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Hi Andrew and welcome. Yes, the Kel-Tec SUB2000 in 5.7x28mm is designed to accept FN Five-seveN magazines. It is compatible with both 20- and 30-round FN magazines and can also use aftermarket magazines like this ProMag 55-round drum. Cheers and stay safe!

Yes, it will fit & function properly.

Good evening to you!! Yes the Kel-tec Sub 2000 chambered for 5.7x 28mm will accept and function properly with the pro-mag FN 5.7x28 drum magazine. Have a good rest of your weekend.