i put 3500ish rounds through my slightly modded 22/45 with the threaded barrel before it had its first fail to feed...
reliable yeah, so long as the loaded chamber indicator is disabled. before i disabled it i had to clean every 250 to 500.
the balance with the polymer frame and the short barrel is perfect for me. i would go with either one you like the feel of. if you end up not liking it the frame is not the reciever so you can order whatever frame you want and have it shipped to you.
the barrel section is the registered part in the mark1-2-3 series.
whichever one you get heck out the ultimate clip loader it really works!!
fast forward to 1:15 to get to the point of the vid