The problem with cheapo 1911s and some not so cheap is they do not necessarily fit the definition of mil spec and thus while the gun you bought might function, it might well be the end of the line for parts if you can not put in or on mil spec replacement parts. This is especially important if you yourself can not modify the gun to do so. It does not take a RIA, Chinese or Brazil made firearm to be there, for example the new basic Remington R1 has sights on it from Italy, that are not mil spec. You want to put say Novak's on it, you have to recut the slots.
Ed
Ed