellets in skirt first from the rear in the mag if this is your preferred pellet no more problems ,or I found also that jsb exact heavy cycled just fine due to being a longer pellet and still extremely accurate but a little loopy to my preferred aadf
     
  12. daz462

    daz462 Engaging Member

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    Thanks a lot! I don't have one at the minute, but I have ordered a spare (my are they pricey for what they are) & I'm sending this one back for a replacement.
    Very useful thank you! To check out the pellet probe I suppose I just slide the bolt forward a bit until the probe is visible in the mag space?
    Thanks guys for suggesting back filling. How far do you push the pellet in when filling them from the back?
     
  13. Bam

    Bam Engaging Member

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    Just till its sitting its front of the oring buddy
     
    daz462 likes this.
  14. Mice!

    Mice! Very Active

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    How are you working the bolt? What position is the gun in?
    When I take the magazine out I have noticed that this can happen.
    Screenshot_20211115-121558_Gallery.jpg
    This would be with the barrel pointing upwards so the pellet can drop backwards in the mag, try to keep the rifle pointing down or level when you are loading.
    Your magazine should look like this when you load it.
    Screenshot_20211115-121549_Gallery.jpg
    Theses are JSB heavies, I would say they sit upto the Oring, it's only as the magazine starts to turn that it allows the pellet to fall back.
     
    daz462 likes this.
  15. Patrick

    Patrick Donator

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    What you're experiencing usually happens with short pellets such as Crosman or Accupell pellets but i don't think i've experienced it JSB Exacts. But i use H&N FTT in my BSA PCPs as they the most accurate and i can't honestly remember having a single jam with them.
     
    daz462 likes this.
  16. daz462

    daz462 Engaging Member

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    Hey, thanks for your response. I'm working the bolt by lifting it first and then pulling it back shooting off a bag rest, but I suppose I could have the gun slightly tilted backwards as usually when working the bolt I would put the stock end down to support the gun, so thank you for pointing that out I suppose keeping the gun on your shoulder & level while working the bolt is preferable here as the pellets can slide backwards like you've shown
     
    Mice! likes this.
  17. MrTee90

    MrTee90 Engaging Member

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    Yep that's exactly it mate, simply just push the bolt forwards slightly and you'll see the probe protrude from the action. Once you can see it, feel it with your finger and see if you can feel any rough burrs or edges and if so, a very light filing to simply take the burrs off will help you avoid it possibly nicking the O ring and allowing it to slide through the magazine smoothly. When back filling, I just hold the mag in my left hand and drop the pellet in skirt first and I rotate it with my left finger and thumb for each pellet. For reference I use Accupells in my rifle which are a short pellet too.

    Hope you manage to get it sorted fella and can enjoy it properly :thumb:
     
    daz462 likes this.
  18. Profmorbius

    Profmorbius Member

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    Hi mate, after trying a few different pellets I finally opted for bisley magnums. The lighter pellets didn't perform as well so hope you get it sorted.
     

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