I know nothing about this, it came on a recent purchase and I have no use for it. Online research shows it to be a Rex Silentium High Performance Muzzle Brake for .30 caliber rifles. It’s in good shape and doesn’t appear to have been used, but, I can’t guarantee that. I’d like to get $30 shipped for it. PayPal f&f preferred but would take a check or money order.
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