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CMMG, Inc Auto Sear Trip And Anti -Bounce Weight Kit, .22 ARC
$81.99 $62.99 Save 23%
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Most Helpful Positive Review Awesome little kit
works with fostech echo with slight modification. Works in full auto without issue. I bought it for the anti bounce weight to help with bounce in a AR with BFSIII trigger and found if you cut off the tabs on the sear tripper it will work with the Echo II trigger
Most Helpful Negative Review very misleading
This product led me to believe that it would convert my 22 long rifle conversion kit into a fully automatic kit. It will not unless you have a fully automatic lower. I'm not going to return this product, due to the fact that I was not wise enough to see the true intention of it
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Misleading

by Cjb, Verified Owner from WI, United States Written on January 6, 2026
NOT FOR FRT! Cmmg recommended to use bore buddy after they told me it wouldn't work. Very disappointed with this.
Pros:
  • None
Cons:
  • cheaply built
Best Used for:
  • Full auto lower
Would recommend: No
Was it helpful to you? Yes | No

auto sear for frt trigger

by vap, Verified Owner from MT, United States Written on July 1, 2025
I purchased this for a frt trigger, but it’s a lot more complicated then just putting this in. It does the job.
Pros:
  • Easy to instal
Cons:
  • None
Would recommend: Yes
Was it helpful to you? Yes | No

Works perfect in proper set up with CMMG 22 Conversion kit

by Stryker, Verified Owner from GU, United States Written on May 6, 2025
This CMMG Auto Sear Trip and Anti-Bounce Kit works Perfect with a CMMG .22lr Conversion Kit in a proper lower, like a Full Auto tax-stamp or other dedicated, correctly functioning lower.

The kit allows the hammer to reset and function in full auto mode when used with an accompanying CMMG Conversion kit, which will save money on ammo (.22lr vs .223 cost), give the shooter that grinning, giggling, fun factor of full auto rock n roll, and is easily swapped out when returning the rifle to .223 use.

Unsure if it works with binary triggers,ect but works perfect with a proper full auto lower.
Pros:
  • EASY INSTALL
Cons:
  • Might not work with binary triggers
Best Used for:
  • Inexpensive full auto fun
Would recommend: Yes
Was it helpful to you? Yes | No

Works perfectly.

by m4a1sof, Verified Owner from FL, United States Written on February 6, 2025
Works great, no issues at all. Finish and machining are excellent. I have another one that I bought about ten years ago. That one has been flawless as well. I noticed the new weight has a slightly different shape so I weighed them, the old one weighs .717 ounces and the new one 1.26 ounces. Apparently they felt the need to make it heavier but the old one has worked fine for the last ten years.
Pros:
  • Works as described.
Cons:
  • None
Best Used for:
  • Full auto firing.
Would recommend: Yes
Was it helpful to you? Yes | No

Bes t.22lr upgrade smooth & reliable

by Tevin Wallace, Verified Owner from AR, United States Written on August 29, 2024
No problems yet I’m really impressed and it Runs like Butter definitely a big recommendation if want the extra little spurt of excellence out of you bolt carrier group.
Would recommend: Yes
1 of 1 found the following review helpful.
Was it helpful to you? Yes | No

Total trash

by JR, Verified Owner from OH, United States Written on March 13, 2024
These need to be redesigned, they are so thin on the one side that I’ve had 4 break in 3,000rds.
Pros:
  • Provided dimensions to make my own
Cons:
  • Bad design
Best Used for:
  • Specs
Would recommend: No
3 of 3 found the following review helpful.
Was it helpful to you? Yes | No

May need tweeking to work properly !

by Ted, Verified Owner from SC, United States Written on January 28, 2024
The part that trips the sear was twisted and would bind in the upper receiver when installed. It is not very far off, but you may have to twist it a little to get it to work properly. It should move freely forward and back when installed in the upper for those of you needing this part.
Would recommend: Yes
1 of 1 found the following review helpful.
Was it helpful to you? Yes | No

Distorted right out of the box, and trip tab broke on first bolt rack before a mag was even in it!

by TexMac, Verified Owner from TX, United States Written on October 24, 2023
Trip frame was VERY distorted, right out of the box. Not sure how much “correction” this design can take, but oiled it up anyway and tried the first bolt rack. Tab broke off, first dry bolt rack — NO GO! The bounce weight also had sharp edges at the forward end, which I lightly sanded round, so it wouldn’t eat my upper, but I suspect the side “wobble” it has would do it anyway, even if I ever did get to finally chamber a round!
Pros:
  • None. Train wreck from the start.
Cons:
  • VERY thinly and cheaply stamped, and never even got to the first round.
Best Used for:
  • Refuse, or very small door wedge!
Would recommend: No
Was it helpful to you? Yes | No

Excellent and Works

by Anon, Verified Owner from AZ, United States Written on January 27, 2023
Perfect and functional on a proper setup, no toy triggers here. With a Reliability Kit by Taccom 3G (no plug, a KNS picatinny end plate only) and the plastic CMMG charging handle to increase reliability for the .22 round does everything to make it run just fine.
Pros:
  • Simple 2-piece Part
Cons:
  • None
Best Used for:
  • Proper setup as designed.
Would recommend: Yes
1 of 1 found the following review helpful.
Was it helpful to you? Yes | No

Received damaged.

by Skyler James, Verified Owner from UT, United States Written on December 15, 2022
I received the post and it was damaged. one of the sides of the sear was bent out so it jams and doesn’t let the bolt cycle. It was not caused from shipping because the box was still perfect. It was sent out damaged. When I manually forced the bolt to cycle it did work with my Echo II. So it leads me to believe that if the sear was not bent it would function like it’s supposed to.
Would recommend: No
Was it helpful to you? Yes | No
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