The current Military round used to replace M193 is M855 .556 NATO 62gr SS109. This round has better penetration when compared to M193. I believe NATO adopted this round in 1977. M193 is used by "some" LE and "some" foreign military units.
The last place that I want to be when a firefight is raging is behind a layer of brick, vapor barrier, insulation, sheetrock and paint. Now sand filled walls or armored plate in the walls... you should be good to go.
LLS
You get bonus points for knowing what abrasion resistant steel plate is.