Level 2 - Sawed-Off: Corleone's Compound, New York. Immediately you leave the compound through the main gate, go straight forward, and turn left. There is a hedge that can be burned with an arsonist. The shotgun is behind there.
Level 3 - Schofield Semi-Auto: Global Storage Chop Shop, Florida. Inside the small warehouse on the right side of the island. The mission in Florida must first be completed to unlock the bridge.
At the 'Main' menu select 'Options' and then go to 'Enter Unlock Code' and type F5RE-ZYHJ-TGC2-29MG. Play the first mission in Single-Player and when you reach the 'The Corleone Compound' you will be able to recruit Tommy Cipolla.