upper question - brand

[Urban Tactical Gear]

which brand was it that was offering a threaded pin for the bolt catch release pin?

[Quentin]

Quentin Defense billet lowers. Ask me how I remember that! [:D]

http://quentin-laser.com/store/product_info.php?cPath=2&products_id=184
(if you enlarge the picture you can see the pin)

[Stickman]

The Magpul billet lower was the first one I saw with that feature, I think there are a few that do it now.

[bcammons]

Seekins and Spikes billet lowers as well.

[madcratebuilder]

Has anyone tapped a standard lower for a screw-in bolt release pivot pin?