The PSA Limited?Edition Forged Lower represents the pinnacle of modern aerospace?grade manufacturing, delivering a Mil?Spec foundation built for uncompromising reliability. Each receiver is produced on a multimillion?dollar automated machining system, ensuring exceptional precision, consistency, and long?term durability. Crafted from rugged 7075?T6 aluminum and finished in a black hard?coat anodizing per MIL?A?8625 Type III Class 2, this lower provides a rock?solid base for virtually any AR?15 build. Marked “CAL. 5.56 MM,” it offers broad compatibility while maintaining the refined fit and finish expected from a premium forged component.

Paired with the PSA lower, the AR57 ULT 12" Complete Upper transforms any AR?15 lower into a unique, high?performance platform chambered in 5.7x28mm. Engineered with a top?loading magazine system and downward ejection through the magwell, the AR57 design delivers exceptional ergonomics and unmatched cleanliness during extended firing. Its monolithic 7075?T6 “Kryptonite Monobloc” receiver—precision?milled to within .002 tolerance—ensures superior strength, rigidity, and heat resistance. Finished in a smooth, ultra?durable melonite coating, the AR57 ULT offers a streamlined profile, lightweight handling, and tank?like durability for shooters seeking a distinctive, high?capacity PDW?style setup.

PSA Limited?Edition Forged Lower Specifications

• Brand: Palmetto State Armory
• Model: Limited?Edition Forged Lower
• Type: AR?15 Lower Receiver
• Material: 7075?T6 Forged Aluminum
• Finish: MIL?A?8625 Type III Class 2 Hard?Coat Anodized
• Markings: “CAL. 5.56 MM”
• Compatibility: Standard AR?15 Components
• Manufacturing: Automated Aerospace?Grade CNC System

AR57 ULT 12" Complete Upper Specifications

• Brand: Panzer Arms
• Model: AR57 ULT
• Product Type: Complete Upper Receiver Assembly
• Caliber: 5.7x28mm
• Barrel Length: 12" Lightweight Steel Barrel
• Overall Length (Upper): ~17" Receiver/Rail Block
• Total Length (Receiver to Muzzle): 24 9/16"
• Receiver Material: 7075?T6 “Kryptonite Monobloc” Aluminum
• Receiver Strength Rating: 83,000 PSI
• Barrel Twist: 1:8.5 FN?Spec, Six?Groove, Right?Hand
• Muzzle Device: Perforated Muzzle Brake, 1/2x28 Threads
• Finish: Melonite?Treated Receiver, Rail, Barrel & Bolt
• Bolt Material: 8620 Alloy
• Rail System:
  • 13?Slot Picatinny Top Rail
  • 3?Slot Upper & Lower Forward Rails
• Operation: Simple Free?Sliding Bolt (No Gas System)
• Ejection: Downward Through Magwell
• Magazine: Includes One 50?Round Magazine
• Compatibility: Fits Standard AR?15 Lowers