I have a couple Charter Arms AR-7 Survival Rifles. Anyone have any experience with these. I love the simplicity of them. I was given two, one is the base model and the other has a pistol grip with a barrel shroud and steel stock. I also received 2 ramline 25 round magazines with them. Are these puppies any good for plinkers - from a quick search on the net I've heard mixed reviews. Apparently there is some way to increase there reliability with some type of modification? Opinions and information are welcome, thanks!