Just changed out the standard 5.5 lb. trigger pull to 4 lb. on a GSSF issue 34. Using the instructions for the 25 cent trigger job site (http://www.alpharubicon.com/mrpoyz/glock/). I used a Wolff Springs competition tigger pack, with shipping $15 direct from Wolff. Beware, it took almost 2 weeks to receive. The job was much easier that I thought it would be, requiring swapping out 3 springs. What a difference! Smooth trigger pulls with enough weight that I feel comfortable using it in IDPA.