The MK2 is our second custom upper in a 16" variant. 16" ARs can do anything and they are legal in more places. 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, function, lock back on empty, and any buffer/spring recomendations I may have.
 
The Basics
 
16" 5.56 Ballistic Advantage Barrel, 15" Breek Arms Mlock Handguard,Toolcraft NIB BCG, Mil-Spec Upper, and Mil-Spec Charging handle
 
The Specifics
 
Barrel:
Manufacturer - Ballistic Advantage
Length/Chamber - 16" 5.56
Twist - 1:7 Twist
Material - 4150 Chrome Moly-Vanadium
Profile - Government
Gas System - Mid-Length
Finish - Nitride
Thread Pitch - 1/2x28
Gas Port - .076
*Dimpled*
*Pinned Gas Block*
1st Rebarrel - FREE
 
Ballistic Advantage makes good stuff and these are no different. The 16" Performance series is gassed perfectly with a .076" gas port on the midlength gas system. Recoil is negligible and ejection and extraction is strong and consistent. I recommend a standard carbine spring and buffer as these are gassed right in the sweet spot so nothing special is required, 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
 
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 - Toolcraft
Bolt Material - 9310 
Carrier Material - 8620 Alloy
Gas Key Material - 4130 Alloy
Profile - Full Auto
Finish - NIB
Gas Key Screws - Grade 8 (torqued and staked to Mil-Spec)
Forward Assist Cuts
Mil-Spec Firing Pin (Hard Chrome Coated)
 
Handguard:
Manufacturer - Breek Arms
Length - 15"
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 Tightented Down to 60 IN-lbs with Blue Loctite
 
 
Upper Receiver:
Manufacturer - Anderson
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 Aluminium
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
Pinned
 
Set screws are torqued to 30 IN-lbs and have High-Temp threadlocker applied for extra security.
 
 
Gas Tube:
Length - Carbine
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
 
The Build Process:
 
Every upper is assembled by me, one at a time. Every piece is hand fit, barrels to the uppers, gas blocks to the barrels, gas tubes to the blocks, handguards, roll pins. If something doesn't fit properly and securely, I don't put it together. What that means is that you get an upper where every component fits together like a glove for a rock solid build that won't fall apart or tear itself asunder during hard use.
 
On top of that we use the proper threadlocker on the appropriate parts. We use blue loctite on the handguard screws and then torque them to 35 IN-LBS. On the gas block screws we torque them to 25 IN-LBS then use a red high temp threadlocker (#272) to ensure the gas block never shifts. #272 threadlocker holds its strength up to 450 degrees VS. the 300 degrees of standard loctite.