A standard AR buffer and spring make noise. The spring twangs and the buffer rattles in the tube every cycle. The JP Silent Captured Spring replaces both with a sealed, guided unit, so the action cycles quieter and with a smoother impulse. For a shooter, the appeal is a cleaner-feeling rifle that settles faster, plus the spring noise next to your ear goes away, which matters more on a suppressed or SBR build.
This is the Gen 2 version with the H2 buffer weight. JP positions the H2 weight for short-barreled rifles, suppressed rifles, select-fire guns, piston systems, and any build the maker recommends a heavy buffer for. The system is captured, meaning the spring and weights ride on a guide rod inside a housing, so nothing flies out during disassembly. JP includes a spacer so the same unit installs in both carbine- and rifle-length buffer tubes. JP lists the weight at 6.9 oz.
Two things to know. It does not fit A5-length tubes without JP's separate A5 spacer. And the captured design is heavier and costs more than a plain buffer and spring, so a shooter who is happy with a quiet enough standard setup may not need it. The payoff is the smoother, quieter cycle and the ability to tune mass with JP's tungsten weights.
