JP Enterprises Silent Captured Spring Gen 2 Tungsten Weight

This JP Enterprises tungsten weight is made for Gen 2 Silent Captured Springs. Per JP, VMOS bolt carriers use the same masses, so it fits those as well. It swaps in for one or more of the steel weights already in the unit to add reciprocating mass.

JP calls it out for curing bolt bounce. Trading steel weights for tungsten lets a Silent Captured Spring do the job of a heavier H2 or H3 style buffer. Check which generation you have before ordering: JP says first generation SCS guide rods are stainless and Gen 2 rods are bronze.