I have a CA M15A4 Carbine and currently it is bone stock. when I'm looking online for upgrade parts, I see a lot of stuff that says it's for TM M-series, are those internal parts compatible with my gun or is this a waste of time/money?
I also have a CA M15A4 Carbine. I plan on having AEX install a Guarder SP110 spring to reach 400FPS. I have a battery sling so I can hold a 8.4v 4200 mah battery which will pull the spring fine. AEX says the larger battery acts like a mini 9.6V. If you stick with a 8.4V mini, your ROF will decrease. AEX says the bearings and piston will be the first parts likely to wear out with the 9.6V. Have fun researching upgrades.