The Sprinco COR-BON model utilizes a stronger subspring in order to compensate for hot, +P and +P+ loads. A shooter should only use a COR-BON recoil reducer if he/she intends to exclusively shoot +P or +P+ ammo. The .40 Super, .45 Super, .400 COR-BON, and full house 10mm loads would also fit into this category. While the standard model Recoil Reducer will function flawlessly using hot ammo, this model does not reciprocate. Tame factory loads will not always cycle the COR-BON model Recoil Reducer, and you may have function problems. Keep in mind that the standard system will noticeably reduce recoil and muzzle flip when using hot ammo, but not as effectively as the COR-BON model would. In summary, if you are going to be shooting a wide range of power factor loads, order the standard system. If you are shooting hand cannon loads EXCLUSIVELY, go with the COR-BON system.