He was instructed by Clemenza to drop the gun before leaving the restaurant. He had already wrapped in in special tape that would resist fingerprints.
There was no time to 'physically dismantle' or drive to a lake to throw it into. Michael had to be immediately brought to wherever he would embark on the trip to Italy.
Leaving it at the scene was the best thing to do with the gun.
Apple
A wise and frugal government, which shall leave men free to regulate their own pursuits of industry and improvement, and shall not take from the mouth of labor the bread it has earned - this is the sum of good government.
- THOMAS JEFFERSON
| 
