Problem Fitting Scope To 1970's Bsa Mercury

[mjr88 50]

Hi all

 

As the posts title states, I am having a few problems fitting a scope and mounts to my late 1970's BSA Mercury .177 The problem is that the mounts keep coming loose, and in some cases, even falling off completely, scope and all.

 

After a bit of investigating, I have discovered that the early BSA rifles had very shallow mount grooves, this in turn causes the problem of scope/mount shift. I have even phoned up a couple of gun shops, and was basically told the same thing. ''We do not recommened a scope mount system for early bsa guns because they have very narrow grooves, and this causes the problem of getting any suitable grip from the mounts''

 

I am only after a cheap scope/mount set up for my Mercury, so if anybody can help me out with this issue it will be greatly appreciated,

 

John

Edited July 14, 2013 by mjr88

[moxy 617]

You could try epoxy the mounts on or take the tube to an engineering outfit and have the grooves re milled a little deeper

[Wildling 520]

As Moxy said above your only real way to correct this problem would be to have the rifles mounting groves re-profiled by a engineer.

 

Or you could try welding the mounts to you rifle.........

[moxy 617]

I don't think welding would be an option as most mounts are ally and the tube is steel.

 

Drilling and tapping could work but de burring the cylinder inside could prove awkward

[Wildling 520]

Wouldn't drilling and tapping require quite a deep hole compared to the thickness of the rifle block ?

[moxy 617]

  On 14/07/2013 at 17:57, Wasted_For_Ever said:

Wouldn't drilling and tapping require quite a deep hole compared to the thickness of the rifle block ?

Not really, you could counter sink the mounts, bore through into the top of the cylinder, tap out the hole, de-burr and polish the cylinder internal, Cut the screws down so they dont poke through into the cylinder and interfere with the piston stroke, locktite and the jobs a good un.

Only one M4 screw per mount would be needed.

 

Getting it machined would be a better option and may only cost £20 cash plus a reblue

[barrywhite 282]

years ago I had webley spot wield a scope rail on my mark3 super target .You could make a scope rail out of metal drill holes through it then wield it to the gun through the holes .Or get a gun with a scope rail and use the bsa with open sights .

[kanny 21,099]

not sure if it would work on your rifle but have you tried a couple of arrestor blocks? another suggestion would be to mod your mounts so there thinner to catch the groove better..... its what we did back in the day when we had scope problems on the old springers..... I think the only main stream air rifle scope back then was a 4x20 these had a one piece thin steel mount if I remember correctly to fit the shallow grooves.

 

atb

 

 

kanny