MasterPiece Arms 5770 MPA 20rd 5.7x28mm Magazine Black Polymer

The MasterPiece Arms 5770 MPA magazine delivers reliable feeding for 5.7x28mm ammunition in MPA Defender pistols. This factory magazine ensures consistent performance with its precision-engineered polymer construction and anti-tilt follower system.

What Makes This Different

Factory MPA magazines feature reinforced polymer construction that withstands repeated loading cycles better than aftermarket alternatives. The magazine body incorporates steel reinforcement inserts at critical stress points, extending service life beyond standard polymer designs. MPA's proprietary follower geometry reduces double-feeds and failure-to-feed malfunctions common with generic magazines.

Key Features

• 20-round capacity for 5.7x28mm ammunition
• Black polymer construction with steel reinforcement inserts
• Anti-tilt follower prevents feeding malfunctions
• Compatible with MasterPiece Arms Defender pistols
• Witness holes for round count verification
• Removable floorplate for maintenance access
• Factory specification spring tension

This magazine maintains consistent feeding pressure through its full capacity range. The polymer body resists impact damage while remaining lightweight for extended carry. Competition shooters appreciate the reliable feeding characteristics during rapid-fire strings, while the witness holes allow quick ammunition counts during tactical reloads.

Technical Specs

• Capacity: 20 rounds of 5.7x28mm ammunition
• Construction: Reinforced black polymer body
• Compatibility: MasterPiece Arms Defender pistols
• Follower: Anti-tilt design with steel spring
• Overall Length: Approximately 6.5 inches
• Weight: 3.2 ounces empty
• Country of Origin: United States

Factory magazines provide the reliability advantage of matching the pistol's original specifications exactly. MPA engineers these magazines to work seamlessly with the Defender's feeding system, eliminating the compatibility issues often encountered with third-party alternatives.