Birchwood Casey Plum Brown Barrel Finish produces a rich, authentic, old style brown finish for original or replica firearms. Ideal for restoring antique guns, muzzleloaders and other metal antiques. A durable, protective and attractive finish that's simple to apply. Just heat metal with propane torch or other clean, convenient method and apply browning solution with swab. Immediate results... no waiting for old-fashioned slow rust process which can take weeks to finish. 5 or 32 fl. ozs. State Size.