303 British Laser Bore Sighter to 12 gauge adaptor
thingiverse
Adaptor to allow a bore alignment laser for a 0.303 British calibre to be used in a standard 12 gauge chamber. Why buy 2 bore lasers when you can use the same one for 2 firearms... Being able to sight in or test technique without using real ammunition is a big plus. NOTE: Do not use with live ammo... That would be unwise and potentially fatal. Instructions Using standard sizes for both 303British and 12 gauge catridges, the adaptor was created. outer radius was reduced by 0.25mm to allow clearance in shotgun, and inner radius were increased by 0.5mm to allow for easy fitting of 303 cartridge. Printed on Up! mini, no filing or size changes were required. base was smoothed to remove some support material. Embossed writing around adaptor was filled with liquid paper and scraped flat when dry, to increase readability of WARNINGS
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