Need suggestion:  I have a Bushmaster AR15.  I have purchased the EOTech 557.223 and a Promag PM136 fixed site.  The Promag PM136 sits too low so I thought I could buy a Mini Rail from Yankee Hill, YHM-226 to be exact, to raise the PM136.  Have received the YHM-226, it looked perfect, except it would not slide onto the rail.  I am told by the manufacturer that my rail must be different.

Short of grinding on the YHM-226 to make it fit, I need a rail riser to raise the PM136, just like the YHM-226, can anyone suggest anything.

Thanks

Bushmaster lists their rails as Picatinny.  You might check this link; it lists the dimensions for both Picatinny and Weaver rails.

http://en.wikipedia.org/wiki/Picatinny_rail