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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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Not the real Colt OEM BCG

This BCG is not made by Colt. The real oem BCG by Colt has a C stamp or 13629 cage stamp on it and the bolt assembly has MPC label on it. This particular BCG has no stamp or label at all. This BCG is definitely an after market product that Colt order From. I wouldnt pay $225 for this BCG since it not the oem product. But, this BCG feels and looks like it made with good quality material. Is hot about 200 rounds through it with no malfunction.

Was not impressed

I ordered this for le6921 colt upper,it came in a white plastic bag,said colt on it,not a colt bag,it was extremely sticky,and was sticking in my upper I had to pull out break down and completely clean off the glue.the bolt was not marked mpc or any markings whatsoever, I was not impressed, my Geissele BCG or Aero nitrate seemed to be much better quality, I called colt and they got very angry about me asking why the bolt was not marked mpc or white dotted for inspection, I was told they don't have to do that,brownells much more professional told me they just dont mark anything anymore but that its a genuine colt ,I have not made my mind up to send it back yet

I'm not convinced

Colt M16 bolts are the best out there. As I understand it, Colt was fearful they might mix in civilian variant bolts with military contract bolts (made differently) so they made them all to the exact same military specs and magnetic particle inspected each one. They were all marked "MPC" with a white inspectors dot on the bottom. Bullet proof. In all honesty here, semi auto AR15s are not going to take anything like the abuse of a full auto M4 and will typically take a lifetime of even "harsh" semi auto use. However, I like to know my bolts won't ever fail so I buy Colt. This last BCG I ordered had a bolt marked "A." Nothing else. Just an "A." I believed it to be a standard AR15 bolt and not the military M16 bolt they used to sell. If that's the case, I can buy a similar bolt or BCG from any major supplier for about half the cost. I sent it back to Brownells with no issues.

Good

Just b/c it is a Colt does not magically make it better than any other. Works fine, but does not excel in any area neither.