303 British Laser Bore Sighter to 12 gauge adaptor

thingiverse

Adaptor designed for convenient bore alignment laser usage in a standard 12 gauge chamber compatible with the 0.303 British calibre. Simplify your shooting routine by utilizing the same laser device for two firearms instead of buying separate ones... Conveniently sight in or test technique without expending live ammunition, a major advantage for shooters. Always keep safety paramount when handling lasers. NOTE: Under no circumstances should this laser be used with live ammunition - doing so would be perilously foolish and potentially deadly. Using standard dimensions common to both 303British and 12 gauge cartridges as guidelines, the adaptor was meticulously crafted. The outer radius of the adaptor was skillfully reduced by 0.25mm to allow a snug fit in shotgun chambers while the inner radius was intentionally increased by 0.5mm for seamless 303 cartridge accommodation. With precise printing on the Up! mini 3D printer, no manual filing or sizing adjustments were necessary. Additionally, the base of the adaptor underwent smoothing treatment to remove support material residues. Furthermore, embossed writing surrounding the adaptor was expertly coated with liquid paper and scraped flat when dry to improve WARNINGS legibility