Here's a picture of the two I currently have. One is a Springfield Mil Spec which is a lot of gun for the money, and a 1951 Argentine Army Sistema Colt. I just picked the Sistema up last weekend at a gun show here in Ohio. I wasn't really looking for one because I had my mind set on saving for a SA Operator, but when I saw this one, I couldn't resist. plus the dealer was desperate to sell something. So after I sold a Auto Ordnance M1 Carbine, this beauty went home with me. I cleaned her up and she is beautiful ;D! The deep blueing is mesmerizing and she looks like she wasn't shot very much. I am having problems getting the mainspring housing off. It won't budge. Is there a way to nudge it off using a rubber mallet?