contoured foam designed to fit almost any ear canal comfortably

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5mm neoprene and nylon Spandex®

and long shifts behind the wheel

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Real Avid Smart-Fit™ AR15 Vise Block AVAR15SFVB Puncture Resistant contoured foam designed to fitReal Avid Smart Fit AR15 Vise Block AVAR15SFVB LOWER RECEIVER BLOCK THAT ADJUSTS FOR A ROCK SOLID FIT The Smart Fit AR15 Vise Block is the last lower vise block youll ever need. The patent pending block expands to fit any . 223 5. 56mm AR15 magwell, making loose, sloppy fitting blocks a thing of the past. Insert the block into the magazine well and simply rotate the adjustment handle to tighten the fit. This block can also be used with an inverted