Because low cap mags don't sell and may be sitting on them for years.My concern is that none of this is BGFs fault except possibly the magazine. My question would be why would a place take 1 of 2 mags and replace 1 with a low cap? Id be willing to bet the guy that shipped it didn't include 2 hi caps. Now if it were an expensive one off piece I could maybe see that, but they have bucket loads of hi cap mags. Why would anyone swap a mag for a gain of $5.00 and ruin future visits from a potential customer?