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MK3s  Mlock - 13.9" Hanson 5.56 Complete Upper Receiver P&W

The MK3s is a MK3, but shorter. The 13.9" barrel  still has the ability to P&W to a legal 16" length while still being a very handy vesatile length. The Hanson barrel profile is factory pinned and very efficient for its weight. 


Each upper ships with a unique checklist noting the ejection pattern with brass cased ammunition, function, lock back on empty, and any buffer/spring recomendations I may have.


The Basics


13.9" Ballistic Advantage Hanson 5.56 Upper, KAK 4-Prong P&W to 16", 13" KAK Mlock Rail, H&M Nitride & Chrome BCG, Pinned Gas Block, Mil-Spec Upper and Charging handle


The Specifics



Manufacturer - Ballistic Advantage

Length/Chamber - 13.9" 5.56

Twist - 1:7 Twist

Material - 4150 Chrome Moly-Vanadium

Profile - Hanson

Gas System - Mid-Length

Finish - Nitride

Thread Pitch - 1/2x28

Gas Port - .080

*Gas Blocks Are Factory Pinned*

1st Rebarrel - FREE



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:

Bolt Material - 9310 Alloy

Carrier Material - 8620 Alloy

Gas Key Material - 4130 Alloy

Profile - Full Auto

Finish - Nitride/Chrome

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

Forward Assist Cuts

Mil-Spec Firing Pin (Hard Chrome Coated)



Manufacturer - KAK

Length - 13"

Material - 6061 T6 Aluminum

Finish - Hard Coat Black Anodization

Mounting Platform - Mlock


Barrel nut torqued to 50 FT-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


Charging Handle:

Material - 7075 T6

Machined from Forged Aluminum

Finish - Type 3 Hardcoat Anodized + Teflon Coated for Smoother Operation


Gas Block:

Material - 4140 Steel

Finish - Nitride

Style - Low Profile

Size - .750"

Attachment Method - 2x Set Screws


Not Adjustable


Set screws are torqued to 30 IN-lbs. and have High-Temp threadlocker applied for extra security.


Gas Tube:

Length - Mid Length

Material - Stainless Steel


Muzzle Device


KAK 3-Prong (P&W to 16.1" unless otherwise requested)

Finish - Phosphate

Thread - 1/2x28


When Pinned and Welded in place this will bring the MK3s to a legal 16"+ If you do not want it pinned please write that down in the order notes!


If you have any questions or requests please leave them in the order notes!


MK3s Mlock - 13.9" Hanson 5.56 Complete Upper Receiver P&W

SKU: MK3S-Mlock
Out of Stock
  • 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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