The firing pin is dropping not hitting the primer, has a different sound to it!
I am guessing that you either have to clean the trigger or adjust the spring a bit.... maybe both.
Check your trigger mechanics. If you pull the trigger kinda sideways you can drop the sear without the safety blade being clear first. Make sure you are pulling straight back...
Just put in a ESS MDT chassis. Was in a Choate tactical. would do it occasionally in it.
i have it out of the stock, not rubbing on anything. I cant replicate what it was doing at the range, seems like there is a lot of sideplay between the trigger and the safety blade.
try turning the accutrigger pull weight up and see if it changes anything.
Had same issue with my stock 12 F/V. Had adjusted the trigger down to 16 oz for bench shooting. If I did not have a good finger placement on the trigger it would move sideways and let the fire pin release but catch on the safety lever, locking it up. If I reset the bolt and try again it would fire (sometimes) needed to increase to 20 oz and problems went away but if I moved the trigger sideways on purpose it would sometimes release the fireing pin but again catch on the safety lever.
There is a kit that adds washers between the trigger and trigger housing to prevent or tighten up the sloppy trigger. This does help.
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