KelTec 9mm. One round fired, next round did not chamber, so slide didn't cycle all the way.
Martin's clothing and flesh were burned; Zimmerman's clothing had powder residue.
-- but if you shoot someone/something from close enough you can often get residue back scattering. --
Yep. I figure the point was that Zimmerman hadn't fired on a 3 or 4 foot distant target, and my impression is he did not have his arm extended. All the forensic evidence is consistent with a close quarters shot.
Thanks - Not one I am familiar with (only handgun I have ever had was an issue Browning 9 mm), but yeah, sounds like a combination of residue blowback from a target closer than 3 feet away and the partially open slide.
The L96 or AS50 are more my tools of choice, though they are significantly more difficult to carry in your waistband!