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The main reason , I mentioned the thin case hardening , is you said you where going to lap the lugs .
Yeap the M40A1 will be nice when its finished , just had its brother out , the C3A1 clone (...

Just be careful , how much metal you remove from the outside surface , its my understanding , that the steel is soft , ie low RC scale , and the way they get strength is by the exterior case...