Primary Weapons MK114 Mod 1 Upper Receiver 223 Wylde 14.5"

Primary Weapons Systems MK114 Mod 1 Upper Receiver

The MK114 Mod 1 upper receiver from Primary Weapons Systems represents a refined approach to modern rifle engineering. Built on the proven 223 Wylde chamber, this upper delivers the versatility shooters demand—capable of handling both standard 5.56 NATO and 223 Remington ammunition with equal reliability.

Key Features

• Chamber: 223 Wylde for maximum ammunition compatibility
• Barrel Length: 14.5 inches—ideal for close-quarters work and tactical applications
• Barrel Finish: Hard-anodized for corrosion resistance and durability
• System: Direct-impingement design proven in demanding environments
• Compatibility: Designed for standard AR-15 lower receivers

Performance and Design

The 14.5-inch barrel strikes an excellent balance between velocity and maneuverability. This length is favored by professionals and serious shooters who need a compact platform without sacrificing ballistic performance. The 223 Wylde chamber is the gold standard for shooters who want to use both military-spec 5.56 NATO and commercial 223 Remington loads without compromise.

Primary Weapons Systems has built a reputation for attention to detail and quality manufacturing. This upper receiver reflects that commitment, offering the kind of reliability and accuracy that serious shooters expect from their equipment.

What You're Getting

This is a complete upper receiver assembly—ready to mate with your AR-15 lower receiver. Whether you're building a new rifle or upgrading an existing platform, the MK114 Mod 1 delivers performance and dependability.