The new Gen 2 Seekins Billet lower features the Ambi bolt release. It also lists that it has a captive detent spring to retain the rear takedown pin.

Rainier's website notes that "Because of the rear take down captive screw, the detent spring will need to be trimmed down."

I find this slightly confusing because I was expecting the detent pin and spring to come installed. I'm not following the comment about the screw and trimming the spring.

Can anyone explain this a little better and possibly include a picture?

Thanks!