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Primary Weapon Systems

Primary Weapons Systems AR-15 MK1, MOD 2 Upper, 7.75" Barrel, 6.91" KeyMod Rail Complete 7.62x39 Upper

PWS AR-15 MK1, MOD 2 Upper, 7.75" Barrel, 6.91" KeyMod Rail Complete 7.62x39 Upper
Only 4 left

Availability: In stock




The PWS MK107 (Diablo) was developed specifically for CQB requirements and as a replacement option for MP5-style weapons. The short compact design retains lethal capability out to 200 meters and has been proven highly effective in the military and law enforcement community.



  • Weight – 3 lbs. 8 oz.
  • Overall Length – 17.25″
  • Barrel Length – 7.75″
  • Muzzle Device – CQB 30


Long-stroke piston:

The PWS long-stroke piston system combines the agility of the AR-15 with the reliability of the AK-47 into a sleek and efficient design.


Adjustable Gas Block:

Our three position adjustable gas block restricts gasses rather than venting them from the side. This allows the unused gas to exit from the front of the gun resulting in a quieter operation.

Position 1 is normal operation with standard and some military ammunition.

Position 2 is for suppressor use when running standard ammumition.

Position 3 is for suppressor use with hotter loads such as military ammumition.


Smooth Recoil Impulse

A detachable floating piston head is attached directly to the operating rod which is securely attached to the carrier.



Utilizing only the highest quality 416R stainless steel barrel blanks, MK1 barrels are turned in house then lithium embedded salt nitro-carburized treated (FNC LIFE HD) for hardness and corrosion resistance.

*7.62×39 features 1:10 barrel twist rate



PWS bolt carrier groups are machined from tool steel at strict tolerances, then FNC LIFE HD coated for durability and to reduce friction.

PWS engineers increased carrier mass to extend dwell time and delay unlock. As a result the PWS bolt carrier group allows chamber pressure to be greatly reduced for easier extraction.

Gaps and channels between skid pads allow for fewer points of contact. This results in less friction and keeps debris from interfering with function.

The PWS bolt system is optimized for each different caliber and features a spring assist for ease of assembly.



PWS engineers designed a handguard which is ergonomic as well as durable. Featuring KeyMod and PicMod®, the MK1 MOD 2 series handguard eliminates unnecessary weight and allows for a wide range of accessory placement.

Extruded and then machined from aircraft grade 6061 aluminum, every handguard comes standard with a full-length Picatinny top rail.

Integral sling swivel attachment points round out the back of the handguard.




Additional Info

Additional Info

Manufacturer Primary Weapon Systems
Finish No
Barrel Length No
Caliber No
Configuration No
Option No
Gas Length No
Height No
Rail Length No
Mount No
Profile No
Reticle No
Co Witness No
Size No



Feel free to ask us any question regarding this product.