I got two of the Advantage Arms conversions, one for a Glock 30, the other for a Glock 22. With ammo they like, they are very reliable and accurate, and they come with adjustable sights, so you can set point of aim with their preferred loads. Both of mine dislike CCI Blazer .22s, but run well with Remington or Federal bulk-pack HV hollowpoints. I paid $260-$280 for the conversion kits, but they seem pretty durable, and the cost savings over shooting .45ACP and .40 S&W one hundred to two hundred rounds a practice session should make them pay for themselves before too long.