Holborn Gunsmithing Business Profile Contact Information ToolBox 1,420 Views 0 Testimonials Print This Listing Add To My Favourites Holborn Gunsmithing Holborn Gunsmithing, Guns & Gunsmiths, in Warren Ontario. Holborn Gunsmithing Location Warren, ON Address 8960 Hwy 17 E, Warren, ON P0H 2N0 Telephone 705-967-0940 Category Guns & Gunsmiths Location Warren, ON Address 8960 Hwy 17 E, Warren, ON P0H 2N0 Telephone 705-967-0940 Category Guns & Gunsmiths