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M16 20 INCH 5.56 COMPLETE UPPER RECEIVER GROUPS Reviews & Ratings

M16 Upper Receiver Groups now available from Colt! These 20” Upper Receiver Groups feature the same barrel used on M16A2 and M16A4 rifles, which has a Government profile and feature a chrome lined bore and chamber, along with a 1-7 twist. Colt has paired two of these models with Magpul MOE handguards to make them fully modular. Additonally these are available with or without a charging handle and bolt carrier group.

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Reviews Summary

Overall, customers express strong satisfaction with the M16 20 Inch 5.56 Complete Upper Receiver Group, praising its quality, fit, and fast shipping. However, a few reviewers note concerns over quality control regarding markings and scratches, and some have experienced gas system issues. Most feel it's a reliable and well-made product that lives up to its Colt reputation.

What Reviewers Are Saying

Product Quality

75%

Many reviewers highlight the exceptional quality of the Colt upper receiver, showcasing its solid construction, lightweight design, and precise markings that indicate thorough attention to detail. Overall, the craftsmanship meets or exceeds customer expectations.

Fit and Compatibility

60%

Customers frequently mention that the upper receiver fits well with various lower receivers, suggesting compatibility across different models. The tight fit and secure connections are reassuring and add to the product's reliability.

Shipping Experience

50%

Several reviewers report a positive shipping experience, with items arriving faster than expected. This aspect adds to the overall satisfaction, allowing customers to start building their rifles without long delays.

Quality Control Concerns

30%

A small percentage of customers voice concerns regarding quality control, particularly related to external markings and minor cosmetic scratches upon arrival. Some express disappointment over receiving parts that did not fully meet the expected Colt specifications.

Customer Satisfaction

80%

The overarching theme of satisfaction is prevalent, as many users express contentment with their purchase, indicating a strong faith in Colt's reputation for quality. This positive sentiment underscores the community's loyalty to the brand.

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gas system problem

Bought this and bcg last year went to use it this year and found problem with gas system needing gun smiting work.

by derrick k. on September 27, 2025

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Almost perfect

Biggest complaint I have with my copy the upper receiver does not have the Colt cage code or the typical square. This receiver just has the key hole mark. I'm no Colt/clone expert but it would appear that Colt is indeed farming out some parts. It does have a Colt barrel and marked accordingly. Fit and finish is outstanding. Hand guards fit seamlessly with no uneven gaps and they are tight. Hand guards are also reminiscent of the military issued rifles in that they are dense and not pliable like other cheap aftermarket offerings.