• Post category:AR-15 Parts / Lower Receivers
  • Post last modified:July 18, 2022
  • Reading time:18 mins read

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Best AR 15 Lower Receiver

The precision lower receiver is a foundation of any quality AR-15 rifle to ensure firearm optimization. Various manufacturers of Lower Parts Kits (LPKs) provide different fitting: some can be easier to put together than others.

Why do we need an AR 15 Lower Receiver?

Lower Receiver Parts allow customized AR-15 builds for the best and most convenient shooting experience. Many lower receivers feature duly machined mil-spec components.

Best Pick

SONS OF LIBERTY GUN WORKS LOWER RECEIVER

SONS OF LIBERTY GUN WORKS LOWER RECEIVER

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These Assembled AR-15 ‘Semi-Complete’ Lower Receivers don’t come with the stock and trigger to allow shooters to choose according to their preferences.

The Lowers are designed for a 5.56 mm NATO Cartridge. They have a fully-machined contour that doesn’t leave flash marks from the forging. The tight tolerances ensure better fitting than other lowers.

Top 14 Best Lower Receiver AR 15

#1 WILSON COMBAT LOWER RECEIVER BILLET

WILSON COMBAT LOWER RECEIVER BILLET

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#2 WILSON COMBAT LOWER RECEIVER FORGED

WILSON COMBAT LOWER RECEIVER FORGED

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Specification

Make: AR-15
Cartridge: 5.56 mm NATO
Style: Forged, Stripped

The forged lower receivers with Black Finish can be used to build out an M16A1 parts kit.

Pros
  • Made in the USA

  • Excellent fit and finish

  • Very tight tolerances

  • Carefully machined

  • Fit on the PWS upper perfectly

Cons
  • Magwell is out of spec and will have to be opened up for proper function

  • Without a mag catch installed, you have to use force to insert and extract gen 2/3 mags and GI magazines

#3 17 DESIGN AND MANUFACTURING BILLET LOWER RECEIVER

17 DESIGN AND MANUFACTURING BILLET LOWER RECEIVER

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Specification

Make: AR-15
Style: Stripped
Cartridge: Multi

The Stripped billet Lower Receiver is machined to mil-spec dimensions and operates well with standard AR15 parts. The Upper tensioning screw ensures fine-tune. Wider angles of flared mag well angles give a more flared feel without increasing the width/footprint of the lower receiver.

Pros
  • Highest quality

  • Delivers components interchangeability

  • Made in the USA

  • The tensioning and bolt catch screws are included

  • A breeze to assemble for a .223 Wylde rifle and a 7.62×39 pistol area

  • Looks and fits great

  • Everything functions as it should

  • All holes are snug-fitting, but not so much as to interfere with pin/shaft installations

  • Everything installed exactly as expected

  • C-Products, S/S Duramags, Black Dog .223/22LR conversion mags fit snugly into the mag well, if inserted with moderate force

  • Good price

  • Easy install of all components (Aero Precision and Geissele trigger): convenient features such as the built-in trigger guard, threaded bolt catch pin, bolt release set screw, and tensioning screw

  • No sharp edges

  • Magpul magazines drop free

  • The lower parts kit installs easily and flawlessly

  • The tight fit of upper and low without wobbling

Cons
  • The finish comes off easily on sharp edges

  • The pistol grip hole is not beveled

  • The nylon set screw isn’t included with the receiver

  • The hole for the spring and detent that holds the front pivot pin was not drilled to the proper depth

  • The magazine well tolerance is so tight that Magpul and Okay Industry mags require a lot of force to insert and also require force to pull them out of the receiver

  • Have to modify the spring to make it work

  • Sharp edges on the receiver bottom and the trigger guard top

  • Out of spec BCG: rubbed the Buffer Tube when the charging handle is pulled

  • The magazine release and bolt catch don’t work properly: as the bolt catch sits on certain magazine lips, this won’t let it freely drop

#4 SILENCERCO BILLET LOWER RECEIVER

SILENCERCO BILLET LOWER RECEIVER

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Specification

Cartridge: 5.56 mm NATO, 5.56 mm NATO
Weight: .900 LBS
Style: Assembled

The receiver features Sling Cups at the rear, inner ambidextrous anti-rotation QD, 45 to 90-degree fire selector window for short-throw fire selectors. The lower comes with the mounting pin, spring, detent for the Ambi bolt release, and Rear tension bolt hole (but the bolt isn’t included). The AR-15 Billet Receiver is manufactured from Aluminum (7075) with a Type 3 Hard Coat Anodized finish.

Pros
  • Proprietary ambidextrous bolt catch

  • Fully machined from Billet

  • Enlarged integral trigger guard

  • The functional flared magazine well

  • Made in the USA

  • Superb Fit and finish

  • The bolt release and overall look are awesome

Cons
  • The rear takedown pin spring hole isn’t tapped, nor has an insert for it (there is a threaded hole for a tightening pin for the upper)

#5 SONS OF LIBERTY GUN WORKS LOWER RECEIVER

SONS OF LIBERTY GUN WORKS LOWER RECEIVER

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Specification

Cartridge: 5.56 mm NATO
Style: Assembled

The AR-15 ‘Semi-Complete’ Lower Receivers don’t include the stock and trigger, as these parts are the most replaceable ones according to the shooters’ preferences. The Lowers are available with either the Rebellious Stripes or Angry Patriot roll marks, completed with Take Down Pins, Carbine Buffer Tube Assembly, B5 P23 Grip, Installed Bolt, and Magazine Releases. The Angry Patriot comes without a safety selector or FCG.

Pros
  • Rugged and reliable

  • Forged in the U.S. from mil-spec 7075-T6 forgings

  • The fully-machined contour leaves no flash marks from the forging

  • Tight tolerances deliver better fitting than other lowers

  • No wobble with SOLGW stripped upper

  • Matte black hard-coat anodized Mil 8625 Type 3 Class 2 finish

  • High-level fit and finish for an AR part

  • Semi-gloss and durable Anodizing

  • Perfectly match up with a Geissele SSA trigger and SOLGW 13.7 upper

Cons
  • Not yet

#6 V SEVEN WEAPON SYSTEMS LOWER RECEIVER LITHIUM ALUMINUM

V SEVEN WEAPON SYSTEMS LOWER RECEIVER LITHIUM ALUMINUM

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#7 ANDERSON MANUFACTURING 80% LOWER RECEIVER

ANDERSON MANUFACTURING 80% LOWER RECEIVER

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#8 V SEVEN WEAPON LOWER RECEIVER ENLIGHTENED ALUMINUM

V SEVEN WEAPON LOWER RECEIVER ENLIGHTENED ALUMINUM

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#9 STAG ARMS STRIPPED LOWER RECEIVER

STAG ARMS STRIPPED LOWER RECEIVER

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Specification

Cartridge: 5.56 mm NATO
Weight: about .55 lb or 9.6 oz
Style: Stripped
Hammer/Trigger pin size: Mil-spec small pin .154 in
Pivot/Takedown Pin Size: Mil-spec small pin .250 in

The multi-caliber Ambi standard Lower Receiver is stamped for the state of CT.

It fits a BCM upper receiver. The Lower is constructed from Aluminum (7075 T6) with a Type 3 Hard Coat Black Anodized finish. The receiver is equipped with a drilled front trigger guard pinhole, a spring-loaded detent that fits in a hole on one side only. The rear is the only end that uses an actual pin that goes all the way through.

Pros
  • Made in the USA

  • Fairly inexpensive lower

  • Effortless building as everything is in the spec

  • Not only left-handed lower but it can also be used for any lower receiver build

  • An unexpected bonus is a tension screw, which isn’t indicated in the description

  • Nice finish but with a decent amount of mars underneath

Cons
  • Not yet

#10 SPIKES TACTICAL STRIPPED LOWER RECEIVER

SPIKES TACTICAL STRIPPED LOWER RECEIVER

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#11 CMC Triggers Complete Lower Receiver Parts Kit

CMC Triggers Complete Lower Receiver Parts Kit

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Specification

Gun Model: AR-15
Gun Type: Rifle

The Mil-Spec AR15 Lower Parts kit consists of Bolt Catch with Plunger and Spring, Buffer Retainer with Spring, Mag Release with Button and Spring, Roll Pin, Safety, Safety Detent with Spring, Take, Trigger Guard with Roll Pin. The Fire control group and grip are not included.

Pros
  • A perfect complement to the trigger group

  • All components meet or exceed MIL-SPEC

  • Crafted from solid high-quality steel for improved performance

  • Quality parts to match the CMC Lantac drop-in trigger

  • Awesome price

  • The drop-in trigger is easy to install, no hammering is needed

  • After installing the kit the mag release and bolt catch work perfectly

Cons
  • California’s Proposition 65

  • Oversized roll pins

  • Out of spec safety, detents, springs, and bolt catch

  • The trigger guard looks almost like polymer

  • The finish is unacceptable: the mag release assembly is almost rusty

  • The takedowns pins are stiffer than they should be – hard to use

  • The fit is loose

  • Have to purchase separate items, not a complete kit

  • Magazine catch does not fit

  • Bolt catch pin is too thick

  • Safety is hard to operate

#12 CMMG, Inc AR-15 Lower Reciever Parts Kit

CMMG, Inc AR-15 Lower Reciever Parts Kit

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Specification

Cartridge: Universal
Gun Model: AR-15
Gun Type: Rifle
Trigger Pin Size: Standard

There is the same completeness of 2 models: 2x Hammer and Trigger Pin, 2x Takedown Pin Detent with Springs, Bolt Catch with Plunger, Spring, and its Pin, Buffer Retainer with Spring, Magazine Catch with Spring, Magazine Release Button, Receiver Pivot Pin, Selector Detent, Takedown Pin. Additionally to these main parts, one model has a Safety selector, the second one – Ambidextrous Selector, Disconnect with Spring, Hammer with Spring, Lock Washer, Pistol Grip, and Screw, Trigger with Spring, Trigger Guard Assembly, and Trigger Guard Pivot Spring Pin.

The third model comes with such accessories: A2 Grip, Bolt Catch with its Plunger, its Roll Pin and its Spring, Buffer Retainer Pin with Spring, Detent Spring, Disconnector with Spring, Grips Screw & Washer, Hammer with Spring, Magazine Catch with Spring, Magazine Release Button, Pivot Pin, Rear Takedown Pin, Safety selector with Detent, Selector Spring, Takedown Pin Detent, Trigger with Spring, and Trigger Guard. These kits don’t include a trigger guard, fire control group, and pistol grip.

Pros
  • Meets mil-spec standards

  • Compatible with rifle buttstock kits

  • Comes with most of the necessary components, except the commonly upgraded ones, to build up a lower group

  • Smooth action

  • On an Anderson lower it goes together like clockwork

  • The bolt release roll-pin goes in flawlessly

  • Some of the components need a bit of fitting but operate well

  • Easy to assemble and follow instructions

  • Reasonable price

  • The takedown pins function properly

  • Tight reliable fit

  • The bubble pack with parts labels to help newbies

  • The trigger feels less gritty

Cons
  • Missing parts: the hammer spring, disconnect spring, and pivot pin- undue Quality Control

  • Right tolerances

  • Polymer MAG release button

  • Very weak compared to other springs

  • Very basic, not ergo grip

  • The selector is also very loose and sticks out away from the receiver

#13 Aero Precision AR-15 Lower Parts Kit

Aero Precision AR-15 Lower Parts Kit

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Specification

Gun Model: AR-15

The Mil-spec Lower Parts Kit is outfitted with a versatile Magpul MOE Grip and Magpul MOE Trigger Guard, allowing it to assemble an AR15 Gen 2 build. The kit consists of takedown and Pivot Pin, Detent, and Spring, Bolt Catch with Buffer, Roll Pin, Spring, Magazine Catch Body with Button and Spring, Buffer Retainer with Spring, Safety Selector with Spring and Detent, 4-40 Set Screw (for threaded takedown pin detent hole), Hammer with Spring, Trigger with Spring, Trigger/Hammer Pins, Disconnector with Spring.

Pros
  • Available with MOE and MOE SL Grip and Trigger Guard Options in Anodized Black and FDE

  • Well-Functional

  • Part is in the spec: fits nicely and tight with other mil-spec components

  • Stylish design

  • Feels sturdy

  • Noticeable quality

  • The finish on parts is perfect

  • Affordable

  • Nice-feeling trigger break

  • The Magpul grip is an awesome plus: it leaps and bounds better than the A2 grip

  • Comes with the set screw needed to lock in the safety selector spring/detent

Cons
  • Lack of Direction for novices

  • The trigger guard doesn’t line up to the holes in the American Tactical Lower, and the grub screw, holding the guard front, strip out

  • The trigger resets only when it’s switched into safe after the hammer reset

#14 Aero Precision AR-15 Magpul MOE SL Lower Parts Kit

Aero Precision AR-15 Magpul MOE SL Lower Parts Kit

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Specification

Gun Model: AR-15

This Mil-spec Lower Receiver kit comes without a fire control group. The Lower Parts Kit is equipped with a Magpul MOE Trigger Guard, a versatile Magpul MOE Grip (both available in Anodized Black or FDE), Pins, Detents, and Springs for Takedown and Pivot, Bolt Catch with Roll Pin, Buffer, Spring, Buffer Retainer with Spring, Magazine Catch Body with Button and Spring, 4-40 Set Screw (for threaded takedown pin detent hole), Safety Selector with Spring and Detent. Multiple components in the kit are not cross-compatible with .308-AR lower.

Pros
  • Great for an AR15 Gen 2 assemblies

  • Can be paired with a Palmetto polished trigger kit

  • Good quality

  • Fits perfectly

  • Works like a dream

Cons
  • Poorly finished parts: Slight pitting and rust on take-down pins

Conclusion

While choosing AR Lower Receivers, check the quality of finish, completeness (what is included or not), reviews about missing parts (rare cases or frequent ones), and compatibility with AR builds. Usually, detents and springs are quite the same, while magazine releases and safety selectors can vary a bit.

Tags: #best ar 15 lower receiver / #best lower receiver ar 15 / #best ar 15 lower receiver for the money / #best lower receiver for ar 15 / #best ar-15 lower receiver

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