The magwell is held in place by a very clever wedge arrangement -- you stick the well onto the bottom of the gun, and a wedge fits into the backstrap channel. You turn an allen screw on the bottom, and the wedge bears against the channel, "expanding" such that it locks in. Really cool, because most magwells are metal and a cheap looking screw goes through the backstrap. Besides, I like that it is plastic - matches the frame! To remove it, you just loosen the allen screw. No alteration or damage to the gun.

I prefer a dot or something on the front sight and a plain black serrated rear - no lines, no dots. As to the airy sight picture, I prefer that for most pistols, but that is just my eyes, I don't claim that is best. For a pin gun, you really want fast sights, and the skinny front and open rear allows me to see more of what is going on. IOW, I see more of the targets and that extra space allows extra target information to be seen, which makes it a faster setup.

Remember, in a pin match I may have 5 or 6 hostage pins, that provide me only a 1" by 1" target area of the head of the pin that will reliably drop the pin with authority. The narrow front gets me on the head of a pin, where a standard Glock front sight will be 4 or 5 times wider than the head of the pin in my sight picture! The hogged out rear allows me to see the whole pin and the rack, and the pin jump as it is hit.