• Post category:Lower Receivers
  • Post last modified:August 1, 2022
  • Reading time:14 mins read

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Best 308 Lower Receiver

Complete 308 Lower Receivers are great bases for custom big-bore AR rifles.The AR lower receiver is the only part of the rifle that is considered a firearm and may be subject to regulation.

Why do we need a 308 Lower Receiver?

The lower receiver is placed above the pistol grip, holding the hammer and trigger, and featuring a slot for the magazine.So the lowers keep the firing mechanism and the magazine.

Best Pick

AERO PRECISION 308 LOWER RECEIVER

AERO PRECISION 308 LOWER RECEIVER

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The M5 Mil-spec Lower Receivers allow customizing 308 AR assemblies with perfect alignment. The bolt catch is threaded for a screw pin, so a roll pin isn’t needed.

Top 11 308 Lower Receiver

#1 LEWIS MACHINE & TOOL 308 LOWER RECEIVER STRIPPED

LEWIS MACHINE & TOOL 308 LOWER RECEIVER STRIPPED

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#2 LEWIS MACHINE & TOOL 308 LOWER RECEIVER COMPLETE

LEWIS MACHINE & TOOL 308 LOWER RECEIVER COMPLETE

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#3 AERO PRECISION 308 LOWER RECEIVER

AERO PRECISION 308 LOWER RECEIVER

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Specification

MAKE: AR .308
CARTRIDGE: 308 WINCHESTER
Style: Stripped

The M5 308 Lower Receiver features top-notch Mil-spec dimensions and coating for proper parts interface. The Lower Receiver integrates trigger guard and selector markings function with 45, 60, or 90-degree safety selectors, the rear takedown pin detent hole is threaded 4-40 for a set screw to retain the takedown pin. The Lower is made from Aluminum (7075-T6) and covered with a Matte Black hard-coat anodized Mil (8625, Type 3, Class 2).

Pros
  • Made in the USA

  • Allows building a custom big-bore AR

  • Fits Gen 1, DPMS 308 pattern components, including magazine and upper receiver

  • No roll pin is needed, as the bolt catch is threaded for a screw pin

  • Accepts both Battle Arms Development short throw safety selectors (100-009-866), and standard safeties

  • All of the roll pins are threaded and included with Aero Precision parts

  • Easy to install

  • Perfect alignment

  • Features 3 screws for a 4-40 rear detent set, bolt catch, and an upper tensioning

  • Accurate milling

  • The Cerakote finish is impeccable

  • The Build goes together flawlessly: M5 FDE lower, Aero parts kit, CMC flat trigger, M5 FDE upper, Aero bolt, carbine buffer tube, and .308 carbine buffer and spring, SLR SOLO Intrepid M-LOK .308 High Profile Handguard, Wilson combat stainless 18-in barrel, SLR Sentry 8 Adjustable Gas Block

Cons
  • Not yet

#4 POLYMER80 308 80% LOWER RECEIVER WITH JIG POLYMER

POLYMER80 308 80% LOWER RECEIVER WITH JIG POLYMER

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#5 CROSS MACHINE TOOL CO.,308 STRIPPED BILLET RECEIVER SET

CROSS MACHINE TOOL CO.,308 STRIPPED BILLET RECEIVER SET

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Specification

Cartridge: 308 Winchester
Style: Stripped

This combination of the lower and upper receiver is great for assembling an AR-style .308 rifle. The Billet Aluminum (7075 T6) Receiver set integrates standard DPMS type .308 lower components, charging handle, bolt carrier group, dust cover, takedown pin, detent spring, and retention screw but it comes without a forward assist. The upper receiver is compatible with DPMS high-profile style .308 handguards. The Ultra flared mag well on the lower is wire EDM cut to accept P-Mags. There are .154-in (3.9mm) diameter triggers and hammer pin holes in the lower.

Pros
  • Uses DPMS pattern components

  • Made in the USA

  • A hex head screw for bolt catch assembly is used instead of a roll pin to make installation easier

  • Fast and simple tightening of the upper to the lower due to the built-in upper tension screw

  • Mil-Spec hard coat anodized finish

  • Well-made matched receiver set: the fit between the upper and lower is secure and tight with minimal movement

Cons
  • Very loose fit top to bottom, takedown pin holes should have been drilled after parts were matched

#6 BROWNELLS STRIPPED LOWER RECEIVER

BROWNELLS STRIPPED LOWER RECEIVER

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Specification

Cartridge: 308 Winchester, 7.62 mm NATO
Style: Stripped

The BRN-7 Stripped Lower Receiver is manufactured from the original HK417, forging out of Germany, featuring a matte black Type III anodizing.

Pros
  • Made in the USA

  • The classic contours of the HK417

  • With Selector markings for the full-auto position

  • Everything fits snugly in the lower

  • The First-class lower

  • Everything is on spec and assembled perfectly

  • There are also mag well adapters to use PMAG/SR20 magazines in it

Cons
  • The HK mags only hold 20 rounds, not 30, as it’s marked

#7 AERO PRECISION CARBINE COMPLETE LOWER RECEIVER

AERO PRECISION CARBINE COMPLETE LOWER RECEIVER

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Specification

Cartridge: 308 Winchester
Style: Kit

The M5 Lower operates well with standard AR 308 parts and mags. The complete Lower Receiver includes a Rear takedown pin detent (with a threaded hole for a 4-40 set screw), integrated trigger guard, Receiver extension, A2 Grip, Lower parts kit, and .308 carbine buffer and spring, but it comes without a stock.

Pros
  • Made in the USA

  • No needed roll pin, as the bolt catch is threaded for a screw pin

  • Selector markings will function with 45, 60, or 90-degree safety selectors

  • Accepts both Battle Arms Development short throw safety selectors and any standard one

  • No gap with aftermarket pistol grips

  • Aero seems to be the standard for an AR-308 build and great for a AR 308 6.5 Creedmoor assembly as well

  • Convenient for newer shooters: it is labeled as a carbine buffer, but it works fine with rifle-length gas systems, and longer barrels

  • Fit, finish, and value are all great

Cons
  • Not yet

#8 JAMES MADISON TACTICAL 308 80% LOWER RECEIVER

JAMES MADISON TACTICAL 308 80% LOWER RECEIVER

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#9 BROWNELLS LOWER RECEIVER

BROWNELLS LOWER RECEIVER

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Specification

Cartridge: 5.56 mm NATO
Style: Billet, Stripped

These BRN-180M Lower Receivers are paired up with the BRN-180 gas piston bufferless upper receivers, but because of the proprietary design they won’t operate with standard AR-15 upper receivers, which need a buffer tube, buffer, spring, and BCG. The lower comes with an integral oversized trigger guard, a threaded bolt catch pin, upper tension screw, a generous Magwell flare, and milled in 1913 Picatinny rail section for stocks’ or braces’ mounting (as the line for the Sig Sauer MCX), but without the traditional receiver extension threads, and an ambidextrous safety selector. This Receiver is constructed from billet 7075 T-6 aluminum with a hard-anodized finish.

Pros
  • Maximizes the full potential of BRN-180 unique line

  • Fully compatible with Mil-Spec lower receiver parts and triggers

  • Included both a threaded bolt catch pin and a captive set screw for the takedown pin detent spring

  • Everything fits perfectly

  • Great threaded pin for the bolt hold-open

  • Well-crafted and a perfect complement to the BRN-180 upper

  • Tough and accepts AR-15 LPKs

  • Feels solid in the hand

  • Installation is a breeze, and takes 10-15 minutes

  • Easy mounting of the bolt release lever because the receiver uses a screw-in pin instead of the typical roll one

  • The 1913 Picatinny rail on the rear allows mounting a super light folding stock or arm brace

  • Great side charging handle

  • Well-made and nicely finished

  • The top-notch machining with good anodizing and pleasing lines

  • The threaded bolt release and take-down spring always help make for an easy assembly/disassembly

  • Nice tight build: it feels solid and no rattles while shaking it

Cons
  • No shortened rear takedown pin detent (or spring) with this receiver

  • An extremely tiny Allen wrench is necessary to install the rear takedown pin (a .050 while every set on the market starts at around 1.5): it should be included since it is a specialty size (the next size up is for a bolt catch installation into the retainer)

  • Since there is no rear buffer plate, installing the take-down pin detent and spring is a little tricky (needs to compress the spring from the bottom and then insert the set screw, trimming the spring down by 3-4 mm makes installing the set screw easier)

  • The lack of instructions for installing the lower parts

  • At the pivot pin area there is a 1/32 to 1/16 gap that does not allow the upper and lower to fit together

  • Tolerances are very sloppy

  • There is a lot of slop in the bolt release

  • Detent springs and pin would not allow the take-down pins to move at all

  • The pistol grip threads aren’t drilled and tapped deep enough to hold the pistol grip in place

  • The injection-molded buffer spring cap on the BRN-180 upper was a bit off dimension and it prevented the rear takedown pin from closing

  • Bad quality control: trigger pins don’t line up, they need drilling out to a bigger size on the lower

  • Standard AR springs are too long on the rear pin

#10 BROWNELLS STRIPPED LOWER RECEIVER

BROWNELLS STRIPPED LOWER RECEIVER

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#11 UTG Pro AR308 Receiver Extension Tube

UTG Pro AR308 Receiver Extension Tube

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Specification

Gun Model: AR 308
Cartridge: .308 Winchester
Overall tube length: 7.9 in

The 6-position Receiver Extension Tube with Mil-spec diameter for .308 AR Rifles features the tightest tolerance control to provide a zero-gap fit with polymer stock and receiver. This UTG Pro-gun component is precision-machined from aircraft-grade Aluminum (6061/T6) with Matte Black Anodizing with Mil-spec, Type III Hardcoat, Class II.

Pros
  • 922R Compliant

  • High-quality

  • Made in the USA

  • No hassle installation

  • Quality awesome finish

  • Sturdy construction

  • Threads fit fine

  • The rifleruns flaw lessly

  • The 7.9-inch tube is a great length as opposed to the standard 7-inch tube

  • Engaged by the butt stock securely

Cons
  • California’s Proposition 65

Conclusion

The lower receiver is one of the most essential components of the custom AR build. Usually, lower receivers are stripped or complete with lower parts integrated and come in a variety of finishes or coatings to enhance sturdiness, crafted from forged or billet aluminum.

Tags: #best 308 lower receiver / #best ar 308 lower receiver / #best 308 stripped lower receiver / #best .308 lower receiver / #best ar lower receiver for 308

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