Arrrrghhhhhhhhhhhh!! The damn trigger guard is absolutely killing me. I have 7.62's trigger guard rivet a jig and have tried every way that I can think of and I am not having satisfactory results. I wish I had what it takes to post a picture but I don't so I will do my level best to give you a blow by blow of the dirty details. Initially I set it up just like you ought to and when I pressed things together it squished the rivets but it also pused the domed rivet heads out and away from the trigger guard so that they did not sit flush, looks like crap. Next I tried clamping everything together, used a long bar clamp and a piece of flat stock across the upper rails. Clamped it all tightly together onto the press block, and then proceded. Same results. At first I tried it with the One-Pat group buy rivets and they were closer to the correct length but were too narrow. So I made up a bichen simple little jig that allowed me to cut 5 rivets to the correct length at one time in my mill. I have used the 5/32 rivets that 7.62 made the jig for, I mill them down until there is .100 sticking up through the bottom of the receiver. I brought home my air hammer from work and tried it, it worked better but still not good enough. On a whim I turned the jig over and pressed a set of rivets with out the divets that they index into. It did flatten out the top of the dome a little but otherwise it worked choice. So, that being the deal I chucked the jig up in my vice and used a ball end mill to drill another set of dimples on the other side. I purposely made the dimples a little on the shallow side. Now it is ringing my rivet heads, but when it is said and done with the rivets are in and everything sits flush. Then I went to the back rivet and it is doing the exact same thing. For something that was supposed to be dip $hit simple this has turned into a multi day/evening nightmare. So anyhow, not to high jack a guys thread, but if you have any other ideas or insight into it by all means enlighten me.
