What do you think of this 400 Corbon caliber? Have you ever converted a Glock 21 before? It's supposed to be just a barrel swap. No need to replace RSA or any other part. Experiences? I know we can do whatever we need to do with either 45 ACP or 10mm but it's not a "need" thing but in the "cool/want/awesome" wishlist I think it would be very cool even if ammo cost is quite crazy. Do you have one? pics? I'm a 357sig believer so I guess that necked down design caught my attention.