What you're looking for is the roll troll I think?
https://github.com/maduce/fosscad-repo/tree/master/Rifles/AR-15_Bolt_Lower_Receiver_v2.0-RollTroll
What you're looking for is the roll troll I think?
https://github.com/maduce/fosscad-repo/tree/master/Rifles/AR-15_Bolt_Lower_Receiver_v2.0-RollTroll