User:Pettifogger/Table


 * Bold number : Was used by the United States military
 * Italic number: For commercial or export sale
 * Bold name : US military designation

Barrel
 * Pencil : Barrel profile where barrel is consistently thin
 * Government : Barrel profile where the barrel is thin under the handguards, and thick when exposed
 * 1:12 : 1 turn in 12 inches
 * 1:7 : 1 turn in 7 inches

Fire Control Group
 * Auto : The selector is Safe-Semi-Auto
 * Burst : The selector is Safe-Semi-Burst
 * 4-way : The selector is Safe-Semi-Burst-Auto

Case Deflector

Rear sight; M16A1-style front sights are a five-position round post. M16A2-style front sights are a four-position square post. Flattop-style front sights are M16A2 front sights


 * A1 : "Field sights" in which the rear sight is only adjustable for windage
 * A2 : Rear sight adjustable for both windage and elevation
 * Flattop : Carrying handle and rear sight has been replaced with a MIL-STD-1913 rail

Muzzle device
 * Duckbill
 * Three-prong
 * Birdcage
 * Compensator : Birdcage with bottom vents closed off

Stock

Until 1985, Colt used an aluminum retractable stock. Colt replaced it with a nylon stock that was identical in appearance. In 2002, the nylon stock was replaced with a new design by Picatinny Arsenal engineer Lily Ko that had reinforced ribs, an angled buttplate, and a rear sling swivel.


 * Fixed A1
 * Fixed A2 : The M16A2 uses a stronger buttstock that is 5/8" longer, with an easier-to-open d=trapdoor.
 * 2-pos : The receiver extension has two positions for a sliding stock.
 * 4-pos : The receiver extension has four positions for a sliding stock.

Handguards
 * Triangular
 * Round
 * CAR :
 * M4 :