Helping a Friend dead trigger

[RCKable]

Okay folks this what we got going on with a 9mm PCC, The trigger is not resetting, pull it, one round comes out and trigger is dead. Even with 115 blazer. The next round does go in without any issue and the bolt goes completely forward.
The build, Aero EPC lower, Taccom upper, taccom standard bolt, LeadStar 16” barrel, mil spec carbine buffer tube, hyperfire Elite trigger. Kynshot 5020SS, springco orange spring. What might be the cause of the trigger going dead? Is an A5 buffer tube required? New Trigger? 
Everything works fine when we try adjustable taccom buffer system. 

Edited June 4, 2023 by RCKable
Next round goes in fine

[busdriver]

You need an A5 tube to run the 5020 buffer.

[4mike]

 

 

 

Edited June 5, 2023 by 4mike