what is the difference between the regular disconnector and the bullet proof disconnector, how do they function differently? — 1 Answer

The Bullet Proof unit is machined to a much higher quality and is meant to be an upgrade to the standard model in regards to fit and finish. The following is the descriptions provided by Wilson Combat for their disconnectors:

MPN: R30
These 1911 Auto parts meet or exceed factory specifications. If you're building a gun, or wish to bring your gun back to spec., these parts will provide exceptional service.

MPN: 573
Machined from tough alloy billet steel for a lifetime of function and wear resistance, this disconnector has been engineered to provide flawless function, enable light trigger pulls and to reduce drag on the slide. Works best with our Bullet Proof ® Ultralight hammers and deluxe Bullet Proof Sear (#314) in carry or competition pistols.