Dirty Bird Industries Multi-Cal Forged Ambidextrous (MCF-A) Lower Receiver
Built for shooters who demand reliability, innovation, and quality, the Dirty Bird MCF-A Lower Receiver stands as a class-leading option for any AR builder.
Precision-Crafted from the Finest Forgings
Our MCF-A lowers are meticulously machined from top-tier 7075 Aluminum forgings.
Manufactured by VKTR Industries: Innovation Meets Attention to Detail
Dirty Bird has partnered with VKTR Industries, renowned for their engineering excellence and commitment to premium quality. VKTR’s dedication to advanced machining and tight tolerances ensures each MCF-A lower meets the highest standards and delivers outstanding performance you can trust.
Enhanced Practical Features
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Ambidextrous Bolt Catch/Release: The MCF-A’s innovative mechanism provides seamless ambidextrous operation—release or lock the bolt back with ease from either side of the receiver. Designed for durability, the system functions independently of the standard bolt catch in case of damage or debris.
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Simplicity & Serviceability:Â With only 4 proprietary components (all crafted from Billet S7 Tool Steel and QPQ Nitrided for unbeatable strength), there are zero hex screws. The ambi bolt catch lever uses a standard bolt-catch roll pin for straightforward maintenance and high reliability.
Made in the USA & Lifetime Warranty
Proudly manufactured in the USA, the MCF-A Lower Receiver is protected by Dirty Bird’s Limited Lifetime Warranty, ensuring your investment is backed by our commitment to quality.
Dirty Bird Industries — Premium AR-15 and AR-10 Components, Built to Last.
Designed for builders who demand uncompromising quality, reliable performance, and accessible pricing without the premium markups common from larger brands.
Founded by Builders, Built to Last
Founded in 2015 by brothers Jay and Dustin Pitcher in a Bakersfield, California garage, Dirty Bird Industries started as a family-owned operation specializing in custom Cerakote finishes and high-quality AR parts. Building on experience from its sister site, AR15Discounts.com, Dirty Bird Industries has grown into a nationwide company with a dedicated team focused on American-made gear that shooters trust.
American-Made Quality and Precision
Through strategic partnerships with leading domestic manufacturers, Dirty Bird Industries sources and develops components using advanced CNC machining, rigorous testing, and mil-spec standards. By managing larger volumes, the company delivers proven, high-end materials and precision engineering at fair prices that meet the high standards set for its own builds.
Proven Components for Serious Builds
Standout offerings include precision-forged 7075-T6 upper and lower receivers, enhanced black nitride bolt carrier groups, single-stage nickel Teflon triggers, free-float M-LOK handguards, complete upper assemblies, and comprehensive lower parts kits. These products create a cohesive selection for everything from custom builds to high-performance rifles nationwide, supported by batch inspections, mil-spec compliance, and ongoing innovations.
Zero Risk Guarantee Program
For total confidence, Dirty Bird Industries backs eligible parts and accessories with its Zero Risk Guarantee Program. This includes free shipping on orders over $50, package protection up to $5,000, lifetime free returns with full refunds within 45 days or store credit after, and expert support. As passionate shooters, the team at Dirty Bird Industries stands behind every product because the company builds, tests, and uses them too, providing authentic value and dependable gear.





