It was accepted into service with the  Bundeswehr  in 1997, replacing the G3. [2]  The G36 is  gas-operated  and feeds from a 30-round detachable box  magazine  or 100-round  C-Mag   drum magazine . [1] SG 550 The  SG 550  is an  assault rifle  manufactured by  Swiss Arms AG  (formerly  Schweizerische Industrie