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OK. AR15.com suggests carefully inspecting the finger/leg of your bolt catch, to ensure that it is long enough to be reliably raised into the locking position by the mag follower.
I would also consider removing the bolt catch and checking it for burrs or wear--and stoning/relieving any possible high spots which might make it drag against the lower inletting under recoil.
Given the tiny amount of time the blot catch has to perform its function, any drag at all could be just enough to inhibit function.
I would also consider making sure that the roll pin fits loosely in the bolt catch hole, so that the bolt catch is perfectly free to pivot so it is not having to overcome any resistance as the mag follower lifts it into position.
Hope you get it sussed out.
I would also consider removing the bolt catch and checking it for burrs or wear--and stoning/relieving any possible high spots which might make it drag against the lower inletting under recoil.
Given the tiny amount of time the blot catch has to perform its function, any drag at all could be just enough to inhibit function.
I would also consider making sure that the roll pin fits loosely in the bolt catch hole, so that the bolt catch is perfectly free to pivot so it is not having to overcome any resistance as the mag follower lifts it into position.
Hope you get it sussed out.