A couple of weeks ago, I asked Joe (
http://muzzlemack.com/default.aspx) if he could come up with a "smoothie" style muzzle extension about 3 to 3.5 inches long that added no more than 2 inches of length to the barrel and with a restricted exit aperture. Here is the prototype he sent me earlier this week. Just under 3.5 inches. 15.2 mm ID. Inside bore has been reamed smooth to a depth of about 1 inch. A single set screw one half inch from the tapered base secures the muzzle extension to the barrel. Joe made clear to me when we spoke that this was a prototype. The only critique I have is that the finish is just a bit rough with some visible machining marks, and the bluing could be a bit deeper. That said, the macro flash photography accentuates the imperfections in the finish. With just a bit of oil and a wipe down, the muzzle extension, in hand, looks pretty good. The rifle it is intended for is currently in NC, so I don't have photos installed. I plan to put it on a BAM B-26. Hope the 15.2 mm ID is enough. If not, I may send it back to Joe for a bit more work. Certainly can't complain about how promptly he made up just what I had asked for, though.