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Hi Bryan and welcome. The rear of the upper/lower must be opened to drop the magazine and insert a fresh magazine. Details here: https://www.youtube.com/shorts/HyqFaXGdjU4 --------- Cheers, stay safe and enjoy!

Hi Bryan, Every California Compliant Bushmaster is equipped with a DFM 10rd magazine, and the lower receiver model is XM15-CA. The DFM® magazine requires disassembly of the action to remove the magazine. This means no permanent alterations are needed. The limiting tabs prevent release through the bottom of the magazine well and can only be removed from the top when the upper is tilted out of the way. So, basically, you need to remove a pin, tilt the upper up, then you can remove the magazine to load it. (It will not remove from the bottom as shown it the video linked below) Yes, it's a PITA but that's CA for you. Stay safe & have a great day!