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AR-15/M16 LOWER SPRING KIT Reviews & Ratings

Parts kit contains 17 essential pins and springs for your AR lower receiver. Saves time when assembling components for a build and makes a great emergency replacement kit for small parts that are most often lost or broken.

Trigger Spring
Hammer Spring
2 Hammer Trigger Pins
2 Takedown Springs
Disconnector Spring
Safety Selector Detent
Safety Selector Spring
Bolt Catch Spring
Bolt Catch Plunger
Bolt Catch Coil Pin
Trigger Coil Pin
Buffer Retainer Spring
Buffer Retainer
Takedown Detent

SPECS: Kit contains: trigger spring, hammer spring, hammer & trigger pins (2), takedown detent springs (2), disconnector spring, safety selector detent, safety selector spring, bolt catch spring, bolt catch plunger, bolt catch pin, triggerguard pin, buffer retainer, buffer retainer spring, & takedown detents (2).

See all of our AR15s and AR15 parts here.

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Reviews Summary

The AR-15/M16 Lower Spring Kit offers a solid collection of components that generally fit well and serve as reliable spare parts. While the kit provides great value, some users noted missing springs like the magazine catch and a lack of documentation for assembly. Quality varies, and customer service is highlighted positively by those needing support.

What Reviewers Are Saying

Product Quality

70%

Many reviewers appreciated the overall quality of the parts in the kit, with most components described as fitting well and functioning correctly. However, a few issues were mentioned regarding specific parts not working, such as the oversized selector detent. Overall, product quality earned a favorable consensus.

Value for Money

60%

Reviewers frequently highlighted the affordable price of the spring kit, considering it good value for the assortment of parts provided. Users noted that having spare parts on hand is a practical investment, particularly for those involved in building AR platforms.

Missing Components

50%

Several reviews pointed out that the kit is not complete, lacking critical parts like the magazine catch spring. This omission caused frustration for some customers, making them feel misled if they expected a comprehensive kit. Clear labeling of included parts would enhance user experience significantly.

Instructions and Documentation

40%

A common concern among users was the lack of documentation included with the kit describing the parts or their installation. Reviewers expressed the need for a guide or paper that could help users understand the components and their applications better.

Customer Service

30%

Positive feedback highlighted the responsive and helpful customer service provided by CMMG, especially in resolving issues related to component quality. Customers appreciated the support provided when constituents did not meet expectations, making them more inclined to trust the brand.

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Know what you're buying

Just be aware this is not a complete kit to finish off your lower build. I didn't have the need to use all the parts in this kit. What I did use works fine and it went into a Poly FMK lower build I completed. No issues with parts being out of spec. The spring not included in this kit was the magazine release spring. I knew where the parts went but there is no documentation with this kit so you got to do some research if your not sure what goes where.