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Colt Complete Upper Receiver LE6920EPR-CK 5.56 NATO Enhanced Patrol Rifle 16"

$999.00

The Colt LE6920EPR is the gold standard for Ar15 rifles that all others are measured against. This complete upper receiver features a 13.25″ M-LOK rail, 16″ 1/7 twist rifling, chrome-lined barrel, and M4 feed ramps. It also comes with a complete Colt BCG and charging handle.

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Colt Law Enforcement LE6920EPR-CK Enhanced Patrol Rifle Complete Upper Receiver

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Colt Law Enforcement LE6920EPR-CK Complete 16 inch Rifle Vertical Example

Colt LE6920EPR-CK Enhanced Complete AR-15 Upper Receiver 5.56 NATO 16" Barrel Centurion Arms Free Float Rail M-LOK Rail

The Colt 6920 line of rifles basically wrote the book for what is true “Mil-Spec”. Colt has been in the firearms industry and supplying the military since 1836. When other AR-15 manufacturers come out with a new gun, the Colt 6920 is the standard they are judged against. 
 
This new LE6920 upper receiver has received a few upgrades over previous versions. LE6920 variants used plastic hand guards that limited mounting accessories. After the old plastic two-piece design, Colt introduced the “quad rail”.
 
Now with the latest “Enhanced Patrol Rifle” variants, Colt is using a free float M-LOK rail from Centurion. This is a much more user-friendly and high-performance rail than previous designs. 
 
The rail has four QD (quick detach) sling attachment points milled into the sides, as well as M-LOK slots for accessories. That isn’t even the best part! The Centurion rail is completely free-floating, which means the barrel isn’t touching the rail
That allows the barrel to vibrate more consistently when firing, which improves accuracy.
 
Along with the new free float handguard, Colt has changed out the standard front sight gas block with a new low-profile design. This allows the user to run any optic or iron sight combinations they would like. It also drastically improves the aesthetics and ergonomics of the rifle. 
 
The EPR at the end of the model number stands for “Enhanced Patrol Rifle”. The “LE” at the beginning of the model number stands for “Law Enforcement”.
 
Colt took decades of battle-proven rifle designs and modernized them for military and police units. Lucky for us, they also sell them to the general public!

Features

  • 16-Inch 1/7 twist Mil-Spec chrome lined high pressure tested and magnetic particle inspected chrome-moly steel barrel fully chrome lined with a mil-spec phosphate finish.  Lightweight barrel design with Government profile under the handguard, a 0.75″ gas journal, then a slightly thinner profile to the muzzle to maximize performance and minimize weight
  • Barrel is Colt marked stamped, just under the rail
  • Carbine length gas system
  • Colt factory low profile gas block
  • M-LOK 13.25″ Centurion ultralight, ultra-thin ML1513 rail, 6061 T6 aluminum with a Type III anodized hard coat black surface with four built-in QD swivel points and 1.4″ thin body (1.9″ up vertically), and a 1913 top rail, with T-engraved marks.
  • Colt M4 receiver: 7075 aluminum and Type III black hardcoat anodizing and white T-marks, and M4 feed ramps. 
  • Caliber – 5.56mm (compatible with .223 Remington)
  • Direct gas impingement system
  • Colt M4 Full auto capable bolt carrier group
  • Colt A2 “birdcage” mil-spec flash hider

Manufacturer’s Part Number:  LE6920EPR-CK

UPC: 098289035493

PACKAGE CONTENTS

  • Colt LE6920-EPR factory upper receiver group
  • Complete Colt M4 Full Auto Bolt Carrier Assembly
  • Colt Mil-Spec Charging Handle
  • no iron sights included

Upper Receiver Specifications

UPC: 098289035493 Manufacturer: Colt's Manufacturing Company, LLC
Manufacturer Part Number: LE6920EPR-CK Type: Complete Upper Receiver
Barrel Length: 16" Receiver Material: 7075 Aluminum
Gas System: Carbine length direct impingement Caliber: 5.56 NATO / .223 Remington
Color: Black Finish: Type III hardcoat anodized
Rail: 13.25" Centurion M-Lok Package Includes: Upper Receiver, BCG, Charging Handle

Frequently Asked Questions

Yes! This is an upper receiver only and there are no regulated parts that would need to go through an FFL. You’re good to go!

We typically get products packed and shipped on the same day if you order before 3 EST. If not the same day, it will go out the next business day. We use FedEx for all of our hard goods, and a signature will be required for this.

We require adult signatures for orders over $500. This upper isn’t cheap, and I’m sure you don’t plan on donating it to your local porch pirate.

Yes! This is a 16″ barrel upper receiver, which is legal in all 50 states. (we are NOT lawyers, so do your own research if you aren’t sure.) The ATF may change their mind tomorrow and not bother telling anyone about it, but for now, you’re good to go. 

No, we strictly ship within the United States only.

Yep! We also don’t charge any kind of restocking fees or other nonsense. If you have an issue, we will do our best to get you squared away. Don’t take advantage of us, and we won’t take advantage of you. :)

No, this is an AR15 upper receiver only. There are no regulated parts that would require an FFL transfer. This can ship straight to your front door.

No, this is an AR15 upper receiver only. No sights or any other greyed-out parts are included. 

Yes, this LE6920EPR upper receiver ships with a Colt M4 full auto-capable bolt carrier group and Colt Mil-Spec charging handle. Drop it on a lower receiver, throw an optic on, and you’re good to go. 

ABSOLUTELY NOT. This is an upper receiver only. Both the BCG and barrel are designed to be fully functional with full auto and burst fire lower receivers, but the upper does NOT have any full auto capabilities out of the box.

As long as your lower is within normal AR15 specifications, this Colt upper should work just fine. Honestly, if it doesn’t work with your lower, you might want to get a new lower…

Direct impingement means that the gases generated from firing a bullet are redirected through a gas tube. The gas tube feeds back into the upper receiver at the top of the bolt carrier group. When the gas pushes against the bolt carrier group, it causes it to eject the spent casing in the chamber and then feed the next round from the magazine. 

Other terms for this are “gas gun”, “DI”, and “canon”. 

If you genuinely didn’t know that, I would highly recommend checking out this “How an AR-15 Works” video animation. It’s AWESOME.

Also, if you’re brand new to the AR-15 world, I would recommend checking out Palmetto State Armory. You can get a complete rifle for less than the price of this upper receiver. That’s not to say this is a ripoff, it’s just more of a high-end upper, whereas PSA is more entry-level.

Magnetic particle inspection is a non-destructive test (NDT) that is done to find microscopic cracks and imperfections in the metal. The process involves electro magnates and tiny magnetic particles suspended in an ultra violate light-sensitive liquid. It can also be done with magnetic powder with similar results. 

Colt fires a high-pressure M197 Proof Load cartridge with each bolt and barrel and then does an MPI test to look for any cracks or other microscopic issues with the metal in the barrel and bolt. The image below shows what cracks look like during the test. It is a screenshot from this video by MaterialsScience2000.

Chrome-lined barrels are a requirement from the military to meet the Mil-Spec standards. The lining is designed to help prevent corrosion and premature barrel wear from excessive heat from full auto fire. 

No. Since this upper receiver is NOT a firearm in its current state, you do not need any kind of permit to own it. Again, we aren’t lawyers and we strongly encourage you to do your own research into whatever state you live in if you aren’t 100% sure. This should not be considered legal advice.

The forward assist is the small button sticking out the back right side of the upper receiver. It is designed to help push the bolt carrier group into battery if the receiver is full of dirt or other junk. Basically, it helps keep the rifle in the fight if you’re in some seriously bad conditions. 

If you genuinely didn’t know that, I would highly recommend checking out this “How an AR-15 Works” video animation. It’s AWESOME.

 

Colt rifles are made in the United States. Specifically, they are made by Colt’s Manufacturing Company LLC, at 545 New Park Ave, West Hartford, CT 06110.

7075 aluminum uses Zinc and magnesium in the alloy. The more common and much cheaper 6061 aluminum uses copper and silicon in it’s alloy. 

In simple terms, 7075 aluminum can withstand 58.4% more pressure than 6061 aluminum. It’s also more expensive to produce and machine, which is why a lot of companies use 6061 instead of the more expensive 7075. This article from Kloeckner Metals goes into great detail on the exact differences.

M4 feed ramps are basically extended ramps from the barrel extension that cut into the lower receiver. When Colt came out with the M4 carbine, the shorter barrel and gas system was causing some feeding issues where the bolt was moving faster than the magazines could keep up. 

The M4 ramps basically create a longer, smoother ramp for the cartridges to slide into the chamber. 

Hardcoat anodizing is a process of using sulfuric acid and electricity to create a hard oxide film over the part. Here is an in-depth article on hardcoat anodizing if you want to dig deeper. 

M-Lok refers to the type of attachment system used for accessories on the rail. Magpul invented and patented the Modular Lock (M-Lok) system.

Free float is referring to the way the rail attaches and interacts with the upper receiver and barrel. When you fire a bullet through a barrel, the barrel vibrates and moves in very specific ways. If the handguard or rail is physically touching the barrel, any interaction you have with that handguard will negatively affect the rifle’s accuracy. With a free float rail, the barrel is completely free to vibrate and move consistently, which drastically improves repeatable accuracy. 

No, they are not the same. The 5.56 NATO round has higher pressure thresholds and different case size. It is safe to shoot both 5.56 and .223 Remington in a rifle that is chambered in 5.56. DO NOT SHOOT 5.56 NATO in a rifle chambered in .223 Remington. The higher pressure round can cause catastrophic damage.

Here’s a video produced by Federal Ammunition explaining more:

No. Colt produces the LE6920EPR rifle and upper primarily for the Military and police, but it is also available for the general public. There are no special licenses or law enforcement requirements to buy or own a LE6920EPR upper receiver like this.

Colt Complete Upper Receiver LE6920EPR-CK 5.56 NATO Enhanced Patrol Rifle 16"

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