I couldn't stand it. I went back to the range this morning and was there when they opened the gate. Got my favorite lane on the 100 yard range and ran 65 rounds through the Primary Machine barrel. It grouped well but I had an occasional shot a foot high at 100 yards. That wasn't me. I suspected the barrel fit was a little too tight and the barrel just wasn't going 100% in to battery probably on the first round of five. Video showed that to be the case, but it wasn't always the first shot.
When I got home I compared the barrel hood dimensions to the factory barrel. Sure enough, the Primary Machine barrel hood was about 2 mil longer and wider than the factory barrel. It will just take a few hits with a small file to loosen it up a little. At the range, it seemed to do a little better with the very thin Hoppe's Black oil, and that is consistent with a very snug fit. This is a good result, as I can take material off but I can't add any.
When I checked the barrel to slide fit at home this afternoon, the barrel hood dimensions seem perfect to me. The barrel slides in to position easily and there is a little axial play, like a thou or so, so I cleaned out the mating surfaces and put a little light oil on the lock up points and will leave it like that for at least one more range trip. With a consistent lock up, the barrel is definitely good for 4" at 100 yards. My eyes may not always be able to do it, however.
My video recorder drive filled up before I got through the range session this morning, and I missed the last 15 shots, which I think were my best groups of the day so no video unless I can find something from the first two targets worth showing. I'll work on it. I also decided not to clean the barrel, as it only has a little over 100 rounds through it so far. I did borescope it, and the copper and carbon deposits are smooth and uniform, just as I expected them to be. In other words, looks similar to the P-09 barrel, which is exactly what I wanted to see.
