In 2011 in the US according to the FBI UCR...

...there were 751,131 aggravated assaults; an aggravated assault is a perpetrator causes or attempts to cause serious injury.
http://www.fbi.gov/about-us/cjis/ucr/crime-in-the-u.s/2011/crime-in-the-u.s.-2011/tables/table-1

Of those 21.2% involved a firearm. That's a bit over 159,000 incidents.

Such incidents may be cases where one person involved in an altercation draws a gun and fires whether the bullet strikes someone or not. Also included in that number are crimes such as kidnapping and rape where the gun was used as a threat to subdue the victim.

About 73,883 firearm injuries due to all intents are recorded for 2011. Those would include attempted suicide, criminal assault, law enforcement shootings, negligence, accidents, etc.

http://webappa.cdc.gov/sasweb/ncipc/nfirates2001.html