This UPPER ASSEMBLY has the following standard features:
M4 Feed Ramp barrel extension
T-Marked forged upper receiver
1-7" 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 20" 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 184.108.40.206 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 barrels are of A2 or "Government" contour (tapered under the handguards, .750 under the front sight base) which 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 / 7" twist. The 1/7” twist is best for bullets 62 gr. and heavier.
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.
The barrel has a machined 4 position, hardcoat anodized, aluminum gas block for easy mounting of accessories. This configuration is excellent for use with optics because the low profile of the gas block does not interfere with your sight picture through the optics. It sports a hardcoat anodized, machined aluminum handguard that completely free floats the barrel for increased accuracy. The handguard is knurled for sure grip.
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
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
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 Thursday 28 April, 2016.