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No Sir but, CMMG makes a +10 extension for the Factory FN 5.7 Magazines : https://www.midwayusa.com/product/100605950

Unfortunately other than the 30 round promag Wich is known for reliability issues I cant find any extended magazines. Did find magazine extensions, Midway USA has some decently priced. Its just a baseplate that replaces the one on your original magazine to extend it. Hope this helps.