It is the TM-22 A12+ (that is the 12” pro metal version in black. Mine also has Alex’s Homebrew T charging handle, bolt hold, mag release, and 1-4X LPVO, plus magpul rail covers and hand stop.)
The rubber shock absorber/damper under the buffer tube gets slapped a lot and can eventually wear through. Adding a toonie stops that, but reduces the damping slightly. It's a common mod for that rifle.
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u/barofsoap89 15h ago
What rifle is this on/in?