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Table of Contents
- Why do we need a 308 Lower Receiver?
- Best Pick
- Top 11 308 Lower Receiver
- #1 LEWIS MACHINE & TOOL 308 LOWER RECEIVER STRIPPED
- #2 LEWIS MACHINE & TOOL 308 LOWER RECEIVER COMPLETE
- #3 AERO PRECISION 308 LOWER RECEIVER
- #4 POLYMER80 308 80% LOWER RECEIVER WITH JIG POLYMER
- #5 CROSS MACHINE TOOL CO.,308 STRIPPED BILLET RECEIVER SET
- #6 BROWNELLS STRIPPED LOWER RECEIVER
- #7 AERO PRECISION CARBINE COMPLETE LOWER RECEIVER
- #8 JAMES MADISON TACTICAL 308 80% LOWER RECEIVER
- #9 BROWNELLS LOWER RECEIVER
- #10 BROWNELLS STRIPPED LOWER RECEIVER
- #11 UTG Pro AR308 Receiver Extension Tube
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.
AERO PRECISION 308 LOWER RECEIVER
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
#2 LEWIS MACHINE & TOOL 308 LOWER RECEIVER COMPLETE
#3 AERO PRECISION 308 LOWER RECEIVER
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).
#4 POLYMER80 308 80% LOWER RECEIVER WITH JIG POLYMER
#5 CROSS MACHINE TOOL CO.,308 STRIPPED BILLET RECEIVER SET
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.
#6 BROWNELLS STRIPPED LOWER RECEIVER
The BRN-7 Stripped Lower Receiver is manufactured from the original HK417, forging out of Germany, featuring a matte black Type III anodizing.
#7 AERO PRECISION CARBINE COMPLETE LOWER RECEIVER
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.
#8 JAMES MADISON TACTICAL 308 80% LOWER RECEIVER
#9 BROWNELLS LOWER RECEIVER
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.
#10 BROWNELLS STRIPPED LOWER RECEIVER
#11 UTG Pro AR308 Receiver Extension Tube
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.
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.
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