As you say Barry, the pistol grip addition was done by someone with a lot of skill. In a way it balances the look of this rifle really nicely, to my eye.
I think the rear sight is a later model, taken from a post-1919 rifle.
It sounds like the piston seal needs some attention although I have had a few vintage BSAs that show very little sign of compression during the "tap up" test, yet somehow generate quite good velocities when a pellet is involved!
If you find it impossible to get hold of a .177 rod Down Under let me know and I'll send you one over.
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The Vintage Diana Forum
The Vintage BSA Forum
