This is a start and will take time. We hope to enlist some help from certain folks who have done this elsewhere.
Members Scottryan, Quib and more to follow can assist with questions.
Retro lowers, from the earliest style through A1's, NoDak Spud.
http://www.nodakspud.com/AR%20Lowers.htm
Reproduction Moderators and Grenade rings
Contact member "brick" here for information, he does outstanding work
Jerrell Sharpe, AKA "Heat-n-Beat" - Barrel work, Retro parts, new parts parked to correct color, old parts reparked, etc.
mailto:JRS@outdrs.net
Upper receiver forge codes
http://www.biggerhammer.net/ar15/uppers/
Retro Black Rifle - Tons of reference fo upper & lower, correct parts and a forum as well
http://www.retroblackrifle.com/
Here are the links to Wikipedia which detail the models of Colt AR-15s. The information in these articles has been throughly researched and is accurate as reasonably possible.
If you have anything to add or change please send me (scottryan) an email through this website.
http://en.wikipedia.org/wiki/Ar-15_variants
http://en.wikipedia.org/wiki/M16_(rifle)
http://en.wikipedia.org/wiki/M4_Carbine
http://en.wikipedia.org/wiki/M231_Firing_Port_Weapon
http://en.wikipedia.org/wiki/CAR-15
http://en.wikipedia.org/wiki/Colt_Automatic_Rifle
A little history behind weapon "Rack Numbers".....
http://www.billricca.com/small_arms_racks.htm
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