A harder hammer spring actually increases gas consumption. A tighter barrel and better hop bucking help very very slightly with gas consumption, but you are probably not going to notice the difference. Check the Nine Ball Dyna piston head, these do help with gas consumption a bit. But the biggest boost to gas consumption you would get would be from a lighter slide. Aluminum would help, the best gas efficiency would be from a TM 1911 plastic slide, but if you go that way, you would need weaker recoil and hammer springs.
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