URSA-SEC HK MP5 .22 LR RRS (Carbon Fiber)

The URSA-SEC HK MP5 .22 LR RRS (Carbon Fiber) is a rapid reset system, URSA's name for a forced reset device, made from PA-6 carbon-fiber nylon for the Umarex-made HK MP5 .22 LR in its rifle, SD, and K pistol forms with the factory trigger pack. It interacts with the trigger bar as the bolt cycles and forces the trigger forward during the reset phase, so every round still takes its own trigger press. It works with the gun's factory two-position safety, which still blocks the trigger. It does not fit the GSG MP5 .22.

URSA is blunt that this is a tuning project rather than a drop-in. Small differences between rifles change how the unit contacts the trigger bar, so expect to fit, test, adjust, and test again. That is where the carbon-fiber version earns its place: it is the cheapest URSA unit to experiment on, and URSA's own guidance is that many owners dial in fitment on the polymer part and keep a spare on hand. URSA also warns that rimfire ammunition is inconsistent enough to make out-of-battery ignition the real risk on a tuned .22, and tells owners to stop and inspect after any split or bulged case.

URSA backs it with lifetime support and replaces parts that wear out or break in normal use, but sales are final. Move to the steel version once the gun runs if you want a longer-wearing part. URSA does not sell its rapid reset systems into jurisdictions where they are prohibited; verify current federal, state, and local law before purchase.