First, let’s get the specifications out of the way. For all intents and purposes, the upper I was sent is as close to a “standard” 16″ upper as you can find.

There are no weird features or proprietary technologies that are going to drive up the price of this upper. The price online for this specific upper is $369.99 as configured below:


  • SKU 617-UA556CM41618P-15M3
  • Weight: 5.3 lbs
  • Length: 16″
  • Barrel Profile: M4 Contour
  • Twist: 1:8
  • Finish: Parkerized
  • Material: 4150 Chrom Moly Vanadium
  • Thread Pitch: 12/28
  • Caliber: 5.56 NATO
  • Feed Ramp: M4
  • Flutes: N/A
  • Gas System: Carbine
  • Gas Block: 0.750
  • Gas Hole: 0.070
  • Charing Style: Rear Charging
  • Color: Black
  • Dimpled: Yes



Most of you who are looking for a completed upper aren’t looking to fiddle with the product much. If you’re like me, you expect to order the upper, open up the box, maybe put a little bit of gun oil on it and then slap that thing right on the nearest available lower receiver.

This means you don’t want to be messing around with detents, or Torx screws, or gas systems to make sure everything is good to go before you take it to the range.

As soon as the upper arrived I gave it a good once over to check for any obvious defects – there were none. Everything seemed tightened down correctly and the gas block looked like it was put in the proper place and screwed down nice and tight.

Finally, the flash hider was timed correctly with the crush washer installed in the correct direction.


To make sure the handguard stayed in place throughout testing, I went ahead and placed some witness marks along the handguard and the Torx screws to make sure nothing would rattle loose throughout firing, handling, and some light physical abuse.

The only minor issue I had was perhaps some minor fitment issues with one of the lower receivers I tried to pair it with.

This could be more of an issue with tolerance stacking but I had very strongly wanted to place this Bear Creek Arsenal upper on my newly acquired KP-15 Lower.

In the end, I was able to get the two receivers together but it did take a bit of finagling to get them to mate up and the fitment is very tight.

This could be a plus or a minus in your book but I thought it was worth mentioning as some of the other lower receivers I tried to pair it with (Aero, Cobalt Kinetics, PSA, etc.) fit with no problem.

Either way, the dimensions of the upper receiver takedown holes seemed to be within spec so you shouldn’t have any fitment issues regardless of your lower-receiver selection.



I’ll put this out there once again and say that I am by no means a precision rifle shooter nor am I the best shot even within my own zip code. I took the upper receiver to the range in tandem with the KP-15 lower to test that out a bit and also topped the rifle off with a nice SIG Sauer TANGO6T 1-6x24mm LPVO.

I did a quick boresight of the rifle in at 50 yards and then gradually stepped it out to 200 yards. Since I wanted to get just a general accuracy-test done, I shot only at steel targets at the range I had access to.

I was able to reliably make hits at 50, 100, 150, and 200 yards on a 12×12 inch square steel plate using that particular setup. I’d say that’s some reasonable accuracy for an out-of-the-box AR.


Showing 1–12 of 34 results

16″ 350 Legend Parkerized Complete Upper

AR 15 UPPERS FOR SALE AR 15 UPPERS FOR SALE. Barrel: 16″ Parkerized Caliber: 350 Legend 12″ KeyMod Super Slim

20” 350 LEGEND Stainless Barrel 16.5” Rail – A2 Flash Hider AR15 Rifle Upper Assembly

20″ 350 LEGEND 416R Stainless Heavy Contour Barrel with 1×16 Twist and 5/8×24 Threads. Mil-Spec Upper Receiver forged from 7075

7.62×39 barrel

FEATURES –Caliber: 7.62×39 -Barrel: 16″ -Twist: 1:8″ -Weight: 1.48 lbs

Adams Arms P1 Upper 5.56 NATO / .223 Rem 16″ Barrel

The Adams Arms P1 is a lightweight and highly durable complete upper assembly for an AR-style rifle build. It comes chambered in 5.56 NATO with a 16 inch barrel. Features include an optics ready flat-top, a heatshield handguard, and a forward assist. Get this upper today for the best price online from us!

Aero Precision AR15 XL Assembled Upper Receiver

Finish the top rated gun that is the AR15 with the Aero Precision XL Assembled Upper Reciever available from us. Laser engraved T-markings, includes port door and forward assist, compatible with AR15, and the port door allows ejection of multiple kinds of rifle casings. Whether you use the AR15 for a competition gun or home defense gun, this AR15 upper will make improve yours or make your rifle a solid gun to have. Purchase your upper from us today the next time you look to buy guns online!

Aero Precision M4E1 Enhanced Upper Receiver Black 5.56 / .223 Rem

The M4E1 upper receiver is a one-piece design combining the handguard mounting platform with the upper itself. Through superior engineering,

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The M5 .308 Stripped Upper Receiver is the perfect upper for your big bore rifle build. Forged from 7075- T6

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Aero Precision M5E1 Enhanced Complete Upper Receiver 15″ M-Lok Black 6.5 Creedmoor 20-inch

The Aero Precision M5E1 Enhanced Complete Upper features a 15" free floated M-Lok handguard and 20" 416 stainless steel barrel and is chambered in 6.5mm Creedmoor. This complete upper already has the forward assist and port door already installed but does not include a charging handle or bolt carrier group.

Aero Precision M5E1 Enhanced Upper Black 6.5 Creedmoor 20-inch

The Aero Precision M5E1 Enhanced Upper Receiver features a 15" free floated aluminum keymod handguard and 20" 416 stainless barrel chambered in 6.5 Creedmoor with a 1 in 8" rate of twist. The forged upper receiver and handguard are finished in black hard coat anodizing and the stainless barrel features a bead blasted surface. This upper does not include a charging handle or bolt carrier group.

Aero Precision M5E1 Enhanced Upper Receiver .308 Win 18″

 the name you know and trust when it comes to purchasing high quality accessories for your firearms. This particular upgrade such as this Aero Precision M5E1 Enhanced Upper Receiver that will allow you upgrade your rifle the way you need it in either in the field, range, or combat.