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project bsa murcury advise & thoughts please

Discussion in 'Anything Airgun Related' started by peterpan, May 31, 2014.

  1. peterpan

    peterpan Engaging Member

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    Location:
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    just got myself a mk3 22 bsa murcury today for 45 quid to give myself a project never had one of these before and i cart believe how good it is to say there is hardley any breech seal its still shooting a very consistant 9ftp how much difference in power will a new seal make there is no dout im getting a new one was just curious because if it goes up to about 10-10 half ftp then i may leave the internals alone if not ..i wanted to know the best way to get that unusual looking trigger block off at the back got a feeling it will need a good wack looks like the blacking is paint and its got a awful varnish job which is going to be a nightmare doing by hand also what are good pellets for these tried some 5.52 aa field and they drop in quite a bit will need a large pellet although i was getting good groups so any advise on pellets would be an help also got a smart pair of vintage nikko sterling silver crown japan 4x32 with a T ret anyway any tips on getting the trigger block off safely would be helpful im putting some photos up now and then when its done so if anyone can give me any tips to help me get this lovely rifle looking smart please tell im a novice at this....would just like to drop this one in aswell cos i was really surprised when i did the test.i put a pellet on the scope turret and fired to see how smooth the recoil was cos it felt quite sweet ..the pellet only slightly moved nearly as good as my 97k do you think it may have been tuned in the past???or because of relitivley low power .many thanks pete View attachment 97367 View attachment 97368 View attachment 97369 View attachment 97370 View attachment 97371 View attachment 97372 View attachment 97373
     
  2. larryking28

    larryking28 Busy Member

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    BSAs bluing still looks like paint to me :)
    The rear block is screwed into the cylinder.
    You might need to dismantle the trigger assembly to remove the block but the trigger assembly is pretty simple and only has a few visible moving parts so shouldn't be too bad in theory.
     
  3. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    Looks like a decent score for £45 - like the 'scope :)

    The breech seal can potentially make a lot of difference to output; they turn the consistency of waxy toffee and disintegrate with age - the guns will make next to no muzzle energy if they're completely shafted. I've known sub 1ftlb Meteors make 7ftlb+ with the addition of a new seal.

    The rear block "just" screws off - there's a hole for a tommy bar running across the back block, although I usually just put the trigger assy in the (padded) vice and try and turn cylinder by hand. Remember that it'll all be under a fair bit of load..

    Best bet as you say is to hold off until the seal's fitted and take it from there. The back block can separate from the threaded portion inside the cylinder (which makes it a swine to remove) so best left alone if all's running smoothly ;)
     
  4. peterpan

    peterpan Engaging Member

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    Location:
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    i hope thats the case mate and a new breech seal will put power upto about 10ftp that will do me for an old bsa break barrel like i say its lovely to shoot...but if not it will have to come off the back block that is looked on you tube of some gunsmith doing the same job to an air sporter and he had hand made tools to take it off he had to give it a good wack with a bar ..also is it normal to have such a wide pellet breech will that make any difference pellets droping about 4mm into the barrel..im sure i had a meteor what was the same..wonder if the bsa pellets will be best suited never tried any they look cheap so iv never bought any thanks again pete ...just getting stuck into the stock got a sweat on already could of bought a sander other day off a car boot for 2 quid..cart believe how tight im getting
     
  5. Patrick

    Patrick Donator

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    The BSA Mercury was my first air rifle back in 1976,the best pellets were probably Eley Wasps or BSA Pylarms(same pellet) but Marksman 5.6 mm performed quite well despite them being a cheap pellet.Strangely RWs Diablo's also went quite well despite them being 5.5 mm so you might find Superdomes perform okay.Marksman are still available and the current wasps though not as good quality may work providing you get the 5.6mm ones(blue tin).The back trigger block is usually very tight and you may need to heat the cylinder up to remove it but you will almost certainly have to clamp the breech in the padded jaws of a vice to remove it and use a snug fitting tommy bar in the hole provided in the trigger block.When you do it back up just do it hand tight or you'll have the same problem again.If the block doesn't line up when it's hand tight just rub the end of the cylinder against some emery cloth on a flat surface till it does.A mercury working properly in standard trim i.e not tuned should put out about 9.5-10 fpe.
     
    Last edited: Jun 1, 2014
  6. oliver13

    oliver13 Donator

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    Defiant Vintage pellets are made 5.6mm to fit the older .22 barrels & are excellent, which you can't say about Wasps, but 'Domes aren't bad either.

    If you do strip it there's a buffer washer behind the piston head, made of the same self destructing plastic as the breech seal, it's worth replacing it while your in there - this is one out of a Scorpion pistol that's gone terminal: [​IMG]

    With a normal spring the pre load isn't too ferocious, you should be OK controlling it with just body weight, but if you wanted to stuff a Titan in there all bets are off...
     
  7. T 20

    T 20 Busy Member

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    I'm over here, Dave

    I'd say definitely strip it down Oliver

    Once the buffer washer has rotted the piston head is retained by just a small cross pin, after using for a while the cross pin will shear leaving the piston head in the end of the cylinder.

    Another good reason for stripping is to replace the O ring piston washer which also degrades with age, the standard piston washer is 1 1/8" OD X 1/8" section.
    If the piston feels tight with the standard O ring then it's worth trying a Standard Meteor sized ring at 1" X 1/8" cross section.

    The breech seal is best replaced with one for a Weihrauch 35/80/85/95 as these give a much better seal than the BSA one.



    All the best Mick
     
  8. peterpan

    peterpan Engaging Member

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    Location:
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    thanks for all your input gents dug out the breech seal and its not even a proper seal its like a cut down piece of plastic so still waiting for a new seal striped the stock and gave it 3 good coats of american walnut wood stain ive also striped/sanded the barrel down and its all blotchy and dont want to budge how will i beable to polish it out i have the same problem with a bsa supersport black blotches how can i polished these out to a nice shinny silver ready for bluing? or may go for the carbon wrap if not ....what do you think of my work so far its my second attempt at refinishing a rifle stock im going to give it a coat of wax for protection i tried polyurithain clean varnish last time as i like a shine but there was to many dust bits dried into it when it dried so had to sand down again ..thanks again pete View attachment 97519 View attachment 97520 View attachment 97521 View attachment 97522 View attachment 97523 View attachment 97524 View attachment 97525 View attachment 97526
     
  9. Mike C

    Mike C Member

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    I really like the stain you have used, much nicer than the original orangey BSA colour.
     
  10. peterpan

    peterpan Engaging Member

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    Location:
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    thank you very much im quite pleased with it myself just got to try and see if i can get the black striped properly and reblued and i would like to leave the trigger block section polished silver ...quite a nice smooth shooting springer with a nice predictable trigger .thanks again pete
     
  11. 1961nuffield

    1961nuffield Honorary Member

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    Don't carbon wrap it, keep it blued or painted!

    John
     
  12. mijod

    mijod Well-Known Member

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    Hi i've just bought a mk1 mercury needs stock stripping definatly going to use your american walnut oil stain, your stock looks just right, gonna get metalwork blasted but not sure about what to paint it with, also need a rear sight
     
  13. darklord

    darklord Can’t beat a tx200 at 30m

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    After doing a mk2 earlier in the year I'd say leave it alone unless you want to loos teeth eyes and hands. And don't go near a Titan in it you'll never get it back together
     

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