Well since this topic was dug up I figure I would reply here instead of starting a new thread.
I am also having issues with inserting a fully loaded magazine (10 rounds, as I live in California) into the mag well when the slide is in the forward position. 1-6 or 7 rounds in the magazine and it will work fine, however if there are 8 or 9 it is stiff to push in, but when there is a full magazine, I really have to slam it in, and it is extremely hard to do, sometimes I have to try a couple times.
I know the round is hitting the top of the slide, because when I remove the magazine, the round is scuffed and sometimes dented on the top.
I am not sure if anyone has this difficulty or not, but I have a feeling it may be due to how they modify the magazines for 10 round only capacity. On the side of the magazine they have indentions which are the same angle as the follower and are the whole length of the side of the magazine on both sides, which will prevent the follower from going down any farther than where 10 rounds should be.
This is not my magazine, but it is similar to this
I have a feeling that because these magazines are made specifically to prevent adding any more than 10 rounds, that the follower does not allow any room for the found at the top to tip downward upon hitting the slide.
My main concerns about this are I may not be able to insert a magazine when I need in a life or death situation, as well as potential damage to the weapon from repeated hits to the slide, as well as potentially damaging a cartridge which may catastrophically fail.
I am not sure if anyone else other than the OP has run into this problem or not, but any advice or recommendations would be appreciated.