Smith & Wesson M&P 9/40 – Magazine Extension – +3/+2 or +5/+4 – Black
PLEASE DOUBLE CHECK DETAILS AND FITMENT BEFORE PURCHASE.
Warne built these magazine extensions for Smith & Wesson M&P 9mm and .40 pistols to give you more capacity, better magazine handling, and a cleaner reload surface. This listing covers the black Warne M&P 9/40 extensions in either the +3/+2 or +5/+4 configuration, depending on how much extra room you want on tap.
Available options are organized below under Variants.
Fitment
Fits compatible Smith & Wesson M&P 9mm and .40 factory magazines. Warne lists these extensions for the M&P 17-round factory magazine.
Does NOT fit
Does not fit every M&P magazine blindly just because it says M&P on the slide. Verify you are using the correct factory M&P 9mm or .40 magazine before ordering. This is not a universal handgun mag extension.
What it does
These extensions increase magazine capacity while also giving you a larger, more ergonomic magazine base for better insertion and easier stripping if needed. Depending on the option selected, you get either +3 rounds for 9mm / +2 rounds for .40 or +5 rounds for 9mm / +4 rounds for .40.
Why it’s worth it
If you are running an M&P for range work, competition, or just want more rounds and a better magazine footprint, this is a clean upgrade. More capacity is useful. Better handling is useful. Funny how products work better when they actually solve problems.
Specs
- Fits Smith & Wesson M&P 9mm and .40 factory magazines
- Variant options: +3/+2 or +5/+4
- Black finish
- Lightweight aluminum construction
- Hard coat anodized corrosion-resistant finish
- Ergonomic design with finger grooves
- Designed and made in the USA
What’s included
One Warne magazine extension for Smith & Wesson M&P 9/40 magazines in the selected capacity option.
Tools needed
Basic magazine disassembly tools or a suitable punch may help during installation, depending on your factory magazine setup.
Install notes
Install carefully and confirm proper seating, lockup, and reliable function before live fire. After installation, test feeding and magazine retention with your specific magazine and ammo setup before trusting it.
Verify before you buy
Verify your magazine is a compatible factory Smith & Wesson M&P 9mm or .40 magazine. Verify whether you want the +3/+2 or +5/+4 option. Verify your local laws allow increased magazine capacity before purchase.
⚠ Trademark & Compatibility Disclaimer
IronKells Armory LLC is not affiliated with, endorsed by, or sponsored by any manufacturer mentioned. All trademarks are the property of their respective owners and are used only to identify compatibility or fitment.
⚠ Install & Compatibility Disclaimer
Installation should be performed by a qualified armorer or gunsmith. Improper installation, modification, or use may affect firearm safety and reliability. Buyer is responsible for verifying compatibility, performing proper function testing, and ensuring safe operation.
Buyer is responsible for compliance with all local/state laws regarding magazine capacity.
