Shop › MIDWEST G4M M-LOK 12.625" HNDGRD BLK MIDWEST G4M M-LOK 12.625" HNDGRD BLK $198.95 Midwest Industries Gen 4 M-Series Handguard, M-LOK, Fits AR-15 Rifles, 12.625", Black MI-G4M12.625 Quantity: Add To Cart Added! Midwest Industries Gen 4 M-Series Handguard, M-LOK, Fits AR-15 Rifles, 12.625", Black MI-G4M12.625