I have a couple of questions on the older Glock +2 mag extensions (marked 1987 on bottom) on a Glock model 27. Is it legal to put one of the +2 mag ext. on a G27 factory mag? It increases the total capacity of the mag from nine to ten rounds when you do so. Has anybody used these older mag extensions with the newer mags and encountered any problems by doing so? (falling apart when bumped hard, etc). If you do install the +2 on your newer mag do you need to change the mag spring and if so to which one? (G19 or stay with G27 spring). I know many consider it a waste to increase the length of the G27 by putting any type of extensions on it, but I really like the way it feels with the +2 and I am increasing my mag capacity at the same time. I have been experimenting with this configuration and it seems to work very well but I just want to make sure that it is both - legal and safe. Thanks for the help.