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The MK111 MOD 1-M Upper is equipped with the renowned PWS PWS long-stroke piston system, maintaining the reliability that PWS owners have come to trust. This li…
$1,209.95
SKU: M111UA01-1F
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The MK111 MOD 1-M Upper is equipped with the renowned PWS PWS long-stroke piston system, maintaining the reliability that PWS owners have come to trust. This line features a free-float MLOK handguard, forward assist controls, and a design closer to mil-spec standards, catering to civilians and Law Enforcement alike. With fully forged upper and lower receivers, the MK1 MOD 1-M offers a straightforward solution for those seeking a high-value option that delivers unwavering performance in any situation.

What PWS aficionados refer to as the “ideal rifle”, the MK111 MOD 1-M is perfect for shooters looking for a weapon with endless uses. Maintaining the shortest barrel length recommended for suppressed use, this compact rifle is one of the most popular from LE to heli-hunting. 

 

 

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  • Sub-MOA Accuracy Guarantee: Experience Sub-MOA accuracy with high-grade ammo, thanks to our Boise made precision barrels.

  • PWS Long Stroke Piston System: Renowned for reliability and reduced fouling, with adjustable gas settings for optimal performance.

  • Forward Assist Integration: Essential for reliable chambering of rounds, particularly in adverse conditions, ensuring seamless operation and increased reliability for shooters.

  • Suppressor Optimized: Provides enhanced suppressor performance by minimizing back pressure, reducing gas blowback, and optimizing gas flow for a cleaner and more comfortable shooting experience.

  • .223 Wylde Chambering: Meticulously designed for outstanding accuracy and reliability, accommodating both .223 Remington and 5.56mm NATO.

  • Lightweight Design: The MK111 upper weighs just 4 lbs, ensuring superior maneuverability without compromising performance.

  • Barrel: 11.85" .223 Wylde barrel with a 1:8 twist rate, delivering exceptional accuracy and versatility when firing both .223 Remington and 5.56mm NATO rounds.

  • Fully Forged Receiver: Forged 7075-T651 Aluminum upper and lower receivers for durability and strength designed to mil-spec standards, ensuring compatibility and familiarity for users.

  • Free-float MLOK handguard:  Offering improved handling and accessory mounting options.

  • PWS FRC 2-Port Compensator: A suppressor compatible compensator that expertly mitigates recoil, muzzle rise and is compatible with the Rearden Atlas suppressor mounting system.

  • Radian Raptor™ Ambidextrous Charging Handle: Ensures smooth operation for both left and right-handed shooters.

  • The PWS VOW: Our warranty for all PWS products, guaranteeing repair or replacement for any defects or issues, ensuring your complete satisfaction.

 

 

THE PWS VOW: YOUR ASSURANCE, OUR WARRANTY Our VOW embodies our commitment to you, our esteemed customer. VOW stands for a Valued Owner Warranty, and it's about your satisfaction above all else. We pledge to repair or replace any PWS product that experiences damage or defects, regardless of the circumstances or place of purchase. Your peace of mind is our priority.
LIMITED LIFETIME WARRANTY Your PWS product is safeguarded for life against manufacturing and design defects, fully transferable with no need for proof of purchase.
COMPREHENSIVE COVERAGE From firearms to accessories, our warranty ensures all PWS product remain in prime condition.
EFFORTLESS RESOLUTION Should an issue arise, our dedicated warranty team is here swiftly address it, providing seamless repairs or replacements.
PRECISION ACCURACY GUARANTEE Every PWS firearm comes with a sub-MOA guarantee when using high quality ammunition in conjunction with sound shooting fundamentals and a stable firing position.

MK111 MOD 1-M Upper .223 Wylde

$1,209.95

Customer reviews

2 Reviews Write a Reviews
  • First Upper on First Build
    5

    Posted by KNC EMP on Nov 16th 2025

    This upper has been great so far, I've had it a couple months and put a few hundred down range in a few trips. I built my AP lower and went with an Armaspec H2 SRS buffer. I asked PWS CS ahead of time to confirm compatibility, but the weight on this is double a typical H2. It didn't lock back on first mag of .223 PMC Bronze, but I've since added a Wolfpack Armory Exhaust Tip and had no issues (even without Exhaust Tip this will lock back on PMC 55gr .223 now). With that said this gun hasn't had any problem with any other ammo I've fed it: 5.56 PMC Bronze 55gr, .223 Gold Dot Speer 62gr, 5.56 Hornady Black Interlock 75gr, .223 Hornady Cirtical Defense 73gr, and M855. This could have been due to break in period. However, this gun shoots super flat and the buffer is heavy. I don't yet have a suppressor to test the adjustable gas block, but the craftsmanship of the upper is superb. I don't have experience with a DI AR, but getting the bolt and piston back in the upper is difficult to line up and get back into the gun after maintenance. Overall I'm very pleased I choose PWS for my first rifle. I've shot family members rifles and own and train with pistols, but I'm impressed with how small my groups were first time seriously training on a long gun with both my EOTech and BUIS. Short female shooter at 5'4", but love the length of this gun and it's weight isn't bad for all the warnings about piston guns.

  • Worth the money you definitely get what you paid for!
    5

    Posted by Chris on Aug 3rd 2020

    Outstanding upper receiver, matched up perfectly with my Sig P516 lower. Accuracy is awesome, grouped well with 68 grain Hornady from Frontier at 100 yards.

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SUBMOA GUARANTEE

On all PWS uppers and complete rifles when using high quality ammunition.

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