Yes, a standard Beretta M84 (and 84F/84FS) magazine will fit and function perfectly in the Girsan MC 14 T. Factory-compatible magazines are readily available, ranging from standard 10-round and 13-round capacities up to 18-round extended magazines.13-Round Magazines: Standard capacity magazines, often produced by reputable manufacturers like Mec-Gar, are widely available and match the factory specifications for the Beretta 84 series and the MC 14 T.10-Round Magazines: Restricted capacity versions are manufactured for compliance in specific jurisdictions.Extended 18-Round Magazines: Higher-capacity extended magazines are available from aftermarket manufacturers such as ProMag.

Hi James and welcome. Beretta 84 Magazines will fit. You can find specific MC 14T Magazines in stock here; wikiarms.com/guns?q=741566906282 ------- Cheers and stay safe!