I was so excited to go shoot my M4 after drooling for one for many years. I took a box of Winchester #6, Spartan #00, and about 5 Winchester 1oz slugs. I was never to get the gun to shoot more than a couple of shots in a row. A lot of my issues was FTF and when it did fire I get FTE. I even resulted in loading one shell at a time with no improvement. I don't know if I need more of breakin period, different ammo, or if something is wrong with my M4. If I was depending this to defend my home I'd be in a whole mess of trouble, guess I could've use it as a club. Any ideas/suggestions are greatly appreciated. Thanks,Thomas...