M5 Complete Lower Receiver with MOE and STR Black

Product Description

The Aero Precision M5 complete lower receiver with MOE and STR in black is a serialized .308-platform lower assembly built for large-frame AR-style rifles. This complete lower arrives assembled with furniture installed, so you can mate it with a compatible upper receiver and move directly to function-checking and zeroing.

The M5 platform is Aero Precision’s large-frame series, designed around the .308 Winchester and 6.5 Creedmoor cartridge families. A complete lower like this one eliminates the need to source and install individual fire-control parts, buffer assemblies, and furniture separately.

Key Facts

• Brand: Aero Precision
• Model: M5 Complete Lower Receiver with MOE and STR
• SKU: APAR308017
• Finish: Black
• Category: Serialized complete lower receiver

What the M5 Lower Receiver Fits

The M5 lower receiver is built to the DPMS-pattern .308 specification, which is the most common large-frame AR standard. It accepts DPMS-compatible upper receivers, meaning you can pair it with a wide range of .308 and 6.5 Creedmoor uppers from Aero Precision and other manufacturers that follow the same dimensional standard.

The M5 will not accept AR-15 (small-frame) upper receivers. The magazine well, pivot and takedown pin spacing, and buffer tube threads are all sized for the larger .308 cartridge family. If you’re building a 5.56 or .223 rifle, you need an AR-15 lower instead; browse our complete lowers to compare options.

Complete vs. Stripped M5 Receivers

A complete lower arrives with the fire-control group, buffer system, and furniture already installed. A stripped lower is the serialized forging or billet only; you source and install every internal component yourself.

Complete lowers save time and eliminate the need for specialized punches, vise blocks, and staking tools. Stripped lowers offer full control over trigger choice, buffer weight, and stock style, but require more tools and experience. For builders who want to start shooting sooner or who prefer known-good fire-control components, a complete lower removes variables.

You can find both configurations in our lower receivers category.

FFL Transfer Process in Texas

Lower receivers are serialized firearms under federal law. When you order this M5 lower, it ships to Western Sport, and we contact you when it arrives. Bring a current Texas driver’s license or LTC if you’re a Texas resident, or your state-issued ID and proof of residency if you’ve recently moved.

The transfer process typically takes fifteen to twenty minutes once paperwork begins. If you have questions about eligibility or documentation, send us a message before placing your order.

Ordering from Western Sport

Order online and we ship it to the licensed FFL dealer you choose near you — see how buying a gun online works. Western Sport has been a licensed FFL/SOT dealer since 2007, and everything we sell carries the full manufacturer warranty. Questions before you order? Send us a message.

Frequently Asked Questions

Q: Will the M5 lower receiver work with AR-15 uppers?

A: No, the M5 lower receiver is dimensioned for DPMS-pattern .308 uppers and will not mate with AR-15 (small-frame) uppers. The pivot and takedown pin holes, magazine well, and buffer tube threads are all sized for the larger .308 cartridge family, making the two platforms incompatible.

Q: Is the M5 receiver the same as the M5E1?

A: The M5 and M5E1 are distinct product lines within Aero Precision’s large-frame family. The M5E1 features a threaded bolt catch pin and an integrated trigger guard, while the standard M5 uses a roll pin and a removable trigger guard. Both follow DPMS .308 dimensions for upper receiver compatibility.

Q: What does “complete lower” mean for the M5?

A: A complete lower arrives fully assembled with the fire-control group, safety selector, magazine release, bolt catch, buffer tube, buffer, action spring, and furniture installed. You do not need to source or install internal parts. To complete the rifle, you add a compatible M5 or DPMS-pattern upper receiver and verify function.

Q: Does Aero Precision offer a warranty on the M5 lower?

A: Send us a message to confirm current warranty terms for this lower receiver. Warranty policies vary by manufacturer and can change, so we recommend verifying coverage details before your purchase if warranty length is a deciding factor.

Q: What is the black finish on this M5 lower receiver?

A: The product name specifies a black finish, but the specific coating or anodizing type is not listed.

Additional information