imported post
A few more:
With regard to opinions,
IANAL - I am not a lawyer
YMMV - your mileage may vary
IM(H)O - In my (humble) opinion
With regard to ammunition,
FMJ - Full Metal jacket
HP - Hollowpoint
HS - Hydra-Shok (Federal HPs)
GD - Gold Dots (Speer HPs)
WWB - Winchester White Box (budget yet decentrange ammo)
ACP - Automatic Colt Pistol; a standard classifier of semi-automatic ammunition.
Mag - Magnum. Can also be "mag", which is usually an ammo magazine.
With regard to firearms,
AR - a riflepatterned on the AR-15 (M-16). can also mean "assault rifle" in general, but that will generally be spelled out to avoid confusion.
AK - A rifle patterned on the AK-47.
1911 - a pistol patterned on the M1911A1. This and the preceeding patterns are just that; they are widely produced by many companies and are a class of firearms more than any one model.
SAO - Single-action only. Most of these are 1911-pattern but some Sigs are SAO on a different pattern, and most striker-fired pistols that aren't Glocks are technically single-action as well.
TDA - Traditional double-action. Synonymous with DA/SA. Most hammer-fired pistols that aren't 1911s are TDAs.
DAO - Double-action only. some Sigs and most pocket pistols are DAOs.
With regards to Jeff Cooper,
Rule 1 - the gun is always loaded
Rule 2 - never point a gun at anything you do not intend to destroy
Rule 3 - keep your booger hook of the bang switch
Rule 4 - be sure of your target, and what is around and beyond it.
White - Condition White; unobservant and thus unaware of potential trouble
Yellow - Casually observant for unexpected trouble
Orange - Trouble expected or occurring, source unknown
Red - Trouble imminent or occurring and source pinpointed
C&L - "Cocked and Locked"; Condition 1 of 1911s and some other pistols, the pistol is loaded, chambered and the hammer back, and the safety is engaged.
Israeli - "Israeli carry"; Condition 3 of 1911s and most other pistols, the weapon is decocked with an empty chamber but a full magazine. The Israeli Defense Force (IDF) is trained to carry this way.
With regard topolice procedure,
RAS - Reasonable articulable suspicion. A lower standard than probable cause, it justifies a detention of an individual on the spot for further questioning to develop or refute cause to believe a crime is imminent or being committed. It also in limited circumstances justifies afrisk for weapons.
PC - Probable cause to arrest; the officer must have evidence, not just suspicion, that a crime is imminent, in progress, orhas been completed that would, given time to do so, have resulted in a warrant. Of course it can also be "politically correct" depending on context.
SOP - Standard operating procedure; the code, formal or informal,dictating conduct and police response to a given situation.