I have not used the D-T trigger in the 77 MKII which is what I am assuming you were speking of. I've used the Timney and another I can't remember the name of right now(CRS)... They are a bit dicey to install but worked well when correctly installed. I have used the D-T trigger on a small ring mauser(94-96 Swedes) and it was a total joke.. The D-T trigger had to be 'fixed' so that it would reset before I could install it.. Never more quoth the raven!! The 77 MKII trigger can be worked to a resonable trigger but I always tell the client, 'If it comes to grief, I install an aftermarket'.. I haven't had to install that aftermarket yet but have come close...I also had bad dreams with the safeties on the 77MKII's...