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.