The Strike Industries OPPRESSOR Universal 3-Lug QD Base Set gives you an additional mount for another compatible weapon so you can use just one SI OPPRESSOR Universal body and quickly swap between firearms. This 3-Lug quick detach (QD) base is a unique fitment only to the SI OPPRESSOR Universal and includes all the necessary hardware to install on a compatible individual barrel. Made from S45C steel and includes a 1/2" concentric shim washer along with a 1/2" and 5/8" crush washers. Purchase as a spare or replacement base or so you can save some money and reuse the same SI OPPRESSOR Universal body on multiple weapons. Includes:x1 SI OPPRESSOR Universal proprietary 3-lug quick detach basex1 Shim (only used for 1/2" barrel)x1 AR crush washer for .223/5.56/9mm (1/2")x1 AR crush washer for .308/7.62 (5/8")x1 Warning cardx1 Installation order card FeaturesAdditional SI OPPRESSOR Universal proprietary 3-lug QD baseQuickly swap one SI OPPRESSOR body with mu...