Kelblys atlas & MPA

Depends on the trigger i believe. You may have to take a dremel to the inside of the chassis to fit the trigger.
With my impact (also uses a hanger) i had to slightly dremel the chassis
 
I had a Kelbly in an older BA chassis and currently have one with a trigger tech and the trigger hanger in the MPA hybrid chassis. It just drops right in both.
 
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