Title says ar10 bolt catch - Strike Industries AR Enhanced Bolt Catch

it does not function on a PSA 3rd gen 308 upper with 20 inch barrel. it has to be modified and still doesn't hold the bolt open. the upper cannot be modified whatsoever due to the super thin profile. the catch shape keeps it from engagement all the way into lock position. so far out of 4 I've installed none work. it's part the upper and part the catch. do better PSA, and strike industries do not buy this thinking it's going to fix the lrbho problem.