smithjohnj
Sr Member
After the P90 introduction as a part of Project 9.0 (to replace the 9 x 19 mm Para) in 1990, FN revised the 5.7×28mm ammunition from the SS90 to the SS190, which was about 3 mm shorter. This allowed it to be used in the FN Five-seven pistol. The SS190 was released in 1993, replacing the SS90. The P90 magazine was adapted to use the shortened ammunition the same year.
EDIT: The P90 never used the 5.56 but other FN platforms do.
EDIT: The P90 never used the 5.56 but other FN platforms do.
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