How do I use a .bsg file?

AC-1 (auto-cannon APC)

uploaded by Mazur 3 weeks ago


AUTOCANNON APC!!
posted by ADBOSm 3 weeks ago
well
posted by ADBOSm 3 weeks ago
you gave me the idea to build a APC
thank you
posted by ADBOSm 3 weeks ago
almost done
posted by ADBOSm 2 weeks ago
done