Glock Firing Pin Spring, 3 - 4 lbsFiring pin spring for Glock manufactured by Toni System. 3 lb Use with polished strikers and very soft primers 3. 5 lb For competition use. Lightens the trigger and maintains excellent percussion on the primer. 4 lb For trigger improvement, but requires reliability in all conditions. Compatibility Glock 17 34 Gen 3 Glock 17 34 Gen 4 Glock 17 34 Gen 5 Glock 19 Gen 3 Glock 19 Gen 4 Glock 19 Gen 5 Glock 19X Glock 45
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