AR-15 Acronym C
C3 - Class 3 (a class of restricted weapons as defined by the NFA, including machineguns, supressors, short-barrelled rifles, short-barrelled shotguns, etc.)
CAA - Command Arms Gun Accessories (manufacturer of accessories and gear for various weapons - AR15)
CAR - Carbine
C.A.R. - Colt Automatic Rifle
CC - Concealed Carry
CCH - Cut Carry Handle (a carry handle cut down to form a BUIS)
CCL - Concealed Carry License
CCO - Close Combat Optic (an optic designed for close range use, typically low power, parallax free and with long eye relief. The Aimpoint M68 is an example.)
CCP - Concealed Carry Permit
CCW - Concealed Carry Weapon
CH - Carry Handle
CH - Charging Handle
CIII - Class 3 (a class of restricted weapons as defined by the NFA, including machineguns, supressors, short-barrelled rifles, short-barrelled shotguns, etc.)
CLE - Compass Lake Engineering (manufacturer of competition service rifles and space guns - website)
CLIN - Contract Line Item Number
CLP - Cleaner, Lubricant, Protectant (all-purpose gun maintenance product - example one, example two, Fiber optic sight three)
CMP - Civilian Marksmanship Program (website)
CMMG - Not an acronym, just a name (retailer of AR-15, parts and accessories - website)
CMT - Continental Machine and Tool (contract manufacturer of AR15 uppers and lowers)
COC - Code Of Conduct (the rules governing your use of this site)
COLL - Collapsible (as in a collapsible stock)
CONUS - Continental United States (the lower 48 states and the District of Columbia, not including Alaska or Hawaii)
CQB - Close Quarters Battle
CQ/T (also CQT) - Close Quarters / Tactical (a 1-3x optic made by Leupold and designed for close quarters battle with some mid-range capability as well)
C&R - Curios and Relics (firearms that are officially recognized as collectible due to some unique quality such as age. The ATF maintains a list of qualified C&R firearms that C&R license holders can purchase via interstate commerce without the services of an FFL dealer. More information)
CTR - Compact/Type Restricted (an adjustable carbine stock made by Magpul, with a friction lock feature)
CYA - Cover Your Ass
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WAG - Wild Ass Guess
WECSOG - Wile E. Coyote School Of Gunsmithing (unconventional, unprofessional [although not necessarily poor quality], make-do with what you've got gunsmithing - usually done at home with few tools, often involving a file and/or hammer)
WOA - White Oak Armament (retailer of AR-15 parts - website)
WOP - White Oak Precision (builder of custom AR-15 and AR-10 uppers - website)
WSSM - Winchester Super Short Magnum
WTB - Want(ed) To Buy
WTF - What The F**k
WTK - Want(ed) To Know
WTS - Want(ed) To Sell
WTT - Want(ed) To Trade
WWB - Winchester White Box (In AR-15 context, Q3131A ammunition made in Israel to M193 specifications - relatively inexpensive but reliable general purpose ammo)
XCR - eXchangeable Caliber Rifle* (Robinson Armament's modular battle rifle, originally intended as a SCAR contender)
XM193 - M193 ammunition packaged for sale to civilians (may fail to meet some aspect of military standard - see the Ammo Oracle)
XM8 - Designation of a modular weapon system that may replace the M16 family of rifles. Adoption of the XM8 is uncertain. (brochure, overview)
YHM - Yankee Hill Machine (manufacturer of rails, mounts, forearms, sights and other AR-15 accessories - website)
YMMV - Your Mileage May Vary
Z - Zero (marked on some A2-style rear sight elevation knobs to indicate the position at which the knob should be set when establishing a battlesight zero on a 25-meter range according to standard military doctrine)
ZM - Z-Man or Zitta-Man {Weapons} (manufacturer of the LR-300 op-rod gas system upper/rifle and LR-300/AR-15 accessories - website)