It is the SPIDER!

Spike’s Tactical Tungsten Buffer

The Spike’s Tactical Tungsten Buffer is a great upgrade for the AR-15 / M-4 platform of rifles.  During the cycle of operations, the buffer serves to slow the rearward momentum of the bolt carrier group.  Problem being, the mil-spec buffers are filled with solid weights.  These weights bouncing around adds unnecessary movement to the rifle.  The Tungsten Buffer by Spike’s Tactical alleviates this problem by filling their buffer with granulated tungsten.

You can find the ST-T2 Buffer here .

The magic is on the Inside…