1. Drive out the pin holding Century's bipod, pull it off
2. Cut off the tack weld on the muzzle nut with a dremel and remove the nut
3. Drive out the pins holding the front sight block and drive it off the end of the barrel with a BFH
4. Slide RPK bipod on, drive the front sight block back on, drive the pins back in place, replace muzzle device.