Tempered steel spring has correct tension for proper cycling of AR-style rifles chambered in .308/7.62mm. Use as a replacement for a fatigued factory spring or in a new-build custom rifle.
SPECS:
Tempered spring steel. .950" (2.4cm) diameter. Carbine – 11" (27.9cm) long. Fits collapsible stock carbine receiver extension. Rifle – 12½" (31.8cm) long. Fits fixed A2-style receiver extension.
Catalog page 25