This UPPER ASSEMBLY has the following standard features:
M4 Feed Ramp barrel extension
T-Marked forged upper receiver
1-9" twist, 6 grooves, right hand
5.56mm chamber (shoot either 5.56mm or .223)
11595E (SAE 4150) Barrel steel
Manganese Phosphate finish barrel
This 5.56mm caliber barrel is 16" long, threaded the standard 1/2 x 28 tpi, and has an A2 flash hider with the correct crush washer. The barrel is machined from chrome-moly, high vanadium steel and hardened to a U.S. government Mil-spec of Rc 26-32. The barrel, and all external steel parts, are manganese phosphate finished IAW 188.8.131.52 of Mil-STD-171, the U. S. government's recommended protective finish for steel. This finish not only looks great, it affords complete corrosion protection. These barrel is of M4 contour (tapered under the handguards, .750 under the front sight base) with M203 groove. This contour alleviates barrel whip and enhances accuracy in semi auto fire and helps dissipate heat. The barrel is button rifled with 6 grooves, right hand, 1 / 9" twist. The 1/9” twist is best because it handles the widest variety of ammunition and bullet weights.
The barrel is mounted on a FORGED A3 upper receiver with built in Mil-spec M1913 Picatinny accessory rail with the correct rail numbers engraved, made from certified 7075T6.511 forgings, hardcoat anodized IAW Mil Spec A8625, Type III, Class II, black per No. 37038, Table IX with nickel acetate seal, as per the Mil-spec. The upper features a forward assist and hinged ejection port cover.
This kit features a 16” long KEYMOD handguard. KEYMOD provides an extremely stable mounting platform for accessories, and is an extremely versitile handguard! Additionally this handguard free floats the barrel for increased accuracy. The handguard is machined from aircraft aluminum and hardcoat anodized IAW Mil Spec A8625, Type III, Class II, black per No. 37038, Table IX with nickel acetate seal, as per the Mil-spec. It has the proper "T" marks on the built in, full length M1913 Picatinny top rail, and will accomodate most piston kits. It is also one of the narrowest and lightest KEYMOD handguards on the market ( 1.35" ID). A standard carbine length AR gas system with gas block is located under this handguard. The upper is fully assembled. Drop in your bolt/carrier and charging handle, check headspace and let her rip!
If you would like to order a removable carry handle with match A2 sights installed, order one here: http://blackthorneproducts.com/cart/index.php?main_page=product_info&cPath=6_14&products_id=800
You'll need some KEYMOD rail sections:
PLEASE NOTE: For CHROMED barrel interior and chamber, You must ACTUALLY Order part # AR-CHROME on your web order form, if you do not see it and it does not charge you $50 on your form, you have not ordered it and will not receive a chromed barrel. Do NOT just put it in the special instructions. Here is the link: http://blackthorneproducts.com/cart/index.php?main_page=product_info&cPath=0&products_id=300
Add a BOLT CARRIER GROUP if you need one. (You must ACTUALLY Order part # AR-PA-8 for the BOLT CARRIER GROUP on your web order form and it must charge you for it, if you do not see it on your form, you have not ordered it and will not receive a BCG. Do NOT just put it in the special instructions). Here is the link: http://blackthorneproducts.com/cart/index.php?main_page=product_info&cPath=0&products_id=168
Be sure and order some KEYMOD rail sections: http://blackthorneproducts.com/cart/index.php?main_page=product_info&cPath=6_14&products_id=1096
Since this parts kit does not include the receiver, no FFL is required. Like all of our AR parts kits, this is MADE IN USA!
This product was added to our catalog on Friday 22 December, 2017.