Hadron Airsoft Designs has added the USP Compact TDC (Top Dead Centre) to its growing line of external hop-up upgrades. The unit, which ships with a matching nub, allows players to adjust hop-up on the Tokyo Marui USP Compact GBB pistol without disassembling the slide. The design follows the same top-down pressure approach used in Hadron's previous TDC releases for the Mk23, G18, G17, and HK45 platforms.

Engineering the unit for the USP Compact required additional development work due to the pistol's tighter slide and frame dimensions. The process involved multiple revisions and community testing before reaching its final form. Paired with quality GBB rubbers such as the Sniper Mechanics Flamingo 50/60, the system supports BBs from 0.28g up to 0.40g and beyond.

The upgrade is CNC-machined and replaces the stock hop-up mechanism with a direct top-down contact design aimed at improving BB flight consistency and trajectory. It is suited to players using the USP Compact as a sidearm or in CQB roles with heavier ammunition. The USP Compact TDC is available now through Hadron Airsoft Designs.