It has an M stack in it at the moment. I am going to replace them with an Omega stack or a monolithic if I can get the FRP down enough.

It doesn’t have the long rods but the layout is basically the same as the original, ported barrel, baffles and expansion chamber.

Is the breech block eccentrically machined internally too?
Attachment 65579

Yes, it is.

The blue heat mark is where the metal is very thin and couldn’t dissipate the heat from cutting very well. There would be a hole on the left side if was machined symmetrically. Patchett knew what he was doing when he offset the hole to the right.

Attachment 65580

The barrel is drilled. Real Mk5 barrels are not to be found here. I will fill a barrel with melted lead and drill the holes in rifling groves and melt the lead out when it gets cooler here.