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The Colt AR-15 Resource

"A site dedicated to the history of the Colt AR-15 rifles, carbines and associated items"

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Home
About
Colt.com Product Tracker
- 2019
- 2020
Rifles (5.56×45 / .223)
Rifle (7.62×39)
- CK-901 (Yemen)
Carbine (9×19)
- R6430 9mm Sporter Lightweight
Carbine (7.62×51)
- CM762 Modular Carbine
- LE901 / CM901 Modular Carbine
Carbines (5.56×45 / .223)
AR-15 Military Classics Series
Colt ‘CR’ Firearm Series
Mexico Government Return Rifles
- LE6920M Standard w/Carry Handle
Colt M203 Grenade Launcher
Z-COTE Limited Edition
Expanse M4 Series
Colt Walther .22LR Tactical Rimfire Series
Prototype/Testing Designs
Optics and Optic Mounts
Factory Conversion Kits
Factory Accessories, Parts and Individual Lower Receivers
Colt AR-15/M-16 Bayonets
- Eickhorn W. Germany Manufactured
Part Variations
Magazines
Manuals
- AR-15 Comanche Operation and Maintenance Manual
- 2010 SCW0921 Sub-Compact Weapon
Colt Licensed Accessories (Firearm cases, cleaning kits, range bags, etc.)
- Rifle Case (Bob Allen) 1984
- Colt Grip Laser (CGL)
Books/Magazine Articles
Advertising/Promotional Material
Catalogs
Colt Roll Die’s
Report Of The M16 Rifle Review Panel 1 JUN 1968
Colt AR Related Videos
Colt Ammunition
- Colt Hunting & Defense by Black Hills
Colt SCAR-B Clone Project
Colt Competition
- Colt Competition 9mm Carbine

December 21, 2021

Colt 6940-series Monolithic/Modular Upper Receiver Reinforcement Plate Explanation

A common question that I have been getting is… What is the small screw for that is seen on some of the Colt monolithic/modular upper receivers?

In the video below, I explain to you what the screw is for.

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Side-By-Side Look At Colt LE901 .308 & 5.56mm Bolt Carrier Groups

Side-By-Side Look At Colt LE901 .308 & 5.56mm Bolt Carrier Groups

Site Update 23 DEC 2021

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Back: Colt AR15A4 20″ Rifle Front: AR6720 AR15A4 Lightweight LE Carbine

From Top to Bottom: LE6940, AR15A4, LE901-16S, LE6920, LE6920

Colt re-issue M16A1 and XM177E2

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