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Advantage Arms out of CA makes a complete line of conversion kits for all glocks.Larry
I have a Glock 20 10mm and an Advantage Arms 22LR conversion kit for it and it takes only seconds to switch over to the kit.After trying several different types of ammo I found a couple that gave 1 1/2" 10 shot 25 yard groups.Here is a short video of my son shooting the G20 with the AA 22LR kit installed.http://www.youtube.com/watch?v=KFQ_8tei-NI