I've seen a website that documents the steps involved in smoothing and tuning a Marlin 94 action. I don't recall the url offhand, but, to summarize: Carefully very fine abrasive cloth, crocus cloth, and stones, polish, but do not remove any significant metal at the following points:
1. extractor hook engagement. extractor should snap cleanly over rim, and engage properly.
2. firing pin hole and bolt face. cartridges should slide smoothly over boltface. There should be no burrs to snag case head.
3. elevator/cartridge lifter. to minimize cartridge friction.
4. edges on chamber mouth. Chamfer slightly if sharp. remove burrs.
5. magazine cutoff. burrs here snag on next cartridge to enter lifter.
6. Cartridge guides (side rails).
7. firing pin travel. should have no burrs or places where firing pin hesitates in it's motion.
To summarize, use dummy cartridges and cycle thru action slowly and note every point where the cartridge case/bullet/casehead touches. The objective is to remove burrs, minimize friction, and allow cartridge to pass without being snagged or slowed down.
Clean all action parts with solvent to remove arasize, and lubricate. Re-assemble.
HTH
John