The still shaken lead guitarist of The John Abbott Band – a country act on stage in Las Vegas hours before the mass shooting – said he’s completely changed his mind about supporting the Second Amendment.

Caleb Keeter says he is now calling for an immediate ban on guns.

“I’ve been a proponent of the 2nd amendment my entire life,” the Arkansas-born Keeter posted in a heart-wrenching letter on Twitter Monday.

“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, he wrote.

“They were useless.”

Keeter, who lives in Denton, Texas, when he’s not on tour, explained having the guns on hand was actually worse than not having had them at all.

“We couldn’t touch them for fear police might think we were part of the massacre and shoot us. A small group (or one man) laid waste to a city with dedicated, fearless police officers desperately trying to help, because of access to an insane amount of fire power.

“Enough is enough,” he said, adding that he penned goodbyes to his parents and his romantic partner because he didn’t think he was going to survive the bullets being sprayed across the Las Vegas Strip by crazed gunman Stephen Paddock.

“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.”