I will say this: if, after the trigger group was repaired, it misfired once, but none since, he needs to just keep shooting it and see what happens. The incident at the Nationals is certainly upsetting, but as each thousand rounds passes without trouble, so does confidence return. He may be through the shakedown period. Shit happens, even with Perazzis, Krieghoffs, and Kolars.
JR

Be strong, be of good courage.
God bless America, long live the Republic.