I'd seen that too. Closer inspection its part # 14, likely damaged on install by ruger or bass pro with that rotary lock... on the fence about contacting ruger or just putting an aftermarket trigger in itNot seen it myself, but another older thread here said they had to increase the trigger pull weight adjustment to prevent it from sticking.
RPR trigger problem
After finally getting my RPR to shoot with a Green Mountain barrel I have a new issue: sticky trigger release blade, part number 17 When I cycle the bolt into firing position, the "trigger release" blade locate inside the trigger is hanging up. i.e. it is sticky. I have cleaned the trigger...www.snipershide.com