I don't know if it is necessary, but I did it in my G20. I put a 22 lb. spring and a polished stainless guide rod in my gun and it runs like a champ. Recoil is softer than with the factory 17 lb. spring and with the stouter spring my gun runs everything from the weak 10mm stuff up through 220 gr. @ 1200 fps loads with complete reliability. I don't see a downside to putting a heavier spring in the gun.

Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats.