Anyone made their own crosman metal breach ?

[TonyL]

Very best of luck with these, JB.

[evert]

This thread inspired me, so I started drilling the alu rod today. (the drilling of the center holes is the fun part, the rest of the machining will happen when it happens)
Metric tools limit me somewhat, reamed the bolt hole to 7mm, but I have to hone the barrel hole out a bit to get good barrel fit, as the barrels seem to be a fraction larger than 11mm.

I'm thinking to make a long rod that can be fitted with a HSS bit to machine the bottom radius with the breech mounte on the lathe top slide.
It will probably flex a bit, but should be possible if I go slow.

[Shed tuner]

evert, a round nose milling cutter is the way to go for the underside - I got mine for less than a tenner from e6ag