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Hi John and welcome. You would need these :https://www.trippresearchinc.com/10r-10mm-rg/ ---------------------------------------------------- https://www.speedshooter.com/product/tripp-system-magazine-1911-10rd-10mm/ ------------------------------------ Cheers and stay safe!

John, not really, this will work with any standard full sized 1911 magazine in 10mm but only one place makes a extended 10 round magazine for 10mm 1911's and that's the highest capacity available. If interested just google the model number (10R-10mm-RG) and you'll find the 10rd magazine that'll fit this. Sorry but hope this helps.

The highest capacity magazine you can get for this will be a 10 rounder.