Nice work! Do you have a source for the heat shields? I just picked up an Ordnance marked Stevens 620 and would like to install one. I'm also looking for a military buttstock. Unfortunately, my shotty has 3 different serial numbers, so it's as mixed as you can get. I have the same forearm as you have on the 620A. Is it also correct on the 620? I see yours has the checkered one.