Description
Primary Weapons Systems MK118 MOD 2 Upper Receiver Assembly – 6MM ARC
Elevate your AR-15 or AR-10 platform with the Primary Weapons Systems MK118 MOD 2 complete upper receiver chambered in 6MM ARC. This precision-engineered upper assembly combines advanced design with rugged durability to deliver exceptional accuracy and reliability for demanding shooters. Whether you’re engaging targets at extended ranges, competing in precision rifle matches, or hunting medium to large game, the MK118 MOD 2 provides the performance edge you need.
Why Choose the PWS MK118 MOD 2 Upper?
Built with the expertise of Primary Weapons Systems, a leader in firearm innovation, the MK118 MOD 2 upper is designed for shooters who demand the best. Its 6MM ARC chambering offers superior ballistics over traditional calibers, with flatter trajectories and reduced wind drift, making it ideal for long-range applications. The MOD 2 enhancements include improved gas system tuning and a reinforced handguard for added stability and comfort.

Key Features and Benefits
- 18-Inch Barrel: Crafted from high-grade stainless steel with a 1:7.5 twist rate, optimized for stabilizing 6MM ARC projectiles from 105 to 108 grains for consistent accuracy.
- Enhanced Gas System: Proprietary adjustable gas block ensures reliable cycling with a wide range of ammunition, reducing recoil and improving shooter control.
- MOD 2 Handguard: Free-float M-LOK compatible handguard provides ample rail space for accessories while minimizing weight and maximizing heat dissipation.
- Complete Assembly: Includes bolt carrier group and charging handle, ready to install on your lower receiver for quick setup and immediate use.
- Durability: Hard-coat anodized finish and robust construction withstand harsh conditions, ensuring long-term performance in the field or on the range.

Specifications at a Glance
| Model | MK118 MOD 2 |
| Caliber | 6MM ARC |
| Barrel Length | 18 inches |
| Twist Rate | 1:7.5 |
| Handguard | 15-inch M-LOK Free-Float |
| Finish | Hard-Coat Anodized Black |
| Included Components | Upper Receiver, Barrel, Gas System, Handguard, Bolt Carrier Group, Charging Handle |
| Weight | Approximately 4.5 lbs (without optic) |
Ideal Applications
This upper is perfect for:
- Precision Shooting: Achieve tight groups at 500+ yards with the 6MM ARC’s excellent ballistic coefficient.
- Hunting: Take down deer, hogs, and similar game ethically with controlled expansion bullets.
- Competition: Dominate in PRS or other rifle matches with its reliable performance and ergonomic design.
- Tactical Use: Dependable operation in varied environments for law enforcement or defense scenarios.

Why Buy from Americans Gun Shop?
At Americans Gun Shop, we are committed to providing top-quality firearms and accessories with exceptional customer service. Our team includes experienced shooters and industry experts who rigorously test products to ensure they meet high standards. We offer fast shipping, secure transactions, and dedicated support to help you make informed purchases. Trust us for authentic products, competitive pricing, and a seamless shopping experience tailored to shooting enthusiasts.
FAQ: Why Buy from Americans Gun Shop?
- Expertise: Our staff has hands-on experience with a wide range of firearms, offering reliable advice based on real-world use.
- Quality Assurance: We source directly from reputable manufacturers like Primary Weapons Systems to guarantee authenticity and performance.
- Customer Support: From selection to after-sale service, we’re here to assist with any questions or concerns.
- Secure Shopping: Your transactions are protected with advanced encryption, ensuring safe and confidential purchases.
- Fast Delivery: We process orders promptly and partner with trusted carriers for timely delivery to your doorstep.
Upgrade your rifle today with the PWS MK118 MOD 2 upper and experience the precision of 6MM ARC. Order now from Americans Gun Shop for a reliable addition to your arsenal.
| Model | MK118 MOD 2 |
| Caliber | 6MM ARC |
| Barrel Length | 18 inches |
| Twist Rate | 1:7.5 |
| Handguard | 15-inch M-LOK Free-Float |
| Finish | Hard-Coat Anodized Black |
| Included Components | Upper Receiver, Barrel, Gas System, Handguard, Bolt Carrier Group, Charging Handle |
| Weight | Approximately 4.5 lbs (without optic) |





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