I bought Camp 9 through an on-line auction two months ago. It looked like it had very few rounds through it. It's short and handy and I like the way it comes up to my shoulder. Before I shot it I ordered a replacement spring and buffer, they are easy to find and inexpensive, it's really important to get these installed before you shoot it. If you are buying something you can handle, make sure there are no cracks in the stock. This is a sure sign that the bolt buffer has failed and the shooter continued to use the rifle. Aftermarket stocks are available, but there are other parts in the action that are probably damaged.
The problems I've had with it seem to be related to the rifle having sit for a long time, an over night soak in solvent has helped a lot. Because these are blow back designs the action gets filthy pretty fast. I'm under the impression that if these are put away dirty and allowed to sit they'll get pretty gummed up.
Mine will not function well on aluminum cases, but seems to feed the cheap steel Russian ammo o.k.. It still stove pipes now and then. The gun came with a factory magazine which has been fine and an after market Pro Mag which has not. I recently bought a 17 round Mec Gar magazine that has been flawless. All my feed issue have been mag related.
The factory trigger on these is by far the worst trigger of any fire arm I've ever used. I think it's completely unusable. I sent my trigger group to a fellow in Colorado Springs who made it acceptable. Cost was $50.
I'm still in the process of trying to sort out the accuracy of this rifle. I've had some bad luck with two scopes that I put on it to test it, and I've been trying different ammo makers and bullet types and weights to try to nail it down. The jury is still out.
I have a Hi Point 4595 also. They are ugly as sin, but very reliable. If you're after a range toy/shooter the 9mm Hi Point might be one to consider, especially since they are a bunch cheaper. I like the looks and the wood stock of the Camp 9 and sooner or later I'll get all the issues worked out, but I'd be tempted to trade the pair for an M1 Carbine