I am in the middle of machining my 555th bending jig. and gots a few question
1- my tapco flat has some dimples other then the mag well dimples, do i need to machine a pocket for them ?
2-the angle is messing me up does it matter if the angle is on top or bottom ?
3-the large end of the height of the reciever,the inside measurement doesnt match up with all the blue prints that are out there what should it be

I didn't build my bending jig..  so I am of little value other than..

yes, you will have to mill out for the magwell dimples..  the X/Y dimples, the selector dimple..  I think that is it..  as it is 1am and I am not sitting in front of my jig right now..

bump for more help

I sold mine but I believe it had relief cuts for the selector dimples. If I understand your question the angle should be on the bottom as when you are done bending the jig is parallel to the press with only the rails sticking above the jig. In other words you can only put it in one way that is right. Inside dimensions are the same throughout the receiver. Its the jig dimensions that have to be different so that the jig doesn't just shear or cut the flat. Hope that helps.