Real Avid Smart-Fit AR-15 Vise Block

Designed to expand to provide a snug fit with any .223 / 5.56 lower receiver, the Real AvidA(R) Smart-Fit(TM) AR-15 Vise Block is the most advanced vise block on the market, favored by professional armorers and home AR builders across the United States. Lightweight, yet rugged polymer construction protects firearm finishes, while simultaneously providing plenty of strength and stability for reliable service under heavy torque. Simply insert the block into your lower receiver and rotate the adjustment handle to tighten it against the receiver. It's that easy! Plus, the AR-15 Pivot Lock (included) keeps the upper receiver locked open for quick access and quick cleaning.