These are nice accurate guns that are fun to shoot. However, they do need to be cleaned regularly after shooting as they are prone to poor ejection if they aren't kept clean. Not much different than a High Standard as I remember.
There is a guy who has parts for these, including new magazines. Here is the last contact info I have for him (from 2000):
Gary Chatham
Chatham's Gun Parts
Route 1 Box 236 B01
Tennessee Colony, Texas 75861
Phone: 903-928-2400
At the time he had Triple-K magazines for about $30 each. I've also seen them on eBay at times.
Good luck!
Ivan