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MK2 - 16" Rifle Length Modern Dissipator - 5.56 Complete Upper

The MK2 is our second custom upper in a 16" variant. Now with a KAK 16" Rifle length gas system and Breek adjustable gas block meaning you can tune it to be one of the softest shooting uppers on the market weather suppressed or unsuppressed. 


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


The Basics


16" KAK Rifle Length Barrel, Breek Arms Adjustable Gas Block, 15" KAK Mlock Handguard, AO Precision TMS BCG, Mil-Spec Upper, and Mil-Spec Charging handle


The Specifics



Manufacturer - KAK

Length/Chamber - 16" 5.56

Twist - 1:7 Twist

Material - 4150 Chrome Moly-Vanadium

Gas System - Rifle Length

Finish - Nitride

Thread Pitch - 1/2x28


1st Rebarrel - FREE


Barrel nut is sequentially torqued down to 50 FT-lbs


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:

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)


*Individually HPT/MPI Tested



Manufacturer -KAK

Length - 15"

Material - 6061 T6 Aluminum

Finish - Hard Coat Black Anodization

Mounting Platform - Mlock

Barrel Nut - Steel (does not require timing)


Barrel nut torqued to 50 FT-lbs



Upper Receiver:

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...


Charging Handle:

Material - 7075 T6

Machined from Forged Aluminum

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


Gas Block:

Breek Arms Adjustable Gas Block

Material - 4140 Steel

Finish - Nitride

Style - Low Profile

Size - .750"

Attachment Method - 2x Set Screws

Dimpled + Rockset


Gas Tube:

Length - Rifle

Material - Stainless Steel


A2 Flash Hider:

Manufacturer - KAK Industries

True Mil-Spec A2 Flash Hider

Material - Steel

Thread Pitch - 1/2x28

Caliber - .223/5.56

Comes Timed With a Crush Washer

MK2 - 16" Rifle Length Modern Dissipator - 5.56 Complete Upper

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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