DS-15 Fixed Mag

I’m experiencing frequent double-feeding issues with the factory-installed Magpul 10-round plastic magazine in my DS-15. I recently came across the CompMag, which seems easier to load, and I’m hoping it might help reduce the double-feeding problems. However, since both the Magpul and CompMag are fixed magazines and can’t be easily removed once installed, is it permitted to swap the factory-installed Magpul magazine with a CompMag? Reading below FAQ not helpful. https://www.compmag.net/frequently-asked-questions-faqs/