Glock 21 - 10mm conversion parts

[ILikeFtLbs]

I can't find uppers for sale anywhere right now. Who has used a conversion barrel to convert a standard G21 to a standard length 10mm? The only barrel I see is Firedragon. Here are my questions:

What brand barrel are you using?
What spring weight? (I'm thinking about using 22-23 pounds, but I don't want to damage the locking block with increased slide return speed)
How does it function?

Also:

Does anyone make a 5.5 inch barrel with porting? (I think that will help with the lighter slide)
How does the high powered ammo like Double Tap and Buffalo Bore work in the conversion?
Any damage?

[ColoradoGlocker]

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[40Magnum]

G21 with a 10mm conversion barrel in it is a G20. Everything sans barrel & magazine is the same between the two. I have a KKM as mentioned above and it works perfectly. Factory loads, the G21/G20 factory spring is fine. Hot loads, most use a 22 lb spring.

[ILikeFtLbs]

I have both the G20 and the G21 and the slide has a lot more metal and weight on the 20. That's why I'm concerned about doing damage to the slide or locking block. Idealy, I'd like to get a whole replacement upper, but I can't find any, so I'm looking at a conversion. We gun fans just can't help but tinker I guess.

[Lowrider 49]

Is there a problem with using the KKM 6" barrel in 3 pin, gen 2 G21? The reason I ask is they caution about using a gen 2 G22 for a .357 Sig conversion due to extra pressure. 10mm certainly has more pressure than the .45ACP.

Abyone doing this successfully??