The Fostech Echo trigger when in the third selector position functions as a pull and release style trigger, firing a shot on the pull and again on the release. It is ATF Approved and only functions out of the box with the supplied bolt carrier, this video may help someone who is trying to get it to run with an AR-22 conversion.
Parts needed
Fostech Echo Trigger
CMMG Auto Sear Trip Kit 22BA64D
CMMG Style 22lr upper with a
CMMG Bravo Receiver Frame 22BA4EB
and CMMG Bravo Bolt Assembly 22BA492
No tax stamp needed to own a Fostech Echo trigger pack but in some states full auto is defined differently and the trigger pack is not allowed in those states. This rifle is 100% ATF compliant and is a two tax stamp build, SBR and Suppressor.
Warning take nothing from this video as legal advice, and do not try to buy an auto sear, you only want the auto sear trip kit. Once modified the auto sear trip kit will be useless if you own any full auto’s so if you are a lucky legal FA owner then buy another sear trip kit to modify for your fostech echo trigger pack.
Note to readers: Please click the share buttons above or below. Forward this article to your email lists. Crosspost on your blog site, social media, internet forums. etc.
Fostech now has cmmg auto trip kits available with tabs already cut off. Just drop in and go. This is for Gen 2 triggers.
does your trip slide forward and back a little bit even when installed in your bravo even when the bolt is forward?
Is this the original Fostech Echo or the Echo II ? Saw someone stated on the Echo II all you need to do is remove the two tabs you mention and leave the tab the way it is. Wondering if someone can confirm this.
Like Robert, I broke a tab trying to get the bend dialed in. I ordered a MAPP setup and two more sear trips and will be trying again. One thing I want to clarify. You say if you have it bent too far back, it will not release the trigger on "the second shot". I encountered a scenario where no matter what it would not fire on the initial trigger pull, but would fire on the release. Any thoughts on this?
Need help! I bought the CMMG Bravo kit plus the auto sear trip kit. I have already removed the 2 side tabs and it is not working. I have the Fostech AR II (2nd gen) trigger. Does anyone have pics of how it is set in the upper? Any help is greatly appreciated.
Pete
Could I just buy the updated Echo trigger part for 25 bucks from Echo and cmmg part and not have to modify cmmg piece
DO NOT BEND ECHO V2 the bend will not work with the new model all u have to do is trim tabs on the side of youll end up sepnd another $40 on another auto trip
You do cut the tabs or it will not work . Cutting the tabs allows the trigger lock to reset it is more important then
the bend. And use a propane torch to do a good job.
Why cut the tabs? Aren't they needed?????
Very nice work! Are you selling the 22lr. modded disconnector catch? I would by a couple.
How about I send you an auto sear trip and you bend it and I pay you to do the bending for me?
Does this work with the drop-in conversion (uses same .223 barrel) or just the one that requires the CMMG barrel?
Thanks for this. Getting my parts in today. Going to give it a try.
So far I have broken two of the little auto trips trying to bend them to work with the echo triggerI was wondering if you could give a tip as to how to heat and bend itI currently have two more on order from CMMG