45ACP Pearce grip extentsions (issues)

[specopsxd]

Here is the link to the product : Springfield Armory XD Series

I was pretty excited when these came out because my 45 ACP compact just didnt feel right in my hand. I got this in conjunction with a houge grip (cut it down a bit) and it fits in my hand perfectly 100% . The only issue that I have is that they seem to slide forward. It seems that plates that hold it in with the small nub or nipple on them are to thin, or the gaps on the rails that slide or too wide. They slide forward really easy when the mag is empty and when the mag is full they slide forward with a bit of pressure. Certainly the type of pressure that you would be expected to exert on the weapon if you fall during a firefight or bump it up against something. and when this happens the bullets and springs go flying out like one of those pretend peanut things from the 80s. I am going to call pearce about this but I was wondering if anyone else has been having similar problems. FYI the stock magazine caps are solid and dont move at all.