You might see if there are any YouTube videos on the potential sights you are considering, or if someone has a video on replacing sights on the 3913. I'm not sure if some retailers have original sights for sale. I'll bet there are several after-market brands that are good quality and reasonably priced. I check lots of videos on various topics. Sometimes you have to ignore 80% of what they say because it's off topic, repeated or just unscripted but sometimes there are nuggets of information - and the video closeups - that gives me the information I am looking for.
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