I was recently informed by a Navy rangemaster doing some work with the Coastguard that the Robar breakdown .50 cal stocks were having problems. He witness these problems firsthand.
Evidently, when they are taken down and reassembled repeatedly, they loosen up. They develop enough play that the extra movement during firing causes the barrel to slap the bedding under the forearm. This subsequently causes the bedding to shatter and fly out under recoil. Naturally, accuracy begins to suffer rather quickly.
They have returned a number of rifles to Robar to be repaired for this reason.
Evidently, when they are taken down and reassembled repeatedly, they loosen up. They develop enough play that the extra movement during firing causes the barrel to slap the bedding under the forearm. This subsequently causes the bedding to shatter and fly out under recoil. Naturally, accuracy begins to suffer rather quickly.
They have returned a number of rifles to Robar to be repaired for this reason.