Got my covers today. They seem nice, light and trim...and seem to fit nicely. They should NOT slip under fire as the fit is VERY snug.
The covers for my Silencerco Omega 36M (green and gray) in long and short configuration slipped on easily if I slid the cover over the barrel, then pulled on to the can toward the muzzle.
The cover for my AB Suppressors A-10 was a bit more snug. It was more difficult to get started, but a little easier once the can was mounted. I had to twist the cover while simultaneously pushing toward the muzzle. The ribs on the can seemed to give a bit more friction, but I was eventually able to work it toward the end.