Ar-15 M4 Complete Lower Receiver 5.56mm Colt

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Looking to build your next AR-15 rifle? The Colt AR-15 M4 Complete Lower Receiver provides AR builders with the perfect foundation upon ... Looking to build your next AR-15 rifle? The Colt AR-15 M4 Complete Lower Receiver provides AR builders with the perfect foundation upon ...

Ar-15 M4 Complete Lower Receiver 5.56mm Colt.

The Perfect Foundation for the Rifle of Your Dreams

Looking to build your next AR-15 rifle? The Colt AR-15 M4 Complete Lower Receiver provides AR builders with the perfect foundation upon which to construct the rifle of their dreams.

The Colt AR-15 M4 Complete Lower Receiver is made entirely from 7075-T6 aluminum and features a black hardcoat-anodized finish for added durability.

  • Marked for 5.56 NATO
  • •single-stage semi-automatic trigger group
  • Equipped with M4-style buttstock and pistol grip

The Colt AR-15 M4 Complete Lower Receiver is built using the same parts and the same attention to detail as the company's popular line of LE6920 AR-15 rifles.

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Sometimes you want the latest, updated, tweaked component, and sometimes you need a basic stripped receiver where the production effort goes into ... Sometimes you want the latest, updated, tweaked component, and sometimes you need a basic stripped receiver where the production effort goes into ...

Ar-15 M4 Stripped Upper Receiver Black Brownells.

A Solid Foundation for Your Next Custom Build

Sometimes you want the latest, updated, tweaked component, and sometimes you need a basic stripped receiver where the production effort goes into quality, rather than bells and whistles. The Brownells M4 Stripped Upper Receiver is that component - the perfect starting point for many an AR-15 build.

Starting with a 7075 T6 aluminum forging, our stripped M4 flattop upper is precision machined to final dimensions that make it compatible with the multitude of available "mil-spec" AR-15 components. It has a matte black, Type III hardcoat anodized finish, mirroring the military requirement.

  • Machined from 7075-T6 aluminum forging
  • Matte black Type III hardcoat anodized finish
  • Mil-spec dimensions for maximum parts compatibility
  • Standard .250" dia. pivot/takedown pin holes
  • T-marked Picatinny top rail

Inside our upper features M4 feed ramps to aid in chambering during high rates of fire. And outside the T-marks in the Picatinny rail’s slots are painted to aid in fast exchanges of optics.

Please note: this is a truly stripped upper receiver, with NO forward assist or ejection port cover installed, so you can truly customize every aspect of your rifle. The Brownells M4 Stripped Upper Receiver is a top-tier upper receiver, at a great price.


Big Book Catalog, Issue:71, Page:002

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The SB Tactical SBA3 Pistol Stabilizing Brace adds 5 positions of adjustments for the perfect fit as well as offering all of ... The SB Tactical SBA3 Pistol Stabilizing Brace adds 5 positions of adjustments for the perfect fit as well as offering all of ...

Sba3 Pistol Stabilizing Brace 5-Position Adjustable Sb Tactical.

5 Positions for Maximum Versatility

The SB Tactical SBA3 Pistol Stabilizing Brace adds 5 positions of adjustments for the perfect fit as well as offering all of the benefits of a pistol arm brace.

The minimalist design features compatibility with a standard mil-spec carbine receiver extension, an ambidextrous QD socket, and an adjustable nylon strap.

  • 5-position pistol stabilizing brace
  • Includes Mil-Spec carbine extension
  • Fits: Mil-Spec AR15 receivers
  • Weight: 6.75 oz.
  • 6.1” long and 1.8” wide

Available in both black and flat dark earth, the SB Tactical SBA3 Pistol Stabilizing Brace is a great addition to your next AR pistol build.

Does not include the lock nut or end plate. Those will need to be purchased separately.


Big Book Catalog, Issue:71, Page:050

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The Matrix Arms 80% Forged AR-15 Lower Receiver takes the DIY AR build to the next level for the dedicated AR owner, ... The Matrix Arms 80% Forged AR-15 Lower Receiver takes the DIY AR build to the next level for the dedicated AR owner, ...

Ar-15 80% Lower Receiver Forged Matrix Arms.

An AR Lower Shipped Straight to Your Front Door

The Matrix Arms 80% Forged AR-15 Lower Receiver takes the DIY AR build to the next level for the dedicated AR owner, giving them the chance to machine out the interior pocket themselves for the ultimate AR project.

The Matrix Arms 80% Forged AR-15 Lower Receiver includes all of the exterior machining done for you and only needs the interior pocket for the hammer and trigger machined in order to make it a fully functioning lower.

  • Constructed from 7075-T6 aluminum
  • Can be had in unfinished or black anodized finishes
  • Does not have to be shipped to an FFL dealer
  • Stamped with S & F on both sides

The Matrix Arms 80% Forged AR-15 Lower Receiver also features a take-down lug pocket and is a great way to take on an advanced AR build.

Returns will not be accepted once the receiver is modified in any way. All warranty issues will be directed to the manufacturer.


Big Book Catalog, Issue:71, Page:008

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A battle rifle is only as reliable as its magazine – make sure the one in your rifle is from Brownells. When ... A battle rifle is only as reliable as its magazine – make sure the one in your rifle is from Brownells. When ...

Ar-15 30rd Magazine Cs 223/5.56 Brownells.

The Most Up-To-Date & Reliable Civilian Magazine Available

A battle rifle is only as reliable as its magazine – make sure the one in your rifle is from Brownells. When the difference between a “bang” and a “click” is life and death, a magazine failure is more than inconvenient – it can be fatal. So when we decided to build our own AR-15/M16 magazines, reliability was our first priority. Some of us have sons and daughters serving overseas or in law enforcement, and we aimed to build the kind of magazine we’d trust their lives with. We started with a clean slate, then worked out the bugs on the drawing board and the test range before we offered a single mag for sale, so you get a magazine of uncompromising quality and reliability that’s built to last and ready to run hard. When failure is not an option, these magazines deliver on the range, in the field, in a tactical situation, under fire. Load these smooth-feeding magazines to maximum capacity and fire the full 30 rounds you expect. No jams, no misfeeds, no hangups.

All components are made of mil-spec materials and are manufactured under strict, ISO quality control standards. The heat-treated, welded aluminum body is hard-anodized for superior corrosion resistance, then given a tough, dry-lube coating to eliminate the need for additional lubricants that would attract dust, sand, or dirt. The latest military-type, glass-fiber reinforced composite follower further guarantees flawless feeding in the harshest tactical conditions. Choose from our high lubricity, dry-lube-coated chrome silicon spring that’s corrosion-resistant certified to 500 hour salt spray standards, and less prone to spring “set.” Updated material and design features like those in our 30-round magazine have been adapted to our straight-bodied, 20-round model. All models are available in standard military Gray. Since we manufacture these mags ourselves, we can maintain a large inventory. So, if you need magazines in a hurry, even in quantity, we can get them to you ASAP.


AR-15, Issue:11, Page:059
Big Book Catalog, Issue:71, Page:066
Sinclair, Issue:5B, Page:247

SPECS: Aluminum body, hard-anodized, dry-lube coating. Fiberglass-filled plastic follower. Magazine available in Gray with dry-lube-coated chrome silicon (CS) spring. 30-round capacities.

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Updated design of the standard AR-15 bolt features a fully supported breech face and a dual-spring extractor system for extra strength and ... Updated design of the standard AR-15 bolt features a fully supported breech face and a dual-spring extractor system for extra strength and ...

Ar-15 Advanced Combat Bolt Assembly 6.8 Spc Ii/224 Valkyrie Lwrc International.

Upgraded Design For Increased Durability & Dependability

Updated design of the standard AR-15 bolt features a fully supported breech face and a dual-spring extractor system for extra strength and reliability to handle the 6.8 Remington SPC II or 224 Valkyrie cartridge. Machined from an extremely hard steel alloy normally used in high-stress/heat applications like race car transmissions, then shot-peened and x-rayed for flaws before plating with a nickel-boron (NiB) coating. NiB coating significantly reduces friction coefficient, so the bolt is less likely to be hung up by fouling, and wear-resistance is greatly enhanced. Super-slick surface makes cleanup easy because carbon and gunk have a hard time sticking to it.


AR-15, Issue:11, Page:013
Big Book Catalog, Issue:71, Page:013

SPECS: Ultra-hard steel alloy, nickel-boron plated, silver finish. Comes complete with ejector, extractor, and gas rings installed. Fits a standard AR-15 carrier.

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The MAGPUL PMAG GEN M3 polymer magazine continues to revolutionize magazine technology for the AR-15 / M4 platforms. The third-generation PMAG further ... The MAGPUL PMAG GEN M3 polymer magazine continues to revolutionize magazine technology for the AR-15 / M4 platforms. The third-generation PMAG further ...

Ar-15 30rd Pmag Gen M3 Magazine 223/5.56 Magpul.

Super-Durable & Ultra-Dependable PMAG Refined & Battle-Hardened By Combat Experience

The MAGPUL PMAG GEN M3 polymer magazine continues to revolutionize magazine technology for the AR-15 / M4 platforms. The third-generation PMAG further expands the strength, reliability, and versatility of the original PMAG.

The MAGPUL PMAG GEN M3 is molded from a polymer formula that delivers distinctly greater resistance to crushing and all forms of impact, with extra reinforcement in the mag catch and feed lip areas.

  • Long-life USGI-spec stainless steel spring
  • Four-way anti-tilt follower and constant-curve internal geometry for reliable feeding
  • Tool-less disassembly for easy cleaning
  • Pop-off dust cover helps minimize debris intrusion
  • Removable floorplate is both stronger and slimmer
  • Fully compatible with the HK® 416 and MR556A1, M27 IAR, British SA-80, and FN® SCAR™ MK 16/16S.

The MAGPUL PMAG GEN M3 features pen dot matrix on each side providing consistent ID marking that resists handling wear. PMAG 30 is available with plain, solid sides.


AR-15, Issue:11, Page:061
Big Book Catalog, Issue:71, Page:067
Sinclair, Issue:5B, Page:247

SPECS: Impact/crush-resistant molded hard polymer, Black or Coyote Tan. Compatible with AR-15/M4/M16, HK® 416, MR556A1, M27 IAR, British SA-80, FN® SCAR™ MK 16/16S, and other similar lowers. 5.56mm/.223 ammunition only.

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The Polymer80 PF940v2 80% Frame designed for Glock® pistols brings the do-it-yourself gun build to the next level, allowing Glock® aficionados to ... The Polymer80 PF940v2 80% Frame designed for Glock® pistols brings the do-it-yourself gun build to the next level, allowing Glock® aficionados to ...

Pf940v2 80% Frame Polymer Aggressive Texture For Glock® Polymer80.

Build Your Own Custom Handgun

The Polymer80 PF940v2 80% Frame designed for Glock® pistols brings the do-it-yourself gun build to the next level, allowing Glock® aficionados to build an entire polymer-frame pistol from scratch, all from components shipped right to their front door.

The Polymer80 PF940v2 Frame ships as an incomplete pistol frame, so it isn't classified as a firearm. The company includes a complete finishing jig, along with all of the drill bits and end mill needed to produce a fully functioning pistol frame.

  • Can be used with 9mm & .40 S&W Glock® components
  • Works only with Gen 3 Glock® parts
  • Features aggressively texture frame for enhanced grip
  • Available in black, FDE, OD, grey and coyote colors

The Polymer80 PF940v2 also features a locking block and rear rail module made from stainless steel to ensure a lifetime of reliable performance.

Returns will not be accepted once the receiver is modified in any way. All warranty issues will be directed to the manufacturer.

“GLOCK” is a federally registered trademark of Glock, Inc. and is one of many trademarks owned by Glock, Inc. or Glock Ges.m.b.H. Brownells is an independent dealer of parts and accessories for Glock® pistols, and is not affiliated with or endorsed by Glock, Inc. or Glock Ges.m.b.H. The use of Glock on this page is merely to advertise the sale of Glock parts or components. As indicated in the product descriptions, not all parts and accessories on this site are official Glock products.


Big Book Catalog, Issue:71, Page:216

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The special feature of Aluma-Hyde II (and the reason for its development) is its increased resistance to bore cleaners, solvents and other ... The special feature of Aluma-Hyde II (and the reason for its development) is its increased resistance to bore cleaners, solvents and other ...

Aluma-Hyde® Ii Brownells.

Durable Epoxy Base Paint Withstands Bore Cleaners & Solvents

The special feature of Aluma-Hyde II (and the reason for its development) is its increased resistance to bore cleaners, solvents and other cleaning chemicals, even trichloroethylene. Today’s family of fast, aggressive bore cleaners really do a terrific job getting dirty gun bores sparkling clean, but they can wreak particular havoc with any other finish they contact. After full cure, Aluma-Hyde II proved solvent-proof to all but the most aggressive, copper-removing bore solvents. Aluma-Hyde II is formulated with a hard-curing epoxy base that contains additional, high-density pigment for a durable finish that sticks to all properly prepared aluminum and alloy surfaces, steel and plastics - it’s great on synthetic stocks. Aluma-Hyde II is available in a variety of colors to help the gunsmith match the vast number of applications found in the average gunshop. Matte finishes are available in Parkerizing Gray (medium gray), Dark Parkerizing Gray (medium dark), Stainless Steel Gray (light), Earth Brown, Matte Clear, O.D. Green for creating camo pattern stocks, Desert Tan (light, desert-tan sand), Coyote (light, gray-brown) and the original favorite, Matte Black. Also available is Semi-Gloss Black which can be used to compliment the matte finishes or give you a black finish that is less matte if you desire. We like the Matte Black color for refinishing those used AR-15 buttstocks and handguards you pick up when building a parts gun, knock-around “truck” guns and, of course, anodized parts.

Aluma-Hyde II dries to the touch in only minutes and reaches full cure in about a week. Here’s the way we apply it: Warm the part and the Aluma-Hyde II to about 90? F.; spend a couple of minutes shaking the daylights out of the Aluma-Hyde II and apply a medium coat for good coverage. You can recoat in a few minutes but don’t wait more than thirty minutes. Once Aluma-Hyde II starts curing, you must wait until it’s fully cured to recoat. You can cut the cure time to approximately two days by circulating warm air (90? F. works fine) past the part. Absolutely no primer coat is required for a tough, durable, abrasion-resistant, rustproof finish that blends beautifully and compliments all gun finishing applications.

Brownells Guntechs recommend use of 084-179-004 All Purpose Clean Out Nozzle prior to attempting to spray this product.


1911, Issue:04, Page:062
AR-15, Issue:04, Page:077
Big Book Catalog, Issue:71, Page:400

SPECS: 12 oz. (340 g) aerosol can.

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