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BSA Mercury


fat_jay
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Hi all, just dug out an old Mercury from my old garage. Seems in good order, but low in power. Is there a service kit available, or somewhere I could send it to get it close to the legal limited? Don't want to spend a fortune, but if I could make it useable while I carry on saving for a PCP it would be handy.

Thanks in advance

Jay

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You need to strip it and check the cylinder, the buffer washers tend to perish and leave a gritty residue which could score the cylinder, I found an old mark 1 last year, got the bits from John Knibbs to fix it up, spent around £50, it`s doing 10.5 fpe, I could get it a bit higher but I will put some pellets trough it first,they are quite basic and easy to work on yourself.

Edited by lineshooter
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Depending how far you're up in Norfolk, if you get the parts, you are welcome to come and use my titan spring compressor and tools, you can fix it up yourself and I'll be around if you need help.

Edited by hyflier
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Depending how far you're up in Norfolk, if you get the parts, you are welcome to come and use my titan spring compressor and tools, you can fix it up yourself and I'll be around if you need help.

The generosity of the guys on here never fails to amaze me, that`s a good offer as you will struggle without a spring compressor, unless you have the strength of the Hulk and as many arms as an Octopus.

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Depending how far you're up in Norfolk, if you get the parts, you are welcome to come and use my titan spring compressor and tools, you can fix it up yourself and I'll be around if you need help.

Thank you, that is very very generous of you!!

After advice from some on here, i am sending the internal gubbins of to Tinbum Tuning for a fettle, and the very nice Mr Warfe Rat is going to polish my chamber.....or something like that!!.........Hoping thats not a euphemism!!!!!!!

Thanks everyone for your help......Next question, the scope touches the top of the rifle, i guess thats not ideal, can i get longer scope mounts? (if thats the right name for them)

Jay

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Jay, if the breech seal has perished, it's a decent bet the buffer washer has too. If you fire it with the buffer washer defective, you will break the piston head pin. Get it in bits and renovate it properly.

 

(Please?) :)

 

You may get away with the piston O ring being ok, but while it's in bits..............

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These guns are worth looking after and are capable of performing well if treated properly. I have the Mercury S in .177 (rare) and it will shoot sub 10mm groups at 25 yards with the right pellet. If you have a .177 version you need to try as many different pellets as you can because BSA seemed to have made their barrels slightly bigger than most others-a lot of modern pellets drop about 1/2" down the barrel-Air Arms field drop down but seem the most accurate in mine anyway. As for mounts-you can buy dedicated BSA one piece mounts from Sportsmatch or use a pair of "reach forward" mounts but with the offset mount reversed and nearest the trigger.

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