Sig Sauer GRIP-MOD-F-943-M-BLK Grip Module Assy for 250/320 Models, 9MM/40S&W/357MAG, Full Size, Megium Grip, Black
From Official site:
Install your P320/P250 firing control unit into this Grip Module Assembly to convert to a P320 or P250 compact chambered in 9mm, .357 SIG, .40AUTO. Requires the 9mm, .357 SIG and .40AUTO slide and barrel.
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