I bought a PA M4 a few weeks ago for my Hi Point carbine. I like it so far except for that it shut off for a minute or so during my first session with it. PA said it was probably a bad battery cap, they sent me another one but I haven't been back to the range since I got it. Gotta restock my 9mm supply, that little rifle is just way too much fun to shoot, and since I bought an Uplula it doesn't take long to waste four or five boxes of ammo.