Luth-AR A2 Rear Base Elevation Knob Spring Silver

Luth-AR A2 Rear Base Elevation Knob Spring Silver. Specifications for Luth-AR A2 Rear Base Elevation Knob Spring: Manufacturer: Luth-AR Gun Make: AR Platform Gun Model: AR-15 Sight Position: Rear Front Sight Color: REAR SIGHT ONLY Country of Origin: USA Gun Type: Rifle Color: Silver Package Contents: Luth-AR A2 Rear Base Elevation Knob Spring What firearm models does the manufacturer say Luth-AR A2 Rear Base Elevation Knob Spring is compatible with? The manufacturer says that Luth-AR A2 Rear Base Elevation Knob Spring is compatible with AR-15Luth-AR UR-31: A2 Rear Base Elevation Knob Spring Silver