OK... SO I have an Alpha Arms Grand Slam in 284 that was purchased in 1986.. came with Beuhler Mounts and 1" Rings.. Changing it over to a 30mm tube now.. and wondering about the bases. Best I can tell, they are on a Mauser type action, but not sure if it has 96 pattern or 98 pattern. Anybody out there an expert on these obscure rifles? I have scoured ebay and all the used sites for a set of Beuhler 30mm, but have had no such luck..