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
F marked Front Sight Base
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 has a forged A2 front sight base with bayonet lug, not the cheaper cast front sight base which can break. It sports A2 rifle handguards with ALUMINUM heat shields, and a correctly sized gas port for reliable function. 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 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 better for bullet weights 62gr 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.
This upper includes a removable aluminum A2 carry handle with built in A2 sights with match adjustments. This handle can be removed to expose the M1913 Picatinny rail on the upper receiver for use as a flat top. This is the best of both worlds!
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 Sunday 08 May, 2016.