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Bsa Ultra Multishot Refurbishment

Discussion in 'Technical' started by Powe026, Dec 28, 2020.

  1. Powe026

    Powe026 Well-Known Member

    Messages:
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    Location:
    Orsett, Essex
    Hi,

    My son has a BSA Ultra Multishot which we bought second hand; we replaced the fill valve seals as they had worn out. The gun fires well, but we are having inconsistent loading experience with pellets getting stuck and unable to remove the mag without some kind of force being applied.

    Just wondering once we through this lockdown (December 2020) are there members or companies who could give the gun a full service, we are not confident in a full stripdown and rebuild we are not sure what to look for regarding worn out parts etc.

    The gun is charged from the front and also cocks from the front.
    The fill valve seal had completely perished so not sure how much more of the internals are worn.

    Any advice would be greatly appreciated even if you think it will be uneconomic service.
     
  2. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    Location:
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    First of all,

    does the pellet probe go through the mag smoothly without a pellet?

    What pellets are you using?

    Plenty of skilled people on here that could give your ultra a good service, I’m sure they will chime in.

    Also, the ultra mmc is pretty easy to strip:)



    :thumb:
     
  3. Patrick

    Patrick Donator

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    As Steve say first just check that the probe goes through the magazine smoothly. Is the magazine the latest type with the polymer (plastic) rotor as the earlier aluminium rotor type could be temperamental.
    Even the latest type can be fussy with some pellets due to the position of the 'o' ring that holds the pellets in place in the mag. This usually happens with short pellets as they are not held by the o ring securely when loaded from the correct side. What happens is they tend to fall back if the gun is tilted while cocking it if the pellets you're using are short bodied ones such as Crossman/Accupell or some of the lighter JSB varieties(RS/Express).
    If this is the case the loading them rear end first from the opposite side(front) of the mag can prevent it. Or of course use a different pellet. I use H&N FTT in my BSA PCPs and have never had a jam/mal function. JSB Exact work okay as do some other pellets such as Bisley Magnums, RWS Superfield. it's usually the shorter bodied pellets that can give the problem.
    If the gun is shooting okay apart from that then it's almost certainly down to the pellets you're using or perhaps the magazine if it's the earlier/older type mag.
     
    Last edited: Dec 28, 2020
    Powe026 and sidney like this.
  4. sidney

    sidney Big Poster

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    What he said^^^
    Short pellets in an old type magazine caused me no end of stuck mag problems initially.
     
    Powe026 likes this.
  5. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    Also put a small bit of lube on the probe o-ring. Trust me, it makes a difference:thumb:
     
    Powe026 likes this.
  6. Powe026

    Powe026 Well-Known Member

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    Location:
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    Thanks, Stevie we are currently using Premier .22 5.5mm 14.3g Domed Ultra Magnum by Crossman. I did make sure each pellet was well pushed into the mag before my test.

    The pellet probe is smooth pushing the pellet in, on an empty mag I did have a little resistance, looking at the mag it's not square see the image.
     

    Attached Files:

    Stevie Darling likes this.
  7. Powe026

    Powe026 Well-Known Member

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    Location:
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    Thanks, Patrick looks like I we have the alloy mag so that's probably giving us the issues, the Premier Crosman pellets are new so will look getting some that you have mentioned in your post.
     
  8. Katoom390

    Katoom390 Busy Member

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    The mag stop can be bent to align the hole in mag with hole in end plate it’s out of line in pic I think it’s the little tag above the centre screw.
     
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  9. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    The only pellet I had a problem with was superdomes, but the mag stop definitely needs adjusting going by your picture, and probably causing the problem.

    While it’s apart I would also take some tension of the spring, they are wound to much in my opinion.

    After that, there is another little fix that will make it smooth as a pornstars ass,

    if it needs it:thumb:
     
    Powe026 likes this.
  10. robs5230

    robs5230 Oversprung

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    bsa mags don't like short bodied pellets.
    If it's not that, consider changing the mag O ring. They are sfter all, a consumable part
     
    Powe026 likes this.
  11. SJC

    SJC Shooter and golfer.

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    I’ve got an Ultra MMC I had exactly the same problem if you’ve got the old style mag it will be that.
    I bought on of the new style and removed the indexing pin, I’m no gunsmith but it was fairly easy but a bit fiddly as it’s a tiny pin.
    New mags are about £30+
     
    Powe026 likes this.
  12. Powe026

    Powe026 Well-Known Member

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    Location:
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    Thanks SJC I had one added to the basket yesterday then wasn’t sure if was compatible. I also bent the internal stop pin in the mag forward. Which has made a little difference.
     
  13. SJC

    SJC Shooter and golfer.

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    I looked on you tube there is a video about removing the index pin.
     
    Powe026 likes this.
  14. Patrick

    Patrick Donator

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    Well with the Crossman pellets and the older style(alloy) mag you've probably got the worst possible combination when used together. There's nothing wrong with Crossman pellets they're actually quite a good pellet and perform well in many guns it's just that because they're a short bodied pellet they don'r suit the BSA magazines, hence the jams.
    If you want to try sample packs before committing to one particular pellet then you can buy sample packs from www.pelletperfect.co.uk
    P.S As i' previously said with the Crossman pellets because of their short body you could try loading them into the mag the opposite way, i.e load them tail first from the front side of the mag as opposed to the normal way ,i.e head first from the rear of the mag.
     
    Last edited: Dec 30, 2020
    Powe026 likes this.
  15. Powe026

    Powe026 Well-Known Member

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    Location:
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    Thanks guys we made the adjustments to the magazine. I’ve ordered a new one and changed the pellet, the results are much better. I think we will be able to strip down to service the internals.
     

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