AR-15 Acronyms O - Gun Accessories
OAI - Olympic Arms, Inc. (manufacturer of various AR-style rifles - Gun Accessories)
OAL - Overall Length
OBO - Or best offer
OD - Olive Drab (that green color the army is so fond of)
OD - Outside Diameter
OEG - Occluded Eye Gunsight (a sight that projects a dot to the eye but through which you can't actually see the target - hence the term "occluded". It works via binocular vision whereby one eye views the target directly, the other eye views the dot in the sight, and your brain merges the two images together)
OFS - Out Freakin' Standing (substitute for "Freakin'" as desired)
OICW - Objective Individual Combat Weapon (possible M16 replacement weapon system that can fire both normal bullets and airburst fragmenting munitions. The XM8 is based on the normal bullet firing component an early OICW entry. Overview)
OTM - Open Tip Match (a type of hollow point bullet designed for long range accuracy)
OTJT - On The Job Training
OPS - Operations (see also OPS-INC just below)
OPS-INC - O. P. Seberger Incorporated (manufacturer of muzzle breaks and silencers for the U.S. military - website)
OTAL - Offset Tactical Aiming Laser (a laser sight mounted alongside the barrel/handguards/carry handle)
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AR-15 Acronyms D
DC - Dust Cover
DCH - Detachable Carry Handle
DCM - Director of Civilian Marksmanship (replaced by the CMP)
DD - Daniel Defense (manufacturer of free floating railed handguards, slings and accessories - website)
DD - Destructive Device (an explosive, incendiary, or poison gas device as defined by the NFA)
DEWAT - De-activated War Trophy (a machine gun whose barrel has been plugged and welded to the receiver and whose chamber has been welded shut, rendering it unserviceable but still subject to the regulations of the NFA)
DIAS - Drop-In Auto Sear (a device used to convert a semi-automatic gun to full-auto. By itself considered to be a machine gun under the NFA, and unregistered ones are illegal to even possess with, let alone install in, the guns they convert)
DILLIGAF - Do I Look Like I Give A pistol grip
DIY - Do It Yourself
DOD - Department Of Defense
DPMS - Defense Procurement Manufacturing Services (builder of AR-15 rifles and supplier of parts and accessories - website)
DRMO - Defense Reutilization Marketing Office (an office of the DRMS - website)
DRMS - Defense Reutilization Marketing Service (a government agency that disposes of excess property received from the military services - website)
DSA - D.S. Arms (specializes in FAL rifles, but also sells AR-15 parts and AR-15 accessories - website)
DU - Democratic Underground (a site for the exchange of what are considered liberal ideas - not friendly to your Second Amendment rights)
EA - Essential Arms (manufacturer of AR-15 lowers, stocks and parts - website)
EBR - Evil Black Rifle (a twist on the gun-grabbers' propaganda, embraced by supporters of the RKBA to both endearingly and sarcastically refer to military-style rifles such as the AR15 )
EE - Equipment Exchange (a board on this site for buying, selling and trading equipment)
ETA - Edited To Add (an explanation of what was added or changed when a member edited his or her post)
ETA - Estimated Time of Arrival (in conventional usage, but see also "Edited To Add" Fiber optic sight)
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