8a72190d____Official_Team_Fortress_Wiki__Exists_on_360
[Title] Level 3 Combat Mini-Sentry Exploit [Description] Whereby an Engineer could build a Combat Mini-Sentry that fires rockets by building a Level 3 Sentry Gun, switching to Gunslinger (either by respawning or using resupply lockers), then re-deploying the Sentry Gun. The resulted Sentry Gun would take only 2.5 seconds to build like a Combat Mini-Sentry, but fired rockets like a normal Sentry Gun. [Exists on PC] No [Exists on PS3] Never Existed [Exists on 360] 
Never Existed
N e v e r E x i s t e d
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Exploits - Official TF2 Wiki | Official Team Fortress Wiki
Exists on 360