The Primary Weapons Systems MK114 Mod 2-M is a complete AR-15 upper chambered in .223 Wylde with a 14.5-inch barrel and FRC 556 handguard (Primary Weapons Systems part no. MK1-M2U-223-14-NC).

Key Specifications

• Chambered in .223 Wylde, suited to both .223 Remington and 5.56 NATO ammunition.
• Measures 14.5 inches in barrel length.
• Rifled with a 1-8 twist rate.
• Fitted with a FRC 556 free-float handguard.
• Sold under Primary Weapons Systems’ MK114 Mod 2-M upper line.
• Ships as a complete upper assembly, ready to mount to a compatible AR-15 lower.
• Includes the bolt carrier group and charging handle needed to fire once mounted, since it ships as a complete upper rather than a bare barrel.
• Classified as a firearm part/accessory, not a regulated firearm itself — an AR-15 upper by itself is not the ATF-serialized part, so no FFL transfer is required to purchase.

Frequently Asked Questions

Does a barrel under 16 inches make this a regulated short-barreled rifle? By itself this is a firearm part/accessory, not a complete firearm, and it ships without NFA paperwork. However, federal law treats a rifle with a barrel under 16 inches and a shoulder stock as a regulated short-barreled rifle (SBR) that requires ATF Form 1/Form 4 registration and a tax stamp before assembly. Building on a pistol-configured lower with an arm brace, or otherwise keeping the host firearm outside the rifle/SBR definition, are common ways builders stay compliant — confirm your specific configuration with the ATF or a knowledgeable gunsmith before assembling this barrel onto a host firearm.

Does this include a lower receiver? No, this is a complete upper only; you’ll need a compatible AR-15 lower to build a full rifle or pistol.

What handguard comes on this upper? It’s fitted with a PWS FRC 556 free-float handguard.

Buy the Primary Weapons Systems MK114 Mod 2-M Complete Upper, .223 Wylde, 14.5-Inch, w/ FRC 556

Order the Primary Weapons Systems MK114 Mod 2-M Complete Upper, .223 Wylde, 14.5-Inch, w/ FRC 556 today for fast, insured shipping from a Lubbock, TX gun shop. Browse more Primary Weapons Systems parts in our AR15 Uppers category.