ASM= Armi San Marco was rather small compared to Aldo Uberti, FLLI Pietta, Davide Pedersoli & C. it was run by then Son in Law of Aldo Uberti.
The Shop had some quite capable artisans , and they often offered pieces the others did not ... outside the main models Colt Army's ,Navies ,SAA etc. & Remington's,
The issue was, QC on many, partly because importers ( Traditions, EMF, Navy Arms, later even Cimarron and for a short time USPFA ) clamored for the the products.... ASM barely kept up.
Traditions and Sportsmans Warehouse, were selling them hand over fist and at discounts even closeouts. I remember prices were
below $100 at these two large lot wholesalers.
ASM could and did make some good guns, If you were lucky and got one, you would have a nice piece.
I had one of their Walkers, it was a nice as any I've seen including 2 Gen. BP series.
American Frontier Arms, Dave Anderson develop the conversions , his were good. There are a fine set shown in Adler's book Metallic Cartridge Conversions.
But, a lot were assembled in Gardone and these more often than not suffered.
However, if and quite often someone did get a gun with issues, Navy Arms, EMF and Cimarron had to take many back on warranty issues. they quit importing them.
ASM finally through in the towel, most of the employees are with the other makers now.