[furrycowthingy]

What are some durability upgrades I can put in a CA M15 before I tweak the performance?

 

[metallicafatcat]

Honestly, not much. Reason said is that CA uses slightly off spec parts as compared to a TM box, or atleast they have for me. I'd recommend getting better compression, rewiring to deans and 16AGW, reshim, relube and metal bushings if it doesn't already have them.