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Depends on WHICH nickel finish.
Colt used a Satin Electroless Nickel (also known as "Coltguard") and standard bright nickel.
You can use a very mild polish like Flitz to GENTLY polish the plating.
Note that Satin Electroless Nickel is not intended to shine like a mirror, and attempting to polish it will damage the finish.
Bright nickel is intended to have a mirror-like shine, but use the polish with great care. Bright Nickel is not a particularly durable finish, and can be damaged by heavy or often use of polishes.
Gently use the Flitz to clean and lightly polish the gun, then apply either a thin coat of CLP Breakfree or a paste wax to protect the finish and keep it looking good.
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