class vn_lmgmag_base; class vn_m60_100_mag: vn_lmgmag_base { ACE_isBelt = 1; }; class vn_pk_100_mag: vn_lmgmag_base { ACE_isBelt = 1; }; class vn_rpd_100_mag: vn_lmgmag_base { ACE_isBelt = 1; };