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MK1 - 11.3" Hanson 5.56 Complete Upper Receiver

The MK1 is the first upper in a series of custom uppers. Focusing on bringing the highest value and performance possible in an affordable way.


The Basics


11.3" Ballistic Advantage Hanson 5.56 Upper, 9.8" KAK 7-Sided Mlock Rail, AO Precision TMS BCG, Mil-Spec Upper, & Mil-Spec Charging Handle


The Specifics



Manufacturer - Ballistic Advantage

Length/Chamber - 11.3" 5.56

Twist - 1:7 Twist

Material - 4150 Chrome Moly-Vanadium

Profile - Hanson

Gas System - Carbine

Finish - Nitride

Thread Pitch - 1/2x28

Gas Port - .072

*Pinned Gas Block*

1st Rebarrel - FREE


All NFA/ATF Rules Apply


Barrel nut is sequentialy torqued down to 50 FT-lbs. Starting at 25, then 35, and then finally 50 FT-lbs to ensure proper mating of the threads. 


If you legit burn out a barrel, like 10,000 -25,000 rounds, and the barrel becomes inaccurate I will rebarrel it for you for free. Good luck.


Bolt Carrier Group:

Brand: AO Precision True Mil Spec BCG

Bolt Material - C158 Alloy

Carrier Material - 8620 Alloy

Gas Key Material - 4130 Alloy

Profile - Full Auto

Finish - Phosphate/Chrome

Gas Key Screws - Grade 8 (torqued and staked to Mil-Spec)

Forward Assist Cuts

Mil-Spec Firing Pin (Hard Chrome Coated)


*Individualy MPI/HPT tested




Manufacturer - KAK

Length - 9.8"

Material - 6061 T6 Aluminium

Finish - Hard Coat Black Anodization

Mounting Platform - Mlock

Barrel Nut - Steel (does not require timing)

Wedge Lock Attachment


Barrel nut torqued to 50 FT-lbs

Wedge Lock is tightened to 60 IN-lbs


Upper Receiver:

Manufacturer - Anderson/Aero

Material - 7075 T6 Aluminum

Machined from Forged Aluminum

Finish - Type 3 Hardcoat Anodized Black

Standard Forward Assist

Standard Dust Cover

M4 Feed Ramps

NOT T-Marked, if you care...


Gas Block:

Material - 4140 Steel

Finish - Nitride

Style - Low Profile

Size - .750"

Attachment Method - 2x Set Screws

Not Adjustable



Set screws are torqued to 25 IN-lbs and have High-Temp threadlocker applied for extra security.



Gas Tube:

Length - Carbine

Material - Stainless Steel


Flash Hider:

Manufacturer - KAK

Type - A2

Material - 4140 HT Steel

Thread Pitch - 1/2x28

Caliber - .223/5.56


MK1 - 11.3" Hanson 5.56 Complete Upper Receiver

Lead Time is 2-3 Weeks
  • Our stated policy is to not accept returns, but if you accidently ordered the wrong item or there was a mistake or if you have any issue at all send us an email (listed in the "contact us" section) and we will work it out.

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