I have owned 2 DBOYS metal bodies recently, the older of the two has a huge mag well. I needed to put a strip of electrical tape on either side of the interior of the well to get mags to fit snugly.
The most recent one I bought fits KA mid-caps like a dream. It also fits AdventureLine (TM) mags snugly, and my CA hi-cap fits like a dream.
Although, I installed a TM mag catch because I don't like the DBOYS one, and that made what was a tight fit (I had to tap the bottom of the mag to get the catch to lock) into a great fit (no tap, just smooth action).
So there's my experience.
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