Dirty Bird MCF-A (Ambidextrous) Lower Receiver

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

• 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.

• Simplicity & Serviceability: 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.