The A3 upper receiver assembly is made to mil-spec standards and includes a picatinny rail on the top, dust cover, and installed forward assist.
Pivot/Takedown Pin Size: Small pin - .250"
Material: Forged and mil-spec with type 3 hard coat anodizing and a picatinny rail on top
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Excellent fit on my lower receiver. Excellent quality/price value. Speedy delivery and well packaged. Just waiting on my barrel to complete my 300 Blackout build. I would recommend to a friend without hesitation.
Very nice product. Perfect fit on my lower.