17-5.56 KAK Complete AR15 Upper, 21" Barrel, 15" Mlok

Upper

• Barrel Length-21”
• Barrel Material- 416 R Stainless, Blasted Matte Grey
• Chamber 17-556 KAK
• Twist Rate 1:9
• Muzzle Device- KAK SAW Flash Hider 
• Extension- M4
• Gas System- Magnum Length
• Gas Block- Low profile .750 phosphate Finish
• Upper Receiver- Forged 7075 T6 Aluminum, Precision Machined to M16/M4 Spec
• Handguard- 15” Mlok, High Quality 6061 T6 Material Mlok with Proprietary Clamping System and Heavy-Duty Barrel Nut
•  Charging Handle- Milspec with Enhanced Large Billet Latch

BCG 

• M16 Auto Profile Carrier Machined from Aircraft/ Bearing Quality 8620 Steel, Properly Heat Treated, Ground to Perfection
• Bolt is machined from a single piece aircraft/bearing quality 9310 steel, heat treated properly, precision ground, Shot Peened and MPI’d
• Firing pin is machined to the mil-spec print from 8740, precision ground, and chrome plated
• One Piece Billet Fully Machined Enhanced Extractor, Phosphate coated for Increased reliability and corrosion resistance
• S7 tool steel ejector and extractor retaining pin
• 4130 Gas Key, precision staked using our hydraulic staking machine
• KAK Carrier Key Screws- T25 drive, Grade 8, Properly Heat Treated

All KAK complete upper receivers are test fired for feed and function using commercially loaded ammunition

NOTICE- 17-556 Was created by KAK Industry and is our proprietary chamber design. This chambering is NOT cross compatible with similar cartridges, do not attempt using other rounds in the 17-556 chamber.

We wanted to use brass that was plentiful and inexpensive, like lake city 5.56 military brass. We developed sub .5" loads or better with powder ranging from 4198- Ramshot Tac in correlation to the burn range data. Base loads can be worked up from 17-223 and 17 Remington load data for a base load. While using 20 gr bullets, and even faster with 15.5 gr. Velocities from 4200- Exceeding 4600+ FPS fps depending on charge and bullet weight is what we found to be optimal with this barrel.

We are producing KAK Industry 17-556 Custom chambered barrels for this cartridge currently.

Our Custom Chamber Reamers offer improvements such as reliable extraction, no neck turning needed, and the correct amount free bore in correlation to these light varmint bullets liking a jump to be accurate.

The barrels have optimized tweaks to aid in reliable extraction.

We worked with Redding to produce dies that match our chambers perfectly.

NOTICE- 17-556 Was created by KAK Industry and is our proprietary chamber design. This chambering is NOT cross compatible with similar cartridges, do not attempt using other rounds in the 17-556 chamber.

This chamber is NOT compatible with 17 Remington

DOWNLOAD 17-556 RELOADING DATA