How thin and made of what material? It in a 'normal' apartment building? In any case, a door knob will penetrate 2 layers of dry wall. So will your fist/foot.
Not many apartment buildings built in the last 40 or 50 years with walls that are not reinforced concrete between units. Primarily to keep fires from spreading as mandated by building codes. Internal walls are just dry wall with nothing substantial inside.
"...simply impossible for a projectile to not penetrate a wall..." Nope. No regular bullet will penetrate those reinforced concrete walls between units. And concrete gets harder as it ages.
"...Bookshelves full of books do..." No they don't. A .22 LR will penetrate a solidly stuffed with newspapers box about 2 feet long(been a while) more than half way.
"...Sheetrock(a brand name) is a 1/2” or 5/8” of gypsum dust backed by paper..." Gypsum dust it ain't. It's a paste made of water, gypsum, starch and emulsifiers spread on manila paper.
"...the FBI minimum criteria..." Anything the FBI says is totally irrelevant. The FBI is not, never has been and never will be the arbiters of anything firearm related. They're cops. Cops use what they're issued according to their budgets.
"...V-Max rounds..." Might fragment, but said fragments will be lethal.
Not many apartment buildings built in the last 40 or 50 years with walls that are not reinforced concrete between units. Primarily to keep fires from spreading as mandated by building codes. Internal walls are just dry wall with nothing substantial inside.
"...simply impossible for a projectile to not penetrate a wall..." Nope. No regular bullet will penetrate those reinforced concrete walls between units. And concrete gets harder as it ages.
"...Bookshelves full of books do..." No they don't. A .22 LR will penetrate a solidly stuffed with newspapers box about 2 feet long(been a while) more than half way.
"...Sheetrock(a brand name) is a 1/2” or 5/8” of gypsum dust backed by paper..." Gypsum dust it ain't. It's a paste made of water, gypsum, starch and emulsifiers spread on manila paper.
"...the FBI minimum criteria..." Anything the FBI says is totally irrelevant. The FBI is not, never has been and never will be the arbiters of anything firearm related. They're cops. Cops use what they're issued according to their budgets.
"...V-Max rounds..." Might fragment, but said fragments will be lethal.