how long you had the gun?
if its failing... S&W has been good to me...
They will probablly send you a new one out.
Explain the situation and they are very helpful.
I dont need the whole mag i just need the springs i have the arredondo extention on my mags and the springs are weak so i am going to try a 14rd mag spring.
I actually had an issue with my S&W M&P 45C (MAG SPRING).
Let Smith know about it... they mailed the new spring out next day.
let them know.. and they will make it right... man I love S&W.