Just thought I would add some info on what I have found with my trigger on my T3x. I found the trigger slightly heavy for my liking, even once set to the lightest position. So I looked into the springs & thought they were expensive for what they are. My spring was 8mm long with a 3mm o/d with a 1mm wire diameter. Anyway I didn`t find any immediate suppliers in this country on ebay at that size & with thinner gauge coils without ordering quantities to make it worthwhile. I then turned my attention to the grub screw wich holds the spring in & adjusts compression on the spring. The screw is an M5 x 8mm long grub screw, wich I replaced with an M5 x 6 long grub screw & retained the standard spring turned out to leave a small gap between the M5 grub screw & the other large allen cap headed bolt. Before threadlocking in place I worked the bolt as hard & as fast as I could 4-5 times & also bumped the base & butt pad of my Oryx chassis ( this made my hand sore ) about the same amount of times with safety off to check all was safe & it wouldn`t accidentally fire. This for me so far has resulted in a much nicer trigger pull. I`m in now way suggesting people do this, as I`m not a gunsmith, but thought this may be useful knowledge for some.