Question and some guidance
 

My Parker SBT handicap gun had what I would consider a typical 4 lbs. +/- trigger pull. Suddenly and inexplicably it now has a hair trigger and I mean HAIR.

1) Have any of you experienced anything similar?

2) Is this a difficult fix for someone who knows what they are doing (not me)?

3) Who would you recommend working on this? Time is of the essence.

There are myriad of possibilities, but the majority of the time it has to do with an obstruction by some material of the engagement of the sear to the hammer.
The only proper way to assure what is the problem is to remove the stock and observe the internals. By reinstalling the trigger plate to the receiver in close approximation to how it sits with the stock installed and observing the engagement of the sear to hammer, etc. It's also possible that the sear spring has cracked or weakened and is only pushing the sear up high enough to just barely engage.

My Parker SBT had what I would consider a hair trigger. I was kinda ok with it until I got my Knick and Fox and then I found the Parker trigger disconcerting. I sent it to Dennis Potter and he took care of it but I don’t know what his current work load is.

John ,it has been years ago , I had a DHE 28 Gauge with a Parker Single select trigger that wasn't working correctly although at the moment I just don't recall exactly what was going on with it ,none the less I contacted Dan May at Miller Trigger and sent the gun up to him and when it came home it functioned perfectly ! The contact I still have for him is (315-216-6240 ) ! As I said it has been quite a while hopefully this is still a functioning business and a working phone number He was a Fine Gentleman to do business with ! All the best getting her fixed !

I have seen this on doubles and as stated above, it is generally dirt or a worn or broken sear surface. Wear general comes on gradually. If it started suddenly, it is either something thatwas deposited quickly or a chipped or broken part. Either wear or crap laying down general comes on slowly in my experience. It may start failing to hold cock suddenly, but would generally give a lot of warning by getting lighter and sloppier over a period of time. Try a good soaking cleaning first maybe. If mechanical, anything that is working but not correctly can generally be repaired by a competent gunsmith. A sear and notch are pretty simple but must be shaped carefully.

Harry, was that a result of "quality reloads"? Asking for a friend. :)

I started to ask you how you could tell if it were 8 or 8 1/2 or 9 or 7 1/2 if it were flattened :rotf::rotf::rotf: