Smith & Wesson M&P Base Pad and Insert only no Spring for 9mm/.40 and .45
For High Capacity magazines only.
Will not work for ten round magazines.
Models: M&P 9mm/.40 and .45
We recommend using an extended spring with the 9mm/.40 Base Pad.
Extended Base Pad, adds 3 rounds in M&P .45
5 rounds in 9mm
Extended Base Pad and locking insert
This is an extended base pad with insert that give you 5rds in 9mm and 4rds in .40, plus 3rds in .45acp. We do suggest using a longer spring.