roller is the first generation attempt. I would say it is the worst and each successive attempt got better. you have to remove the gun from the action to see what you have.
#1 roller will work on the back of the trigger.
#2 arm pivots off the magwell to front of trigger.
#3 arm is sandwiched between 2 tabs instead of one on magwell floor plate.
2 & 3 can be upgraded with a Rifle Basix trigger with the finger spur cut off. the basix uses coil springs for better tension control.
any of the 3 factory triggers can have the wire spring replaced for lighter ones also.
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