Masterpiece Arms (MPA) is a firearms manufacturer known for producing their components in-house, a rare trait in the industry, which allows them to maintain tight control over quality and design. Among their notable products is the Defender series, a semi-automatic pistol line inspired by the Ingram MAC submachine gun from the 1960s. The Defender series has been updated with modern features, including a more ergonomic and comfortable grip, a machined aluminum lower receiver, and a top-cocking charging handle. Some models in this series are compatible with various magazine types, including those designed for Glock, which enhances their versatility and appeal. All MPA firearms, including the Defender series, require purchase through a licensed FFL (Federal Firearms License) dealer, ensuring compliance with legal regulations. The 9mm variant of the Defender series, based on the 30sst model, features a fully machined aluminum pistol grip designed to accept Glock magazines, specifically the 17 and 33-round versions. This grip is ergonomically designed with a low-profile magazine release and “Decal Grip” panels for enhanced comfort and control. Additionally, the pistol comes equipped with adjustable front and rear sights and a durable Cerakote Black finish. MPA also offers a 5.7x28mm variant, the 57DMG, which boasts a fully machined aluminum lower receiver and grips, further reducing weight and improving ergonomics compared to previous models like the MPA57SST. The 57DMG is fully compatible with FN57 magazines, available in both 20 and 30-round capacities, making it a versatile and modern option for enthusiasts of this unique caliber.