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The MCarbo spring is a good start. Easy to do and OP should get to know his gun to be able to clean it properly anyway. Polishing the Sear w/o 'major mod work' is also easy. You don't need to 'stone' or file the sear to Improve it. I polished the 'sear rail groove' and the receiver 'rail' it runs on, then lubed with Permatex PTFE Grease from CT. A world of difference.