Has anyone ever built any version of a Sig 510?
There's a good Peter Kokalis article in the Dec. 28 Shotgun News about this Swiss rifle. This was a roller locked rifle based on Mauser WWII designs that were intended to compete with the MP43/ STG44 series.
The 510-1 was chambered for the 7.5x55mm and was adopted as the StGw 57. The 510-2 was a lightened version that was not adopted. The 510-3 was chambered for 7.62x39, and was a prototype for the Finns, who did not adopt it. The 510-4 was chambered for 7.62x51 and was sold to Bolivia and Chile. The AMT was developed as a semi-auto only version for import to the U.S. as a sporting rifle--"American Match Target." Apparently less than 1500 ever came in.
Reason I ask is that there are some parts available, but so far I have not found anyone with bolt/carrier, cut receiver, or any compliance parts.
Looks like a build would involve a lot of parts fabrication.