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Q&A for SIG SAUER MCX 5.56 Nato Upper Receiver — 3 Questions & 5 Answers

Name SIG SAUER MCX 5.56 Nato Upper Receiver (4)
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Q
Pete, guest, from AZ, United States, asked on November 09, 2021

does this come with trigger pack and BCG, ready to pop on my MCX rattler lower?

Expert Answer
A
Answered by Kurt Colbourne, Gear Expert, from IL, United States, on January 25, 2023

Unfortunately, this upper only comes with certain parts. The trigger group and adapters are not included as this is Sig Sauer's world sku. It will come with the upper with the typical parts, deflector assembly/handguard/gas block, as well as including the bolt carrier group.

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Expert Answer
A
Answered by Ethan, Gear Expert, from IL, United States, on February 09, 2023

This SIG SAUER MCX 5.56 Nato Upper Receiver is just the upper. It does not include the stock adapter or trigger.

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Q
Thomas Chin, member, from NY, United States, asked on July 18, 2021

What is the barrel length? Is this the new gen2 version?

A
Answered by DEF, member, from AL, United States, on December 21, 2021

Checked the Sig website and looked up MCX. Based on the Model # including 11B it is an 11.5 " barrel.

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Last updated 2025-11-12 UTC.