FKS-11 - For use in STI (1st & 2nd gen)/SV/SPS/CR mags (all calibers - except 1st gen STI mag, 9mm x 19mm spacer plate configuration), that measure up to 145mm long with a base pad attached.
FKS-13 - same as above but for up to 171mm magazine length
FKS9-11 - For use in STI (1st gen, 9mm x 19mm) magazines WITH spacer plate installed, that measure up to 145mm long with base pad attached.
FKS9-13 - same as above but for up to 171mm magazine length
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