P220R Conversion Kit Question

[P220ST]

Please forgive my ignorance as I'm a new (almost) gun owner. I bought a P220 which normally shoots 45ACP rounds. However, I want to do some cheap plinking and shoot some 22 or 22LR rounds at the range. I provided links to both conversion kits below in case you aren't familiar with them.

http://www.sigsauer.com/sigstore/ShowProductDetails.aspx?categoryid=103&productid=266

http://www.sigsauer.com/SigStore/22lr-conversion-kit-with-threaded-barrel-315.aspx

Does anyone know any pros/cons in doing this conversion? It won't be permanent as I'll probably still want to shoot some 45ACP rounds at the range and also keep it as a 45 for home protection. I mentioned this to a friend who is also fairly new to guns and he muttered about reading something online that conversions are bad for guns.

Lastly, does anyone recommend one or the other as I only want to buy one of them. I believe the 22LR is more for rifles which I don't think I can accurately shoot that far with a pistol anyway. Also, I'm not sure if the threaded barrel is illegal in CA (Silencer attachment?).

[rubber duckie]

i love my .22 conversion kit for the p226. it will be the best accessory you can buy for your gun. i find myself shoot only .22 when im at the range, then switching back to the .40 upper when it finds its way back into my house. the only bad thing about the conversion are the mags. they are plastic, and will not lock the slide back. i wish for the price of the kit/mags, they would make them out of metal and be possible to lock the slide back on last round. you will love the conversion kit, don't listen to what people say about them being unreliable, and needs expensive .22s. my conversion hates the expensive mini mags, it shoots the best with cheap bulk ammo.

[Sam Z]

I believe threaded barrels on a pistol are a no no in CA

So while you can purchase the kit in your second link, the moment you attach it to your frame is when you run into trouble

the regular kit in your first link is probably a better choice

see thread:

http://www.calguns.net/calgunforum/showthread.php?p=6602960#post6602960