Timney Triggers Alpha Competition Trigger, Anodized Finish, Purple, Fits Large Frame Gen 3 & Gen 4 - 20, 21, 29, 30, 40 and 41 ALPHA GLOCK 3-4-LARGE-PURPLE With a factory pull weight of 3 pounds" the Timney Alpha Competition trigger answers the long call for a trigger that has the same feel and performance that matches the reliability of the Glock system by providing an improved trigger design that does not sacrifice any part of the Glock reliability. Staying true to their 76-year-old promise to their customers" this trigger can be installed easily with no gunsmith needed.