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Thanks canross. Sixtus, forward venting muzzle brakes in directing all gases forward (think L.E. Jungle carbine rocket nozzle!) significantly increase felt recoil but at the same time HALVE the...

If you look at the "solvent trap" image. Imagine the inner part of the solvent trap turned down to 18-19mm diameter (whatever the precise 12g dimension is) and screwed onto the barrel insert. ...

I can see someone coming up with a choke insert with a disc at the muzzle end drilled for the appropriate diameter, plus a bit extra for tolerance. Crap suppressor no doubt, but a flash hider, yes....

Those inserts you can buy often centre by means of O-rings. Turning down a barrel to be epoxied inside a brass 12G cartridge would seem to be the way to protect the SG chamber - and cut away a...