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Description
This upper receiver build kit is comprised of the following items and comes with everything that you need to build out your upper.
Be sure to select any of or dust cover options from the dropdown menu!
Includes:
Complete 5.56 Polished Black Nitride Bolt Carrier Group
M4 Flat Top Upper Receiver - Stripped
Standard M4 5.56 Charging Handle - 7075 Aluminum
Component Features:
RTB 5.56 Black Nitride BCG
Enhanced 9310 Steel (Bolt)
8620 Tool Steel (Carrier)
Mil-Spec Extractor Spring, black extractor insert, Viton O-Ring
Tool Steel Extractor
Shrouded Firing Pin
Mil-Spec Gas Key (4130 Steel) attached with Grade 8 hardware and Properly staked
Caliber: .223 / 5.56 / 300 Blackout
Bolt is shot Peened and MPI
All BCG components are pre-polished before being processed and then post polished for an incredible shine
M4 Flat Top Anodized Upper Receiver - Stripped
Machined from a Mil-Spec 7075 T6 forging, hard-coat anodized per Mil-A-8625F, Type III - Black
M4 Feed ramps
Features a mil-std 1913 rail for mounting optics
Standard AR-15 Charging Handle
Standard Latch
Aluminum alloy
Hardcoat anodized - Black
SKU: SBNM16-SFTU-2-ACAR-UCH01
UPC: 696969697060
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Compare prices for SBNM16-SFTU-2-ACAR-UCH01 - RTB BCG Upper Build Kit, M16 Black Nitride BCG w/ Anodized Upper Receiver & Mil Spec Charging Handle from all vendors
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Comments (5)
As the ad says, they take another 15% off in the cart. With shipping, three at $116 each with the upper completion kit -- that's a steal
$131.80 before shipping if you include the basic dust cover and forward assist kit. Not bad.

Used RTB many of times. Great stuff. Never any issues. Killer deals.