The trade publication said Saturday it reached out to Universal after it appeared the photo had been altered to remove the images of the weapons, which were mounted on the wall of the set.
The newspaper said the rifles were clearly visible July 10 but clearly invisible Friday.
The Reporter said the debate over assault weapons in the United States spilled into the "Kick Ass 2" camp this summer when star Jim Carrey tweeted he was troubled by the violence in the film -- particularly after the December 2012 massacre at Sandy Hook Elementary School in Newtown, Conn., in which 20 students and six faculty and staff members were shot and killed.
"I did Kickass a month b4 Sandy Hook and now in all good conscience I cannot support that level of violence," he tweeted June 23.
The producers had responded that they respected Carrey's politics but gave no indication they planned any moves to soften the level of violence in "Kick-Ass 2," which is scheduled for release Aug. 16.