A 7-8# spring was what I found balanced reasonable trigger force with being able to set off any primer out there (including the now "old-style" Brown Bear, who has made huge improvements in primer consistency). In the XR9, this strength spring would not be overkill since a hammer-operated pistol will still not hit as hard as a pre-loaded striker. My delrin rod test show 36-40 inches travel with preloaded striker (or some pre-loaded hammer) pistols. This is only matched by my Sig P226 (SA/DA) with a very heavy trigger pull (about 12#). By the way, one tradoff with striker-fired pistols is that the slide force must be high enough to keep the slide from moving back when actuating the striker spring. With a hammer-operated gun, the slide spring only has to be strong enough to overcome gravity and maybe some holster rubbing.
Hasn't Rohrbaugh now gone to a higher trigger force as standard? I think I read somewhere that it was now 11#.
Also, does Rohrbaugh use a strong firing pin return spring to help reduce drop-firing, or do they use a passive firing pin safety?
