The MK5 is our last upper for the MK series of uppers, with more improvements to the overall build. These are Do-It-All uppers build to be extremely accurate, reliable, and affordable. First rebarrel is still free and every component has a lifetime warranty.
Each upper ships with a unique checklist noting the ejection pattern with brass ammunition, function, lock back on empty, and any buffer/spring recomendations I may have.
The Basics
12.3" Ballistic Advantage Hanson 5.56 Upper, 9.8" KAK 7-Sided Mlock RAill, AO Precision TMS BCG, Mil-Spec Upper and Charging handle
The Specifics
Barrel:
Manufacturer - Ballistic Advantage
Length/Chamber - 12.3" 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 Blocks*
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:
MFG: 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)
Handguard:
Manufacturer - KAK
Length - 9.8"
Material - 6061 T6 Aluminum
Finish - Hard Coat Black Anodization
Mounting Platform - Mlock
Wedge Lock Attachment
Barrel nut torqued to 50 FT-lbs
Wedge Lock Tightened down to 60 IN-lbs with Blue Loctite
MK5 - 12.3" 5.56 Complete Upper Receiver - Hanson Barrel
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.