this question is just an inquiry, i know that micro red dots can be installed on a semi auto glock slide like this http://www.defensereview.com/stories/shotshow2008/GlockWorx_DocterOptic_3_SHOT_Show_2008_2-04-08.jpg but could it keep its zero if its installed on a fully automatic glock 18 ill probly never try this on a glock 18 but i have a doctor red dot on my glock 34