Caleb Keeter, a lead guitarist in the Josh Abbott Band, said he was a proponent of the second amendment before the horrific mass shooting in Las Vegas on October 1 that killed at least 59 people.
Mr Keeter said he feared for his life all night and has changed his mind on gun control in the United States, claiming it was "out of hand".
"I've been a proponent of the 2nd amendment my entire life. Until the events of last night. I cannot express how wrong I was. We actually have members of our crew with [Concealed Handgun Licenses], and legal firearms on the bus," Keeter tweeted.
"They were useless."
Mr Keeter said his crew members were too scared to grab their guns for protection, out of fear the police might think they were the shooter.
The country star said he regrets his stubborness when it came to relaxed gun laws, finishing off his Tweet with a fervent call for strict gun control.
"Enough is enough," he added.
"Writing my parents and the love of my life a goodbye last night and a living will because I felt like I wasn't going to live through the night was enough for me to realize that this is completely and totally out of hand.
"These rounds were just powerful enough that my crew guys just standing in close proximity of a victim shot by this f***ing coward received shrapnel wounds.
"We need gun control RIGHT. NOW. My biggest regret is that I stubbornly didn't realize it until my brothers on the road and myself were threatened by it. We are unbelievably fortunate to not be among the number of victims killed or seriously wounded by this maniac."
The band released a statement on its Facebook page claiming everyone in the band and crew were safe following the mass shooting.