Yeah, I wish I'd gotten in on the Weaponeer GB. I would love to have one of BRP's recievers to build on.
Hopefully BRP will make another run in the near future.
The ends of the rivet are almost hemi-spherical. To form the second rivet head after inserting it through the camming pieces, and make it look ORIGINAL, heat the end of the shank to cherry red with a oxy-acetylene torch, support the opposit end of the rivet, and form the head using a ball peen hamm...