Why would you do that? Your defeating the main purpose of the Gen4. Increased reliability. So you turned your new Gen4 into an old Gen3 with a different texture. Now say you want to run a weapon light - and you are right back to why Glock changed. Also, the Gen4's shoot softer than regular Gen3's... So you are now giving the gun a handicap by making it also shoot Sharper... just so it doesn't feel as stiff when you hand-cycle it.
My impression was that the gen 4s had poorer reliability than the gen 3s. Gen 3s seem to work with just about any load, the gen 4s need loads on the hot side to function reliably. That's what I've heard, anyway. I have had some kind of annoying FTF problems with my gen 4 G23, when using a Lone Wolf barrel, that I never get with my gne 3 G19 and it's lone wolf barrel. Some of that may be due to 9mm having a slight taper while 40SW doesn't, but it seems reasonable to me that it could be the gen 4 recoil system vs the gen 3. For $20 I wouldn't mind trying it out, anyway, if there's a reasonable chance it'll improve the reliability. The Glock fanatic I mentioned (he's the Match Director for our club's annual GSSF match, so he's not just 'sum dood') seems to think I'll be happier with the gen 3 recoil system- he's much happier with his gen 3 Glocks than the gen 4s.
That's the theory, anyway.