This paper critically reviews the proliferation of Small Arms and Light Weapons (SALW) in Northwestern Nigeria, examining their sources, implications, and connections to rising insecurity. Drawing on a wide range of scholarly and institutional literature, the study highlights how both locally fabricated and imported SALW contribute to terrorism, banditry, and cross-border crimes, particularly in states like Zamfara where herder-farmer tensions have escalated into armed conflict. The review also explores global trends, regional vulnerabilities, and the porous borders that facilitate arms trafficking, while identifying key research gaps such as the gendered impact of SALW and the role of emerging technologies. It concludes by emphasizing the need for targeted policy responses that combine security measures with socio-economic development and regional cooperation.