Eric "the Red" Holder and BATF at it again. Here is the link for the (2) page statement, but here are some excerpts.

Last week’s federal court summary judgment against the government in Mance v. Holder struck down a key provision of the Gun Control Act of 1968 (GCA) requiring all interstate handgun transfers to pass between FFLs in each state was struck down as an unconstitutional infringement of the 2nd Amendment under both strict and intermediate scrutiny, as well as on 5th Amendment Due Process grounds

Like any wounded beast, of course, the BATFE faced an existential imperative to reassert their authority, and late Friday afternoon (in a move that’s long ago become standard operating procedure for the Obama administration) they did so with a vengeance.

A provision of the GCA was intended to ban the availability of armor piercing ammo in pistols–these bullets were characterized as “cop-killer” bullets, because of their potential ability to pierce a police officer’s “bullet proof” vest.

In recent years, a great many handguns have been built based on the underlying design of the very popular AR-15 rifle. These AR-based pistols fire the same ammunition as the AR rifles–most commonly 5.56 x 45 or .223 Remington (not quite exactly the same, but close enough for our purposes). (The featured image atop this page, sourced from the MDShooters gun forum, shows a whole and cross-sectioned 5.56 x 45 round.)

One of the most common types of 5.56×45 ammo is the type specified for military use, commonly referred to as M855 or SS109. It is this round that the BATFE is attempting to effectively ban, by suddenly claiming it as an armor piercing round that may be used in a handgun.