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the largest I can find are 10 round mags https://www.midwayusa.com/product/1018674025/polymer80-magazine-ar-15-50-beowulf-10-round-polymer

David, Press Check used to make 14rd Magazines. Don't know if they still do : https://www.youtube.com/watch?v=TVTSVowayL8 --------- 10rds seem to be the norm : https://www.midwayusa.com/product/1018674025/polymer80-magazine-ar-15-50-beowulf-10-round-polymer