This is a TROY Magazine Release known as the Ambidextrous, model SREL-AMB-00BT-00.
The Ambidextrous Magazine Release replicates the feel and length of a standard magazine release button but also accommodates left-handed shooters and one-handed magazine changes. This magazine release is constructed of rugged machined billet tool steel. Patent pending. Available in Black.
Features:
Billet Tool Steel
Ambidextrous
Magazine Release