In good condition, put on my rifle but decided to go a different direction, comes with Allen wrench to install as well as screw and all mounting hardware 

New plus tax and shipping they are more than $33, I'd let it go for $27

Designed to considerably improve the speed and efficiency of the AR15/M4 bolt catch, the B.A.D. (Battery Assist Device) Lever quickly addresses reloading and malfunction clearance shortcomings of the platform by extending a paddle to the right side of the weapon, allowing manipulation of the bolt stop from the fire control / ready position with the right-hand trigger finger. Designed around Mil-spec forged upper and lower receivers*, the anodized aluminum B.A.D. Lever attaches to the standard AR15/M4 bolt catch without permanent modification to the weapon. Functional for both left and right-handed shooters, the B.A.D. Lever also allows traditional bolt catch manipulation according to the AR15/M4 manual of arms.

FEATURES

Machined from durable billet 6061-T6 aluminum

Finished with MIL-A-8625F, Type III, Class 2 hard anodizing with manganese phosphate on the screw per MIL-DTL-16232G

Attaches to the existing bolt catch paddle via one screw

Thin, anti-snag profile and textured surface still allows for traditional manipulation of the bolt catch while maintaining unobstructed access to the trigger

Made in the USA.

NOTE: Not compatible with 7.62x51 (.308 Winchester) firearms as well as most AR15 billet or polymer lower and upper receivers due to their larger and/or non-standard dimensions.