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Q&A for Primary Weapons Systems MK116 PRO 16 inch Upper Receiver — 7 Questions & 8 Answers

Name Primary Weapons Systems MK116 PRO 16 inch Upper Receiver (4.5)
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Q
lizzardman, member, from NM, United States, asked on February 23, 2022

This upper is listed as having a .223 wilde chamber. Will this upper also handle 5.56 NATO rounds?

Expert Answer
A
Answered by Hunter, Gear Expert, from OH, United States, on March 09, 2022

Yes, you can shoot 5.56 out of these Primary Weapons Systems MK116 Pro 16in bbl Upper Receiver chambered for .223 Wylde.

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Q
JZ, member, from MA, United States, asked on February 03, 2023

Is the flash hider pinned and welded?

Manufacturer Answer
A
Answered by Primary Weapons Systems, Manufacturer from ID, United States, on October 18, 2023

The muzzle device on the Mk116 Pro upper is not pinned and welded

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Q
MP, member, from PA, United States, asked on January 03, 2022

What are the barrel specs? Chrome-lined, twist, profile? A lot of these PWS Barrels don’t come with any info. Thanks.

Expert Answer
A
Answered by Ethan, Gear Expert, from IL, United States, on March 01, 2022

Primary Weapons Systems only provided that it is a 1:8 twist barrel. I would recommend reaching out directly to the manufacturer for more information on the MK116 Pro 16in bbl Upper Receiver.

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Q
KRL, guest, from AZ, United States, asked on November 15, 2021

what is the finish on the barrell?

Expert Answer
A
Answered by Ethan, Gear Expert, from IL, United States, on March 11, 2022

Primary Weapons Systems does not list what the finish is on the MK116 PRO UPPER. I would recommend reaching out to them directly for more information. You can find their contact info below:
https://www.primaryweapons.com/contactus/

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Q
Anthony, guest, from WV, United States, asked on August 06, 2020

does this come with a bolt carrier group?

A
Answered by Karl, member, from NV, United States, on June 18, 2021

Yes. This has a custom bolt carrier with a long gas piston, similar to an AK-47.

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Q
Rell, guest, from MS, United States, asked on June 19, 2020

Is this the complete upper?

Expert Answer
A
Answered by Kurt Colbourne, Gear Expert, from IL, United States, on September 15, 2021

Yes, this is a complete upper with a custom BCG and a Radian Raptor charging handle.

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Q
Steve, guest, from UT, United States, asked on April 29, 2020

Is this complete with BCG and CH?

A
Answered by Karl, member, from NV, United States, on June 18, 2021

Yes. It comes with the custom bolt carrier group (with a long stroke gas piston) and a Charging Handle: Radian Raptor Ambidextrous Charging Handle

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Last updated 2025-11-12 UTC.