• KingKong33@lemmy.ml
      link
      fedilink
      English
      arrow-up
      2
      ·
      7 hours ago

      Where do you live that 21cm reinforced massive concrete is the primary building material for residential buildings? That’s not common. Regardless, I said most materials. Not all.

        • KingKong33@lemmy.ml
          link
          fedilink
          English
          arrow-up
          2
          ·
          7 hours ago

          If any caliber would be capable of going through that, it would be .50 BMG, but you may have found the exception to the rule.