A3 Industries HDA3 Hybrid Polymer Stock - 1913 Picatinny

The A3 Industries HDA3 Hybrid Polymer Stock is a precision-built, folding buttstock engineered to interface directly with most firearms featuring a 1913 Picatinny rail mounting system. The HDA3 offers multi-point adjustability in both length of pull and cheek height while maintaining a rugged construction for sustained use. This stock is optimized for modular rifles requiring compact stowage and rapid deployment. The steel hinge mechanism locks firmly in both extended and folded positions, with the default left-side fold set at a 3.5° downward angle. Internal components are constructed from aluminum and stainless steel to maximize structural reliability, while external surfaces use high-strength, glass fiber-reinforced polymer. Overall length ranges from 7.625" to 10.625", and weight is 18.7 oz. The adapter includes a hardcoat anodized aluminum body with an integrated steel QD sling socket. This stock is manufactured in the United States.

Features:

• Compatible with most 1913 Picatinny rail-equipped platforms
• 7-position length adjustment in 0.5" increments
• 3-position cheek riser: 0, +0.25", +0.50"
• Folding steel hinge with nitride-coated stainless steel internals
• 6061 and 7075 aluminum structural components
• High-strength glass-reinforced polymer exterior
• Dual QD sling sockets (one in adapter, one in stock body)