Receiver PartsAero PrecisionSold by Brownells

Aero Precision

Ar .308 M5 Lower Complete W/ A2 Grip & M4 Stock - M5 Comp Lower Receiver W/A2 Grip M4 Stock For Ar .308 Black

Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.

Aero Precision

M5 .308 complete lower receiver

Works Standard

Standard AR .308 components and

Rear Takedown

Pin detent hole is threaded

Bolt Catch

Uses a threaded screw pin,

Integrated Trigger

Guard is included

$340.00
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SKU: 100054443

Overview

Built as a complete lower for a custom .308 AR platform, this Aero Precision setup gives hunters a ready starting point for a big-bore rifle build. It works with standard AR 308 components and magazines, and includes an integrated trigger guard, mil-spec lower parts kit, M4 stock, and A2 grip. The threaded rear takedown pin detent hole and screw-pin bolt catch are practical details that simplify assembly. For shooters planning a hunting rifle around familiar AR controls and a standard carbine setup, it offers a straightforward foundation without unnecessary extras.

Why Hunters Choose the Aero Precision

Works Standard

Standard AR .308 components and

Complete Lower

Receiver includes mil-spec lower parts

Integrated Trigger

Guard is built into the

Threaded Rear

Takedown pin detent hole supports

Bolt Catch

Uses a threaded screw pin,

Key Features

  • Aero Precision M5 .308 complete lower receiver for a custom big-bore AR rifle.
  • Works with standard AR .308 components and magazines.
  • Rear takedown pin detent hole is threaded for a 4-40 set screw.
  • Bolt catch uses a threaded screw pin, eliminating the need for a roll pin.
  • Integrated trigger guard is included.
  • Selector markings work with 45, 60, or 90 degree safety selectors.
  • Includes an M4 stock, A2 grip, and mil-spec lower parts kit.

Best Used For

  • Builders assembling a custom .308 AR around standard AR 308 components and magazines.
  • Hunters wanting a complete lower receiver with stock, grip, and lower parts kit included.
  • Users planning a big-bore rifle setup compatible with standard or short-throw safety selectors.
  • Shooters who prefer an integrated trigger guard and a clean fit with aftermarket pistol grips.

Specifications

A2 GripBlack
Accepts Battle Arms Development Short Throw Safety SelectorsYes
Bolt Catch Threaded For Screw Pin No Roll Pin NeededYes
Carbine Receiver ExtensionIncluded
Integrated Trigger GuardYes
M4 StockBlack
M5 Lower ReceiverAnodized Black
Mil Spec Lower Parts KitIncluded
No Gap With Aftermarket Pistol GripsYes
Rear Takedown Pin Detent Hole Threaded For 4 40 Set ScrewYes
Selector Markings Compatible With 45 60 Or 90 Degree Safety SelectorsYes
Works With Any Standard SelectorYes
Works With Standard Ar 308 Components And MagazinesYes

Pros

  • Works with standard AR .308 components and magazines for broad compatibility.
  • Complete lower receiver includes mil-spec lower parts kit, M4 stock, and A2 grip.
  • Integrated trigger guard is built into the M5 lower receiver.
  • Threaded rear takedown pin detent hole supports a 4-40 set screw.
  • Bolt catch uses a threaded screw pin, eliminating the need for a roll pin.
  • Selector markings support 45, 60, or 90 degree safety selectors.

Considerations & Trade-offs

  • This complete lower is built around standard AR .308 components and magazines, so compatibility should be checked against the rest of the rifle build before purchase.
  • The included M4 stock and A2 grip are fixed in the package, which may not suit users planning to customize those parts immediately.
  • Selector markings are described as working with 45, 60, or 90 degree safety selectors, but the lower is still intended to work with standard selectors as well, so selector choice should be confirmed during setup.
  • The product is a complete lower receiver assembly, which adds convenience but also means you are buying the included lower parts kit and furniture as configured rather than piece by piece.

Suggested Comparisons

  • AR-10 / .308 lower receivers
  • Complete lower receiver assemblies
  • AR-308 lower parts kits

Suggested Accessories

  • AR-308 upper receiver
  • AR-308 magazine
  • Mil-spec buffer tube assembly
  • AR-308 lower parts kit

Frequently Asked Questions

What components are included with this complete lower receiver?

The product description lists an M5 lower receiver in anodized black, an M4 stock in black, an A2 grip in black, a mil-spec lower parts kit, and a carbine receiver extension.

Is this lower receiver compatible with standard AR .308 parts and magazines?

Yes. The source states that it works with standard AR 308 components and magazines.

What safety selector options does this lower support?

The selector markings are stated to work with 45, 60, or 90 degree safety selectors. It also accepts Battle Arms Development short throw safety selectors and will work with any standard selector.

Does this lower require a roll pin for the bolt catch?

No. The bolt catch is threaded for a screw pin, so a roll pin is not needed.

Are there any fitment notes for aftermarket pistol grips?

Yes. The description says there is no gap with aftermarket pistol grips.