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M16 5.56 BOLT CARRIER GROUP Reviews & Ratings

Complete, mil-spec assembly with bolt, bolt carrier, and firing pin ready to drop into the rifle or carbine upper of your choice. Each bolt assembly is high pressure tested and magnetic particle inspection tested to ensure it’s free from imperfections that can lead to premature failures. Properly staked gas key prevents gas leakage that can lead to short stroking. M16-style carrier on the black phosphate model has full-length shroud for tripping auto sear, so this carrier may be installed on full-auto law enforcement and military rifles. Carrier and gas key are chrome lined for smooth cycling and resistance to wear from hot combustion gases for years of dependable service.

SPECS: Steel, black parkerized finish. Fits mil-spec semi-auto and full-auto AR-15/M16 upper receiver chambered for .223/5.56mm.

See all of our AR15s and AR15 parts here.

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Reviews Summary

The Colt M16 5.56 Bolt Carrier Group impresses with solid craftsmanship and generally excellent functionality. However, several reviews noted quality control issues, including loose bolts and improper gas key installation. While some users remain loyal to Colt, others express disappointment over perceived declines in quality and inconsistent markings, leading to mixed purchasing experiences.

What Reviewers Are Saying

Product Quality

55%

The quality of the Colt M16 bolt carrier group garners mixed reviews. While many customers praise its craftsmanship and performance, others report quality control issues, such as loose bolts and poorly staked gas keys, raising concerns about reliability from such a premium brand.

Quality Control Issues

45%

Numerous reviewers emphasize problems with quality control, including inconsistent markings, scratches, and machining flaws. These issues often contradict the expectations set by Colt's reputation for quality, prompting disappointment and hesitation from loyal customers.

Value for Money

40%

While some users believe the product justifies its premium price due to expected quality, others feel that it underdelivers for the cost. The inconsistencies in manufacturing lead some to regret not opting for more cost-effective alternatives.

Customer Service

50%

Customer service receives high praise, particularly in handling returns and exchanges due to quality issues. Reviewers express appreciation for Brownells' responsiveness, contrasting their positive experience with the product issues.

Brand Loyalty vs. Expectations

38%

Long-time Colt customers show divided opinions as some remain loyal to the brand, while others express that Colt is no longer the gold standard it once was. This dissatisfaction arises from experiences that didn't meet previously high standards, prompting some to explore alternatives.

Shipping and Packaging

30%

Concerns related to shipping and packaging highlight issues like inadequate protective wrapping resulting in scratches or dings on the product, which is particularly disappointing given the price point. Customers expected better handling for premium items.

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Loose gas key

Gas key wasn't properly torqued. Staking looked good, but bolts were loose. Had to remove replace bolts and restake. Colt quality control should have cought this.

by Andrew on March 29, 2024

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Out of Spec

So out of spec it would not insert in any of the uppers I have. Would bind was as the gas key broke the plane into the upper. For the non believers the cam pin was aligned upright and none of my other BCGs had this issue. Sent back to Brownells and refunded.

Damaged in the wrapper

I have sourced these bolt carrier groups from other vendors with good results, but this latest one I ordered from Brownells was damaged while still in the factory wrapper. Upon inspecting my brand new bcg, I found a huge burr at the end of the gas key. The shipping envelope was not damaged, so I can only assume that Colts QC slipped up with this one. Sent this one back for a refund.