claim: There are 30 knockouts part of the career boxing record of Floyd Mayweather Jr.
evidence: The Gryazev-Shipunov GSh-6-23 -LRB- Грязев-Шипунов ГШ-6-23 -RRB- -LRB- GRAU designation  : 9A-620 for GSh-6-23 , 9A-768 for GSh-6-23M modernized variant -RRB- is a six-barreled 23 mm rotary cannon used by some modern Soviet / Russian military aircraft .. rotary cannon. rotary cannon. Soviet. Soviet Union. The GSh-6-23 differs from most American multi-barreled aircraft cannon in that it is gas-operated , rather than externally powered via an electric , hydraulic , or pneumatic system .. gas-operated. gas-operated. electric. electric motor. Although the engineering difficulties involved in producing a gas-operated rotary cannon with such a high rate of fire are considerable , they create less of a drain on the aircraft 's power systems and are more reliable in combat , since they can continue to fire even in the event of a power system failure .. rotary cannon. rotary cannon. gas-operated. gas-operated. The GSh-6-23 uses the 23x115 Russian AM-23 round , fed via linked cartridge belt or a linkless feed system .. The linkless system , adopted after problems with the belt feed , is limited to 8,500 rpm .. Fire control is electrical , using a 27 V DC system .. The cannon has 10 pyrotechnic cocking charges , similar to those used in European gas-operated revolver cannons such as the DEFA 554 or Mauser BK-27 .. gas-operated. gas-operated. DEFA 554. DEFA cannon. Mauser BK-27. Mauser BK-27. The rapid rate of fire exhausts ammunition quickly  : the Mikoyan MiG-31 aircraft , for example , with 260 rounds of ammunition -LRB- 800 rounds maximum -RRB- , would empty its magazine in less than two seconds .. Mikoyan MiG-31. Mikoyan MiG-31. The GSh-6-23 is used by the Sukhoi Su-24 attack aircraft , the MiG-31 interceptor aircraft , and the now-obsolete Sukhoi Su-15 among others .. Sukhoi Su-24. Sukhoi Su-24. attack aircraft. attack aircraft. interceptor aircraft. interceptor aircraft. Sukhoi Su-15. Sukhoi Su-15. However , after two Su-24s were lost because of premature shell detonation in 1983 , and because of some other problems with gun usage -LRB- such as system failures -RRB- , usage of the GSh-6-23 was stopped by a decision of the Soviet Air Force Command .. Soviet. Soviet Union. At present all aircraft in the Russian Air Force are flying with fully operational guns , but without ammunition .. It is also used in the SPPU-6 gun pod , which can traverse to -45 ° elevation , and + -45 ° azimuth .. gun pod. gun pod