That looks like a benchmark trigger frame and trigger. They have been known to be a bit loose. You can put shims on each side of the trigger to take
Just unscrew the trigger rod a little. It should sit a bout a credit card/business cards thickness from the back of the trigger. Looks to be a benchmark
I decided to bring my old mag back to life, I have kept it in a suitcase for 15 years.
I recently bought an X-valve and ULT