I have a Piston for my AAC TiRant 45 that I never used...I sold my .40 S&W the day after I got my TiRant so I don't need the piston.


It is threaded 9/16x24 (or standard .40 S&W).

I am asking $80 shipped to your door. I accept Paypal (+4% for their fees or 'gift' option).