The kit is supplied with the reverse lock-out plunger in the designed position and this should work well for most applications.
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The shifting action reminds me of a high quality bolt action rifle, my Barrett M99 comes to mind.
Loosen the lock-out plunger with a 5mm Allen key, the plunger body is also threaded and can be rotated with your fingers, either inwards or out to change the setting of the plunger.