SIG P320 Magazine Brass Base Pads

Description

For USPSA, IDPA or any competition with division weight limits, ensure you weigh your setup! 

Each pad features a 3-by-5 matrix. Number your mags using a Sharpie or paint pen. Additional space is available to write your initials.

Weight Comparison – P320

• Brass (P320 Extended Pad) – 106 grams
• Brass (P320 Standard) – 31 grams
• Our Grayguns Hard Duty Use Aluminum Pads (P320) – 26.9 grams
• OEM P320 base pads – 5.7 grams

Standard & Extended Magwell Versions

• Select the extended magwell version if your P320 has an X-Series grip module with a magwell installed. The extended base pads will fit standard modules.
• Select the standard version if your P320 does not feature a magwell. The standard base pad version will not fit pistols with a magwell.

P320 Brass Magazine Base Pad Fit Guide

As noted, select the correct version based on whether you have or will have a magwell. These base pads will fit 21-round magazines.

IMPORTANT—In 2024, SIG changed the “wing flanges” where base pads slide onto the magazine’s base. This increased the overall width by 0.3 inches. Our base pads are made to exacting standards and will not fit on newer magazines without alteration.

Please check the width of your magazines at the wing flange, as shown in the photos. If it is about .9350, you are good to go. If it measures .9650, you will need to fit the magazines. Our next batch (release date to be determined) of base pads will be designed to fit both widths.

The P320 base pads are backward compatible with all P320 modules, including the standard and xSeries, with or without the extended magwell installed.

Base pads are compatible with new SIG P320 magazines with square pegs. (See product photos.) Do you have the base plates with the round peg? If yes, you’ll need to purchase a P320 Inner Base Plate – Square Peg for each of your magazines.

We do not test the fit with third-party magwells or grip modules from other sources. These will fit the OEM SIG Sauer magwell and any magwells provided by Grayguns.

Brass Base Pad Product Reviews

We’ve separated our brass base pads by pistol model onto different product pages. (Previously, they were all together.) Click here to see previous reviews from before February 2026.