San Luis Obispo County Sheriff's Office NIPOMO, Calif. -- A Nipomo man was arrested for possession of guns after a probation search on Thursday. Around 10 a.m., San Luis Obispo County Sheriff's Task Force, San Luis Obispo County Probation Department and the Arroyo Grande Police Department conducted a probation search on the 300 block of Neptune Drive in Nipomo. During their search of the 20-year-old Nipomo man's home, they found several items that prompted a further investigation. Detectives say the items found were related to gang affiliation, a Glock Micro Conversion Kit, large capacity magazines and two assault rifles. Two of the firearms found were a Panther Arms A-15 semi-automatic Short Barreled Rifle and another was a semi-automatic "ghost gun" Short Barreled Rifle.