AN ACT REPEALING PRESIDENTIAL DECREE NO. 1866, ENTITLED "CODIFYING THE LAWS ON ILLEGAL/UNLAWFU L POSSESSION, MANUFACTURE, DEALING IN, ACQUISITION OR DISPOSITION OF FIREARMS, AMMUNITION OR EXPLOSIVES OR INSTRUMENTS USED IN THE MANUFACTURE OF FIREARMS, AMMUNITION OR EXPLOSIVES, AND IMPOSING STIFFER PENALTIES FOR CERTAIN VIOLATIONS THEREOF AND FOR RELEVANT PURPOSES