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It's just due to the Pad on a Aluminum stock
it has a spring system built in "The revolutionary patented 'GL-Shock' absorbing Buttstock contains a recoil-reducing mechanism with a built in premium silicon chrome alloy spring creating a State-of-the-Art stock for your M4/M16"
Elbert, the FAB Defense GLR-16 6 position shock absorbing stock has a "progressive "Silicone Coated Spring" that decelerates the recoil travel backwards. Works exactly as a mini shock absorb-er.
it has a spring system built in "The revolutionary patented 'GL-Shock' absorbing Buttstock contains a recoil-reducing mechanism with a built in premium silicon chrome alloy spring creating a State-of-the-Art stock "
