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Q&A for Primary Weapons Systems MK111 MOD1-M .223 Wylde, 11.85in bbl Upper Receiver — 9 Questions & 10 Answers

Name Primary Weapons Systems MK111 MOD1-M .223 Wylde, 11.85in bbl Upper Receiver (4.4)
$1,209.95 $1,129.95 Save $80.00
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Q
Morris, guest, from KY, United States, asked on February 17, 2020

Is this upper full auto rated.

Expert Answer
A
Answered by Ethan C., Gear Expert, from IL, United States, on March 25, 2020

The manufacturer has not provided that information, even on their own site. We recommend contacting them directly, they should be able to provide you with that information. You can reach them here: https://www.primaryweapons.com/contactus/

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Q
smokey, guest, from TX, United States, asked on December 14, 2020

Is this a piston or DI gas upper

A
Answered by panda, member, from OR, United States, on June 19, 2021

Operating System: PWS Long Stroke Piston System, 3 setting Adjustable Gas Regulator

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Q
Zzang, member, from MD, United States, asked on March 14, 2024

What is the barrel steel?

A
Answered by Rob, member, from NV, United States, on December 08, 2024

41V50
"41V50 is a high-quality, chromium-molybdenum-vanadium alloy steel known for its exceptional strength, toughness, and resistance to wear and heat."

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Q
Question, member, from AZ, United States, asked on June 21, 2022

Is his pinned and welded?

Manufacturer Answer
A
Answered by Primary Weapons Systems, Manufacturer from ID, United States, on July 06, 2022

No, our MK111 Mod 1-M does not come pin and welded

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Q
Ipdaily, member, from NV, United States, asked on June 18, 2022

Whats the thread pitch on the barrel

Expert Answer
A
Answered by Hunter, Gear Expert, from OH, United States, on July 01, 2022

The Primary Weapons Systems MK111 MOD1-M .223 Wylde Upper barrel is threaded for 1/2x28.

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Q
Stevie B, member, from IL, United States, asked on October 15, 2021

What BCG comes with this?

A
Answered by panda, member, from OR, United States, on February 25, 2022

Proprietary PWS piston driven BCG.

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Q
JT, member, from NV, United States, asked on October 21, 2020

Is this a complete upper? With Charger & BCG?

Expert Answer
A
Answered by Tom B, Gear Expert, from IL, United States, on August 26, 2021

Yes this is a complete upper with bcg and Radian Raptor™ Ambidextrous Charging Handle.

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Q
Miguel Cantu, member, from OK, United States, asked on February 15, 2025

Will this pair up well with a black rain ordinance billet lower?

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Q
Mike, member, from AR, United States, asked on February 12, 2025

Is the muzzle device pinned and welded?

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Last updated 2025-11-12 UTC.