The TLT-TKSBC Enhanced UTG® AR-15 Oversized Bolt Catch Release Lever is the perfect accessory to add to your AR-15/M4 rifles. The enhanced serrated oversized bolt release-extended catch give you faster and easier reach and manipulation. The AR-15 Oversized Bolt Catch is made of solid steel construction and finished in matte black. It includes a roll pin, detent, and bolt catch spring.