Full auto high standard supermatic trophy military :(

hi people,today i went to the range to setting my ultradot red dot sight in my pistol,but for my surprise,i shot one time and all bullets go to the target,because is in full auto. i think the problem is between the sear and hammer. is a regular fail on a high standard??? the hammer in my high standard is new.

new hammer, old sear? yeah, probably need a sear made to fit the new hammer.

Good idea when testing a rebuilt pistol to fire first with one round in the first magazine, then 2 (twice for me) then a full magazine.  This way you will find the problem in a safer manner.

I had this happen when experimenting with trigger adjustment on an old Walther GSP. Full auto can be embarrassing at a match and does not lead to great scores. I absolutely agree with test firing with two rounds after repairs or adjustments involving ignition system. dipnet

Did you put the spring on the sear bar in correctly?

I  had a Bereta go full auto when I dropped the slide. New firing pin. They all went down range.

Recently had that happen with an old Clark Longslide 45 that a friend dropped off for me to try. 
Very exciting moment! Glad I was shooting on my outdoor range. Had some leaves and small branches falling!
JKR