I tried two different brands of plus one mag extensions in my 27. Both brands caused an occasional jam in this pistol that has never jammed. When I went to the non plus one mag extension the problem went away. No big deal, 9 plus one is enough. Although I only load 8 in the mag, that 9th one is tough to get in, worried about jamming the spring by keeping it too compressed with 9 in. Anybody else have a problem/solution for the plus one mag "problem"