The JE Machine AR-15 Stabilizer Buffer System V2 is at the forefront of AR buffer technology. This system is a drop-in replacement for the traditional AR-15 carbine spring and buffer. This revolutionary patented one-piece assembly eliminates many of the risks of other "cap screwed" recoil systems on the market while providing a reduction in felt recoil. The PS-BFSC4 is constructed from high-strength 4140 steel. This system is truly a testament to JE Machine ingenuity and is a must-have for new and veteran shooters alike.The Stabilizer Buffer System is specifically tuned for .223 and 5.56 ammunition. The internal spring weight is calibrated to handle the gas pressure and recoil generated by these rounds. While it can physically fit into any standard carbine buffer tube, JE Machine does not recommend using this product with other AR-15 calibers. Different calibers produce varying levels of force, and using the PS-BFSC4 with them may result in insufficient cycling, excessive recoil, or...