Find the perfect performance driven 50 Cal AR 15 for your needs here at Bear Creek Arsenal and shoot with unmatched accuracy! 12.7x42 is an amazing caliber that allows you to shoot up to 400 grain bullets from the AR platform. 12.7x42 rifles are renowned for their high stopping power, making it an excellent hunting rifle capable of taking down just about any large game in North America at short ranges. Our 12.7x42 (50 caliber) rifles are built and tested for performance, precision, and durability so you never have to worry about taking your next shot. And if you prefer to piece together your own build, check out our quality selection of 12.7x42 uppers or barrels and create something truly unique.