[mountainlion]

A flack vest is filled with fiberglass strands that catch the sharp irregular shapes to protect the wearer. The so called cop killer bullets were hard with a Teflon coating that would help penetrate.

[Turbopilot]

A flack vest is filled with fiberglass strands that catch the sharp irregular shapes to protect the wearer. The so called cop killer bullets were hard with a Teflon coating that would help penetrate.

Complete nonsense. Many years ago some manufacturers experimented with steel bullets to increase penetration. The hard steel would wear out barrels much faster than softer copper or lead, so the bullets were coated with Teflon to prevent barrel damage. The MSM called these "cop-killer bullets"; the denser material may have been better at penetrating body armor but the Teflon didn't have a thing to do with it.

[Sparticus]

A flack vest is filled with fiberglass strands that catch the sharp irregular shapes to protect the wearer. The so called cop killer bullets were hard with a Teflon coating that would help penetrate.

Actually, the Teflon was only added to protect the rifling of the barrel. The bullets were so hard that they scored the bore without it.

[Lazamataz]

The so called cop killer bullets were hard with a Teflon coating that would help penetrate.

Negative. The teflon coat was meant to prevent barrel damage. The round was hardened, and would rip up the barrel. The teflon did no penetrating and aided in no way.

Common mistake.