Six years after killing unarmed 17-year-old Trayvon Martin, George Zimmerman — who was recently charged with misdemeanor stalking a private investigator working on the upcoming Martin documentary series — is and will still be allowed to carry a gun, even if he's found guilty in his current case.

This is because Florida doesn't bar people convicted of misdemeanor stalking from carrying guns, only if it's a felony. However, the P.I. is fighting to get the charge bumped up to a felony, which would take away Zimmerman's right to carry if found guilty.

Zimmerman was recently charged with stalking Dennis Warren, a private investigator hired to track people down to participate in Jay-Z's upcoming docuseries. According to Warren's police report, he left one voicemail for Zimmerman to participate ... and Zimmerman responded with 185 calls, texts and emails over a nine-day span, threatening Warren and his family and saying he'd show up at his home.

The Seminole County Sheriff requested Zimmerman be charged with felony aggravated stalking, however, the state attorney disagreed and filed a misdemeanor charge instead, claiming there wasn't enough evidence Zimmerman made a "credible threat."

Documents obtained by The Blast show Warren is fighting back, trying to get the charge bumped back up to a felony – a move that would potentially take away Zimmerman's right to carry.

We're told Warren, a former law enforcement officer, sent a letter to the state attorney, breaking down each of Zimmerman's threats and arguing how his case "clears the hurdles and standards" required and noted the misdemeanor decision left him "very confused."

The letter adds, "I have taken numerous preventative measures to protect my family but I don't seem to get the same level of protection from the State Attorney's Office."

The difference between a misdemeanor and a felony charge is the difference between guns and no guns. Warren believes the alleged crime warrants a felony charge this time, something Zimmerman has never been convicted of.

Since his acquittal, George Zimmerman has faced numerous legal incidents, arrests, and charges including several domestic violence-related aggravated assaults and various death threats. In every single one of those cases, charges were either dropped or not pressed.

You'll recall, Norman Wolfinger, who headed the state attorney's office during Zimmerman's murder trial, instructed the lead homicide investigator in the Trayvon Martin case not to press charges against Zimmerman because he didn't believe there was enough evidence. This despite the investigator's recommendation Zimmerman be charged with manslaughter.

Amid his fight to see Zimmerman face felony charges, Warren will be in court Monday to requesting that a judge grant him a restraining order.