I don't know if I'vd ever heard of ASM before just now. I own 2 Walkers made by Uberti I guess that I bought from Cabela's. (one at a time of course. I work for a living) I'vd had them for some time. One of them has never been loaded or shot. One of them I shoot pretty regular. (hunt with it to) Shoot's good, and all that weight help's control the bucking a little. It took me awhile to work out a good load because the round has a tendacy to climb on you. I finally settled on 42grains. That's still a pretty damn good wallop when you bust that cap, but I'vd got lot's of deer (well, a few anyway) and hogs and whatnot with it. The Walker is not as mean and ugly as lot's of people say. It's just heavy and all but it alway's shoots and it is accurate for a long ways out there after you get used to it. I thought about getting some adjustable sights (maybe similar to those found on the Remington .44 target model) put on them for a long time but I didn't know anyone I trusted to do it right, and between this, that and the other I just never got around to it. In the mean time I learned to hit with it pretty good the way it is so I guess I'll keep it the way it is. Besides, if I had the sights changed it may not fit the holster good..I like the Walker. Yeah, it's made by Uberti, I just unleathered it and checked. I couldn't remember if it was Uberti or Pietta...PS..Mine has the spring clip that hold's the loading lever in place. The lever still snap's into place pretty tight and secure. So far I haven't ran into the problem of the recoil making the lever drop..Walker..