Add a gun that can’t shoot straight to the problems that dog Lockheed Martin Corp.’s $428 billion F-35 program, including more than 800 software flaws.

The 25mm gun on Air Force models of the Joint Strike Fighter has “unacceptable” accuracy in hitting ground targets and is mounted in housing that’s cracking, the Pentagon’s test office said in its latest assessment of the costliest U.S. weapons system.

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The number of software deficiencies totaled 873 as of November, according to the report obtained by Bloomberg News in advance of its release as soon as Friday. That’s down from 917 in September 2018, when the jet entered the intense combat testing required before full production, including 15 Category 1 items. What was to be a year of testing has now been extended another year until at least October.

“Although the program office is working to fix deficiencies, new discoveries are still being made, resulting in only a minor decrease in the overall number” and leaving “many significant‘’ ones to address, the assessment said.

This procurement program really is a complete cluster-f%$#.