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Hi Doug and welcome. Same deal, since the Ruger is not fully mil-spec, I would confirm whether or not with Armaspec Customer Service at - https://armaspec.com/contact - Cheers and stay safe!

Hi Doug, if you lost yours, just call Ruger and they will send you another one. Here are links to Ruger AR556 detent & spring - https://www.mdsgunrepair.com/store/p1216/Take_Down_Pin_Detent%2C_Ruger_SR556%2C_SR762%2C_%26_AR556.html https://www.mdsgunrepair.com/store/p1217/Take_Down_Detent_Spring%2C_Ruger_SR556%2C_%26_AR556.html Stay safe & have a great day!