Description
Primary Weapons Systems MK114 MOD 1 Upper Receiver Assembly in 6MM ARC
Elevate your AR-15 platform with the Primary Weapons Systems MK114 MOD 1 upper receiver assembly chambered in 6MM ARC. Designed for hunters, precision shooters, and tactical enthusiasts, this upper combines advanced engineering with rugged durability to deliver exceptional accuracy and reliability. Whether you’re targeting game at extended ranges or engaging in competitive shooting, the MK114 MOD 1 offers a superior upgrade that enhances your firearm’s capabilities.
Why Choose the PWS MK114 MOD 1 Upper?
As experts in firearm components, we recommend the MK114 MOD 1 for its innovative long-stroke piston system, which reduces fouling and increases reliability compared to direct impingement systems. This upper is built to withstand harsh conditions, making it ideal for outdoor adventures and professional use. Its 6MM ARC caliber provides excellent ballistic performance, offering flatter trajectories and higher energy retention than traditional rounds like 5.56 NATO.

Key Features and Benefits
- Long-Stroke Piston System: Enhances reliability by reducing gas and carbon buildup in the receiver, leading to smoother operation and easier maintenance.
- 6MM ARC Caliber: Delivers superior long-range accuracy with less recoil, perfect for hunting medium-sized game or precision target shooting.
- Durable Construction: Made from high-quality materials, including a forged aluminum receiver and steel barrel, ensuring longevity and resistance to wear.
- Enhanced Ergonomics: Features an ambidextrous charging handle and M-LOK compatible handguard for customizable accessory mounting.
- Improved Accuracy: Includes a free-floated barrel and precision-machined components that minimize vibration and maximize shot consistency.

Technical Specifications
This upper receiver assembly is engineered to meet the demands of serious shooters. Below are the detailed specifications to help you understand its capabilities.
Applications and Use Cases
The MK114 MOD 1 is versatile enough for various shooting disciplines. Use it for:
- Hunting: Its 6MM ARC caliber is effective for deer, hogs, and other medium game at distances up to 500 yards.
- Tactical and Defense: The reliable piston system and durable build make it suitable for law enforcement and home defense scenarios.
- Competitive Shooting: Achieve consistent groupings in precision rifle matches or 3-gun competitions.
- Recreational Shooting: Enjoy a smooth, low-recoil experience at the range with enhanced accuracy.

Why Buy from Americans Gun Shop?
At Americans Gun Shop, we pride ourselves on providing top-quality firearm components and exceptional customer service. Here’s why you should choose us for your purchase:
- Expertise: Our team has years of experience in the firearms industry, offering knowledgeable advice and support.
- Authenticity: We source products directly from reputable manufacturers like Primary Weapons Systems, ensuring genuine items.
- Trustworthiness: With secure transactions and reliable shipping, your purchase is safe and guaranteed.
- Customer Focus: We provide detailed product information and are here to answer any questions you may have.
For more high-performance upper receivers, check out our selection of AR-15 uppers.
FAQ
Q: Is this upper compatible with any AR-15 lower receiver?
A: Yes, the MK114 MOD 1 is designed to fit standard AR-15 lower receivers, but always verify compatibility with your specific model.
Q: What is the barrel length?
A: The MK114 model typically features a 14.5-inch barrel, but refer to the specifications for exact details.
Q: Does it come with a bolt carrier group (BCG) or charging handle?
A: This upper assembly may or may not include a BCG and charging handle; check the product details or contact us for clarification.
Q: Can I use this for hunting in my state?
A: The 6MM ARC is legal for hunting in many states, but always check local regulations before use.
| Model | MK114 MOD 1 |
| Caliber | 6MM ARC |
| Action Type | Long-Stroke Piston |
| Barrel Material | Steel |
| Receiver Material | Forged Aluminum |
| Handguard Type | M-LOK Compatible |
| Charging Handle | Ambidextrous |
| Intended Use | Hunting, Tactical, Competition |





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