Grip safety spring

[Arvid61]

Just got an M&P 10 and wanted to change out the grip. On dismantling the original grip I found two small springs- one is for safety but what is the other one ??
In the new magpul grip there is only one hole for the safety spring?
Any advice ?

 

[JRD]

You still need both springs. The thicker wire spring is for the safety. The thinner wire spring (may be color coded blue) is for the takedown pin. Only the safety spring needs a hole down into the grip to fit. The takedown pin spring is in the receiver and doesn't need to stick into the grip. The factory grip has a shallow hole to help locate that spring, but if you are careful not to kink the spring when you install the grip, you don't need the extra hole.

 

[Arvid61]

Thanks - very good explanation !