OP was asking good and bad on Security Six. Bad is no longer made? Good is Accurate, I hit steel plates and gongs at 100 yrds. Strong, I will never wear this piece out. Easy on the eyes, wish I had more of them!
I had one many moons ago, and the trigger pull must have been 18-20 foot-pounds. If yours is less and pulls pretty good, then let it be. But, if you need a new spring set, use Wolff's. They are great guns, when they have a good trigger weight.