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AR-15/M16 LOWER SPRING KIT

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.
5
Good to have in my “if needed” AR stuff…
You know how easy them there little springs can escape into the great unknown never to be seen again on this side of life, so I try to keep several unopened packets of their springy a$$ed little kinfolk around just in case one runs away never to be seen again…I needed an unopened new pack to add to my emergency parts stash and this one fit my needs and wants. Brownell’s carries good stuff so I ordered one of the spring packs and it fits my needs to a tee at a fair price.
Would you recommend this? Yes, I would recommend to a friend
5
Good PK
Great parts kit. I needed a few extra parts to keep in my box for builds and repairs. I would highly recommend grabbing this kit to keep on hand.
Would you recommend this? Yes, I would recommend to a friend
5
Just what I needed
I am always working on builds, upgrades, and maintenance on my builds, I needed this parts kit in a pinch. After installation and testing, zero issues.
Would you recommend this? Yes, I would recommend to a friend
5
Good kit
It's a parts kit. Shipped quick as always and arrived in 1 pc.
Would you recommend this? Yes, I would recommend to a friend
5
Great kit
Seems kind of hard to mess up a lower spring kit. This kit has all the appropriate parts, and it installs like its designed to do.
5
The only backup sights I use
The all metal MBUS backup sights sre the only backup sights I I find acceptable. They are expensive because good quality means you have to pay. Buy once and only cry once!
5
Good value
Great value. USA made. The only con is the apparent common problem of the detent spring being too long when changing stocks. It requires modification by shortening to ease installation.
5
Bought CMMG lower parts for AR builds.
I am using this kit for spare parts only. I have bought a couple CMMG lower parts kits, and they have worked fine.
5
Just the parts you need
Since I've pieced together my new lower with various parts, I didn't need a full LPK. This had everything to fill the gaps. Everything fit well and worked nicely. If you read the contents of this kit, you won't be disappointed, and yes, there is no mag catch spring.
5
Better than the average parts kits
Now that Bushmaster and DPMS are sharing parts and tooling and some of their parts like their AR-10 bolt release pin or screw are made probably from imported pewter I can't buy from them anymore, The great Remington/Freedom Group co-op ruined Bushmaster and are on their way to messing up DPMS bad... quality is suffering over the old days. CMMG makes their parts in house according to two different guys that work the floor their. When I couldn't get a replacement bolt catch screw that broke on my Bushmaster AR-10 from either Bushmaster or DPMS, I called CMMG for help and the guy on the phone didn't trash the other companies but agreed with me that some parts quality seemed to be suffering. He mailed me three bolt catch screws... for free, and only asked that I consider doing business with them in the future. You don't get that every day with many companies,