About CUR-15-A (AR-15, .223 WYLDE, 5.56)
We worked closely with a premium rifle manufacturer to bring you these solid complete uppers at a great price. Every part of this upper is proudly made in America!
The upper receiver is forged 7075 aluminum, precision machined on 5 axis mills, then hard coat anodized; they are the finest you can buy. These forged uppers are excess M4A4 uppers from a military contract with M4 marks above the gas tube.
The barrel is 16" and chambered in 223 Wilde which can shoot both .223 and also handle the increased pressures of 5.56. The 1 in 8 barrel twist is the best option for general purpose and long range shooting with the most common rounds available (learn more about twist rate below). The barrel is manufactured from 4150 chrome molly vanadium and then salt bath nitrided for the best accuracy, corrosion resistance, and lifespan.
The M16 profile bolt carrier group is machined, heat treated, shot peened, and then ground to exacting tolerances of +/-0.0005” for smooth operation (you will see and notice the difference). The bolt is 9310 steel with a MIM extractor, shot peened, nitrided, and magnetic particle inspected. The firing pin is precision machined, heat treated, ground, then chrome plated per the mil-spec.
The 15" MLOK handguard has a lightweight and comfortable design with the interrupted rail and is machined from a 6061-T6 aluminum extrusion and then hard coat anodized. The design also features a reinforced anti walk lock-nut that prevents rail movement and also anti-rotation tabs that cradle the upper receiver.
The mil-spec charging handle is machined from 6061-T6 aluminum and then hard coat anodized. We also include our Finger Stop and our Large Barrel Thread Protector so you can leave it or easily unscrew it and replace it with a muzzle device of your choice.
These are complete uppers with BCG's and charging handles, and test fired to ensure you receive an excellent working upper. Again, these are not uppers assembled by someone in their garage or by some unknown company. These are fully machined and built in-house by a premium rifle manufacturer who is a major OEM builder for many top-tier brands. We worked with them to buy in bulk to offer our customers a truly great upper at an affordable price.
- 16" Government Profile, 1:8 Twist 223 Wylde Nitrided Barrel
- Mil-Spec M16 5.56 Bolt Carrier Group, Nitrided
- MPI'd, Shot Peened, Nitrided Bolt
- Includes our Finger Stop and Barrel Thread Protector
More information about twist rate:
Considering barrel length and bullet velocity, we feel this is the best option for general purpose and long range shooting with the most common rounds available. Many manufacturers choose a faster 1 in 7 twist which can cause accuracy issues with lighter 55-grain bullets by exaggerating tiny imperfections in the bullet when it spins too fast. The 1:8 twist rate is ideal for M855 62-grain “green tips”, but still stabilizes lighter 55-grain bullets well.
Inventory
Our website is a live inventory system. If you are able to choose options and add it to your cart, then we have it in stock and can ship from our warehouse. If you don't see the color you want, then it is out of stock (sorry no backorders; we don't like selling things we don't have). Please send us an email with your request and we will reply as quickly as we can concerning lead time.
Shipping Lead Time Transparency
We always strive to ship the next business day, BUT sometimes there are delays due to unforeseen circumstances. Please see the map below to determine the
approximate transit days for USPS from our location in Shingle Springs, CA (we do ship to other states too, but mostly within California). These are approximate transit days from USPS and are NOT guaranteed (USPS is good but not perfect). Please also note that USPS transit days are just the travel days and do not include our order processing time (in other words, the transit time DOES NOT start on the day you place your order). Thank you for your understanding while we do our best to get your order to you quickly.
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An Excellent Upper 
