This Dirty Bird 7.5″ 5.56 M-LOK Pistol Kit w/ SBA4 is everything you need to add to your lower receiver to have a complete rifle.
Dirty Bird 7.5″ Pistol 556 M-LOK Complete Upper
Barrel
- Chambered in 5.56 (will also function with .223)
- 7.5″ Heavy Profile w/ 1:7 Twist
- Mid-Length Gas System
- Black Nitride Finish
- High Pressure Tested, Magnetic Particle Inspected and Test Fired
- Recessed Flash Can
Handguard
- Tough
- Machined from aircraft grade 6061-T6 aluminum extrusions.
- Anti-rotation tabs.
- Versatile
- M-LOK attachment slots on all sides (except top)
- 1913 Picatinny top rail with shaved and beveled center section.
- Raised QD attachment points at the 3 and 9 o’clock positions.
Upper Receiver
- Precision Machined from Top Tier 7075-T6 Aluminum Forgings (forge marks may vary)
- M4 Feedramps
- Laser etched T-marks
NBS Enhanced Mil-Spec Charging Handle
Dirty Bird Industries Enhanced Bolt Carrier Group .223/5.56
- Strategically relocated load bearing surfaces reduce carrier tilt/can’t during recoil, thus increasing reliability and longevity.
- Additional wall thickness in the gas exhaust port area for added strength and rigidity.
The 9310 Bolt is machined to mil-spec dimensions and then the external surfaces including the lugs are CNC ground after the heat treating process to ensure a very precise fit. The bolts themselves feature the same Black Nitride finish as the carrier and are High Pressure (HP) Tested and Magnetic Partical Inspected (MPI) in accordance with Mil-STD-1816 specifications.
SB Tactical SBA4 Pistol Stabilizing Brace
- Designed after the SBM4â„¢
- 5-position adjustable
- Includes 7075 mil-spec carbine receiver extension
- Integral, ambidextrous QD sling socket
- ATF compliant, US veteran designed and proudly made in the USA
- Product includes: Â brace, mil-spec carbine receiver extension, adjustable nylon strap
OEM Mil-Spec AR-15 Lower Parts Kit
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.
