TANDEMKROSS Mark PRO Extended Magazine Base Pad (Mark IV 22/45, 2-Pack)

The TANDEMKROSS Mark PRO Extended Magazine Base Pad is the cheapest path to a competition-style Mark IV 22/45 magazine. The two-pack of anodized aluminum base pads replaces the factory polymer floor plate on the Ruger 90599 10-round magazine, adding bottom weight for cleaner mag drops, a flared reload-indexing surface for consistent palm strikes, and an aesthetic match for any anodized-aluminum Mark IV build.

The base pad is frame-specific. The TK26N0237BLK1 SKU fits the polymer-framed Mark IV 22/45, 22/45 Lite, and 22/45 Tactical magazines. Owners of the steel-frame standard Mark IV (Target, Hunter, Competition, Lite) need the TK24N0238BLK1 SKU instead, which fits the older Ruger 90231 mag. The pads do NOT cross-fit between the two frame families.

Capacity stays at 10 rounds, the base pad is a footprint-and-weight upgrade rather than a capacity extension. For shooters who run a six-mag stockpile, two two-packs ($50 total) convert four mags to competition spec for less than the cost of two factory replacement mags. Drop-in install with one screw, no fitting required.