These endcaps can be installed in a variety of receivers or chassis systems. Both styles can be used with or without an endplate. Castle nut is included with the Picatinny version.
Both styles have an adjustable preload for 22lr and other systems that require this. A tube of Vibra-Tite VC3 is included.
Note for AR style receivers: The Picatinny endcap will cover the hole for the rear takedown detent and spring. For the QD only, an endplate will be needed to cover this hole.
SLS printed in Nylon 12, machined Picatinny rail, 4140 QD cup. Lifetime warranty!