Stop feeding it garbage and stay away from handloads until you know the rifle works on quality factory ammo. Go buy some decent ammo and try again after you check to see if your gas key is tight and if the gas block is aligned correctly with the gas port. Try slipping a piece of tubing over the gas tube where it comes into the receiver and blow into it, if it's hard to blow through you either have a blockage or it's not aligned correctly.
If you are using a standard carbine buffer and spring you should be fine. A lighter or heavier spring or buffer would be more for fine tuning the system not making it work. An AR is fairly overgassed to start with so it should cycle unless there is something physically wrong with it like a loose gas key, too small of gas port, misaligned gas block, missing gas rings, etc...
When you cycle it by hand does the bolt and carrier go all the way back? Did you use a rifle spring or buffer in a carbine tube?
Did you assemble it from new or used parts?
Is it wearing away any coatings on the BCG or receiver internals?
Oil? AR's like oil.
More details and we can probably find a solution.
Good luck
). The gas port was misaligned but not on the rotation axe(left/right) but depth of the barrel( don't know if that make sense ). I had to move my gas block forward, leaving a small gap of around 1/8" between the thickness part of the barrel and the gas block.
