To remove the front site you need castle nut pliers and an allen wrench for the set screw (maybe a gas lock wrench to break to torque.
Midway has pliers, gas lock wrench, and unitized cylinder. Everything but the piston. Pistons can be had all over. I usually buy them direct from sadlak when they have them in stock. Fulton armory has everything you want, though their gas cylinder price is a tad high.
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