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The optional screw is the same as the factory one. We added these to the website because the factory ones have a habit of snapping if the buffer / buffer tube are not screwed in enough and the bolt travels too far to the rear and hits the back of the receiver. Akso the factory screws are fairly cheap and the head sizes are all over the place. Sometimes they fit into our charging handle.....sometimes not. Ours however is matched to the handle and will always fit.
$5 oversize lettermail in a padded envelope.
These guys are machinists not logistics experts.
I've left multiple orders in the shopping cart due to shipping costs.
To be fair, multiple vendors play the same game with shipping, from crush washers to bolt buffers and other small parts