Just had a Ghost Ultimate 3.5 connector installed on my Glock 19. The armorer said he polished the contacts. Frankly, not sure its really that much improved, and in fact the pull may now be inconsistent, seems like longer/higher on pulls some than others. While I like the gun, overall have to say I remain very dissapointed in their trigger. My 1911s and nice rifles have spoiled my trigger finger.