Sorry, forgot to mention one key step: after inserting the magazine, use a pencil tip to push the magazine follower down. Otherwise, the slide is blocked by magazine follower.
This gun has dual hold-open mechanisms: internal hold-open catch and magazine follower. Both must be disabled to take the slide down. Inserting the magazine releases the internal hold-open catch, but the magazine follower must be disabled manually (inserting a magazine with snap-cap will work as well).
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