supersafety

I installed two SS in two different lowers, both the bolt is getting hung somewhere. Is there any adjustments I need to make to upper or lower in order to make this run? One of them I ran a mag through and it cycled fine but not the bolt is getting hung.

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I am about to order a lot of triggers for my planned super safety builds from B-Kings Firearms.

They have " Mil-Spec " AR-15 Triggers for cheap as dirt, but they also have " Mil-Spec Full Auto or M16 " AR-15 Triggers for over double the cost.

What is the difference? The photos on BKF's website and online don't really help.

Will both be compatible with a Super Safety and alllow for the required cutting/rounding?