Sounds like the trigger is not resetting / follow thru.
Before calling go with the stock (heavier) Hammer & trigger springs, based on past experience with light triggers i used the stock springs. . Then switch out the buffer spring, they have 2 (the heavier of the two has a rubberish coating on one end) If you used one of their buffer springs, switch back to stock recoil unit. . BUT it may be an issue with the 9mm ramped bolt.






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