Weapons question

http://www.seibertron.com/heavymetalwar ... r_id=69596
How is it possible he's able to use a Sniper Rifle?....there a glitch/shortcut/cheat or something?
Edit: ok, now im a lil confused, cause in the mission he hit me with a slingshot instead of the sniper rifle. but how would it be able to change if he's in the cr chamber currently.
How is it possible he's able to use a Sniper Rifle?....there a glitch/shortcut/cheat or something?
Edit: ok, now im a lil confused, cause in the mission he hit me with a slingshot instead of the sniper rifle. but how would it be able to change if he's in the cr chamber currently.