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The stuff i use is from Brownells its a two part liquid comes in two 1 Lt bottles.
Works great just add the two like they say then add distilled water and in a few Hrs or less the nickle is gone but the steel is not Touched.
That would be you! Get the proper screw drivers, a diagram and learn your gun you wont regret being able to take apart and replace parts on a thunderer.
Its called Brownells room tempeture nickle remover
Thunders or lightnings arnt that hard to take apart if you can use a slot screw driver your good!
Dont look to hard at the hand spring tho or they Break!
there one spring that does about 3 diffrent jobs so bust that and your hooped.