This reply came from another topic, which I removed because it was redundant. The quote below is a quote from ericire12:
"$265 bucks for a conversion...... $389 for used G17 (I've seen them regularly in $350 range)
http://www.budsgunshop.com/catalog/product_info.php/cPath/654_774/products_id/411535918Like I said in another post....buy a used G17. You would not save as much money shooting 9mm as you would with a .22 conversion and you would not recoup your investment as fast.... but you would have a Glock in a real caliber to add to the collection. It will also be a better shooter and give you more realistic practice.
Or just buy yourself a dedicated .22 caliber pistol to practice with -- also would be a better shooter and yield better practice.
*Also, reference Bane's comment here:
http://www.downrange.tv/forum/index.php?topic=4559.msg54242#msg54242"
Thanks, Eric. My purpose for the conversion is to practice with the gun I carry. I shoot the G30 at IDPA matches and their classifiers. In practicing with gun I carry, my theory is that I will become more proficient with it and be able to handle it without having to think about it should it be necessary. To be sure, I will practice with regular .45 ACP rounds but nowhere near as much as with the .22 LR.
I remember a SG episode where MB is talking about this issue; MB if I have this wrong, please correct me. He was saying, and I am paraphrasing him, that the body doesn't really differentiate between shooting the .22 and larger calibers, it's the muscle memory that is generated that is key.
And thanks to the others for providing their feedback. I will wait to see if a better solution emerges at SHOT.