M*CARBO
Urethane recoil buffer for the Sub 2000 that cushions the bolt at the end of travel, decreasing felt recoil by about 30% on Gen 2 and Gen 3 guns.
On the Sub 2000 the bolt bottoms out hard at the rear of its travel, which is part of why the gun feels snappier than its 9mm chambering suggests. M*CARBO's Recoil Buffer is a proprietary urethane blend that sits in the bolt's path and absorbs that impact instead of letting it transfer straight into the receiver and the shooter. M*CARBO rates the felt-recoil reduction at about 30%. It is a drop-in internal part and one of the cheapest upgrades on the platform, which is why owners usually buy it alongside the trigger spring kit and recoilless charging handle. Note the fitment: M*CARBO lists this buffer for the Gen 2 and Gen 3 only, not the original Gen 1.
Add the M*CARBO Kel-Tec Sub 2000 Recoil Buffer to your build and see how it enhances your platform.