Bang by Norah McClintock

Reading hi-lo fiction is always a treat.  This titles in the Orca Soundings series is written at a Reading Level of 3.0, but is intended for secondary school students. 

Quentin and JD are best friends and they get into trouble.  Big trouble.  As in guns.

The plot is simple, the sentences are short, and, unfortunately, things do get wrapped up a little quickly at the end.  But it's only 103 pages and reads like a short story.  If you don't have any Orca Soundings books in your secondary library, you should!