The Pro-Mag is what I used, around 16.00 online. There is a larger "delta wing" style also but I like the Pro-Mag since it's basically the same size as the stock safety, just taller. No "replacement screw" included with the Pro-Mag, I put a small piece of duct tape (sticky side in the screw slot) and backed the factory screw out without any damage. Also on the Pro-Mag safety when I installed it I tried it with the factory spacer (the little metal piece under the safety) and without it. Seems to work smoother without the spacer. Make sure you have the bolt in the full open position when you remove the safety and watch out for the detent ball and spring or else you'll be getting a lesson in the full disassembly of the gun!!! BTW the Pro-Mag will fit with the raised portion either to the front or the rear, just see what works best for you if you go with the Pro-Mag...