What PSI to get an AR-15 action to cycle?

[Fx51LP308]

Who is the maker of the parts kit with the crappy mag release?

I believe it was CMMG parts, one of the house brands of "Primary Arms." Usually, they're very good. Although I did get these replacements from Optics Planet.

 

[hlee]

Looks like you had a 308 bolt catch.