* Designed to replicate function of a Carbine Buffer System* Steel buffer body, phosphate coating * Compact Buffer* Proprietary short pistol buffer weight Carbine- 3.7 oz, Heavy- 4.6 oz, H2- 5.5 oz, and performs like a traditional carbine buffer setup in combination with our flatwire buffer spring* 100% made in houseThis is a Proprietary part and will only work with the KAK short Buffer Tube and our Flatwire Buffer Spring.