I have a Springfield XD9 4" barrel with 16 round magazines. I can fit 17 rounds into my magazines -- a tight fit but not too difficult to do. Is this OK, or does it create the potential for problems down the line?
I have never found any quality hi cap mags that will allow you to squeze in an extra round. Something isn't right, either a cheap mag or possibly a 40 cal mag. I can't speak about Springfield but I know that I can fit a 40 cal mag in my Ruger P series 9mm and vice versa. I put a red line on my 40 cal mags so they don't get mixed up as they look the same as the 9mm mags.
Those who hammer their guns into plows will plow for those who do not." ~ Thomas Jefferson
Originally Posted by Benning Boy
If you're really bored, I'm your huckleberry. If you really want a challenge, I'm the one.
If you're really smart, you'll just peddle your paint.
I don't know about your pistol mags but for my little marlin .22 i can fit 8 even though the box said seven. I think its a bad idea because it could cause a jam if you overload it (at least it did in mine) and it could screw with the spring. Not much good can really come of it, as JD said if its supposed to fit X and it doesn't fit X then there is something wrong with them probably.
Check your mag, I have heard that you can do that with a 40 cal. mag. One of the guys got the 9mm coversion for his 40 cal. and he loaded up those mags with 9mm. Had lots of feeding problems though. Check the XD talk forum for more details.