Curious/uncertain

Air Arms owners, 

I just got my AA S410 back today from being repaired(thank you David Slade). I have a new scope/rings I’ll be mounting in a couple of days. My question, is this a stop for the ring mount? If not, then do I need to do anything to it like tap it down flush with the top rail? Your input will be greatly appreciated. 
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That is indeed a scope ring pin if your rings do not have a matching hole, then simply remove pin. In firearms its common use is recoil and alignment. In air rifles it probably serves more of an alignment purpose as the recoil is minimal. However it should be noted that most firearm receivers are steel and can take a higher torque setting on scope ring screws, vs. air guns which are generally and aluminum action.