The MK5 - 12.5" 5.56 Upper - The MK Series Finale

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MK5 Description:

The MK5 is our las 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 and steel cased ammunition, function, lock back on empty, and any buffer/spring recommendations I may have. Also includes the spent brass shells in the box.

The Basics
12.5" Ballistic Advantage 5.56 Upper, 7-sided Mlock Handguard from UTG Pro, AO Precision Phosphate/Chrome or Nitride BCG, and Mil-Spec Upper and Charging handle



The Specifics
Barrel:
Manufacturer - Ballistic Advantage
Length/Chamber - 12.5" 5.56
Twist - 1:7 Twist
Material - 4150 Chrome Moly-Vanadium
Profile - Government
Gas System - Carbine
Finish - Nitride
Thread Pitch - 1/2x28
Gas Port - .074
Dimpled
Pinned Gas Blocks

1st Rebarrel - FREE

All NFA/ATF Rules Apply

Ballistic Advantage makes good stuff, and these are no different. The 12.5" Performance series is gassed well for all ammo types with a .074" gas port on the Carbine gas system. Recoil is negligible and ejection and extraction is strong and consistent. I recommend a standard carbine spring and buffer for steel cased or an H1 or H2 for the hottest of ammo, though you can always tune to your desired feel. These are very accurate barrels, I expect around 2MOA accuracy with good ball ammo and 1 MOA or better with good match loads.

Barrel nut is sequentially 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:
Manufacturer - AO Precision
Bolt Material - C158 Tool Steel
Carrier Material - 8620 Alloy
Gas Key Material - 4130 Alloy
Profile - Full Auto
Finish - Phosphate with Chrome Lined Bore and Gas Key
Gas Key Screws - Grade 8 (torqued and staked to Mil-Spec)
Forward Assist Cuts
Mil-Spec Firing Pin (Hard Chrome Coated)

Nitride Also Available for a Discount

Bolt:
Machined from Carpenter Technology No. 158 alloy.
Heat treated
Shot peened per ASTM B851/SAE AMS2430S
Individually High Pressure Tested (test fired)
HP proof testing, 100% using a high pressure M197 or SAAMI commercial equivalent, without evidence of failure
Individually Magnetic Particle Inspected after Initial Test Fire
Manganese Phosphate Finish

Extractor:
4140 Steel per ASTM A108, cold drawn and stress relieved BHN 187-22
Manganese Phosphate Finish
Extractor Spring
Black Extractor Insert
Viton O-Ring

Carrier:
Machined from AISI 8620 aircraft quality alloy per ASTM A108/A322-13
Full Mass M16 Profile
Stress Relieved
Hard Chrome Bore


Gas Key:
Machined from 4130 chromoly steel alloy per ASTM A108/A322-13
Grade 8 Hardware
Properly Staked
Hard Chrome Internal
Permatex sealed


Handguard:
Manufacturer - UTG PRO Arwen (USA Made)
Length - 10"
Material - 6061 T6 Aluminum
Finish - Hard Coat Black Anodization
Mounting Platform - Mlock
Weight: 11.4 oz.
Pieces: 1
Rail Type: Picatinny/Weaver

Barrel nut torqued to 50 FT-lbs
Handguard screws torqued to 20 IN-lbs with Blue Loctite


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