Highest known Sterling L34A1 - Mk5 ?

[Peter Laidler]

There's a rule of thumb that the FREE area inside the silencer casing (that's the volumetric FREE area and not including baffles etc etc0 must be 27 barrel volumes. Don't quote me on the 27 figure, it's from memory. But it's all to do with the mathematical physics of it all. Someone PM'd me about the mechanics of the Patchett muzzle cone earlier so I'll describe the theory and practice tomorrow. Sure I said about it some time ago.........