"R" is a Remington bolt. Rapid firing of a SHT rifle means nothing. The problem is if the cartridge case fails the rifle does not do a good job of holding the failure inside the rifle. The very hard steel of the receiver will/can/might fail and you will/can/might lose a finger/eye/head. I think this is a put together parts gun. But understand the RA barrel has worth, the stock has worth and so does the triggerguard. All valuable parts.