Mr. Freeman is correct, Bobcat uses SW receivers for their weapons, and their quality has been hit or miss.

I have a SW-5FS that works flawlessly, but I had a SW-32K that was problematic with magazines. It seemed it functioned only with the 5 rounder that was supplied. My advice, take it to the range before your "examination period" expires, and fully test it. If something shows up, send it back. It will cost as much to fix it as it did to purchase it.

For your curiosity, check out http://www.hk-54.com/board/index.php , the owner of SW has a personality to say the least......