Primary Weapons Systems MK111 PRO Upper .223 Wylde 11.85 Barrel
All Primary Weapon Systems upper receivers
Click to see full view
Primary Weapon Systems
Overview
The Primary Weapons Systems MK111 Pro Upper is a complete upper receiver designed for the AR-15 platform, featuring an 11.85-inch barrel optimized for 5.56 NATO ammunition. The mid-length gas system ensures smoother cycling and reduced recoil, while the 1:8 twist rate provides versatility in stabilizing a wide range of bullet weights. This upper is often found in builds aimed at compact versatility, making it a solid choice for close-quarters engagements or as a lightweight option for a variety of shooting applications.
Specifications
Primary Weapons Systems MK111 PRO Upper .223 Wylde 11.85 Barrel
Available Merchants(3)
Prices checked
Stock Alert
Price and stock
The Primary Weapons Systems MK111 PRO Upper .223 Wylde 11.85 Barrel was out of stock everywhere we track for all of September 2026, and today none of the 3 retailers we track has it in stock right now. Listed prices start at $799.95 at BattleHawk Armory for when it comes back.
Prices checked · refreshed daily across 37 retailers
Not sure which upper receiver to pick?
We ranked every upper receiver by how often it shows up in real builds on GunPartPicker.
Read the guide: Most Popular AR-15 Upper Receivers →Check it against the live catalog:
Frequently Built With
Popular alongside upper receivers on GunPartPicker
Aero Precision M4E1 Complete Lower Receiver W/MOE SL Grip & SL-S Carbine Stock
Aero Precision AR-15 Breach Charging Handle Ambidextrous Small Levers
Geissele Automatics AR-15 SSA-E X Lightning Bow Trigger
Bravo Company M16 Bolt Carrier Group Black
Magpul AFG-2 Angled Fore Grip - Black
Magpul AR-15 MOE Stock Collapsible Mil-Spec Black
No reviews yet. Be the first to review this product!