AR15 M4 M16 Stripped Upper Receivers:
Theres several variations of stripped AR15 upper available. Theres an upper for every purpose. Aside from the standard A2, A3 configurations there is smooth sided, side charging, high top, left handed and mission specific uppers. A quick look at the Brownells site shows 14 options in their catalog.
Update November 24, 2010: What a difference a year and a half makes. A quick trip to Brownells revealed so many more options for stripped AR-15 uppers. It's going to take me a while to finish this page so for now many of the links go to the Brownells individual product page. Keep in mind quite a few of the less expensive options are made bty the same handful of manufacturers regardless of the brand name.
Brownells Stripped, A3-style upper receiver is precision machined from a 7075 T6 aluminum alloy forging to USGI dimensions, ready to mate with the mil-spec lower and internal components of your choice. Includes M4-type feed cuts and alphanumeric position markers stamped into the rail slots. Extra hard 7075 T6 alloy offers superb strength to handle the battering of thousands of firing cycles. Hardcoat anodized to resist wear, add strength, and protect from corrosion. Hard dry-lube surface treatment protects the anodizing from scuffs and reduces friction between bolt carrier and receiver walls for ultra-smooth operation, less wear, and longer service life. Matte black finish matches most factory upper receiver and barrel finishes. Logos will not fade or wear off. Available with Rifleman’s Creed or Zombie Hunter logo.
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As of this time CMMG offers A2,A3 uppers hardcoat anodized as per Mil-A-8625 with black Teflon coating. All things being equal CMMG has a great sales staff and customer service. They answer the phones and return calls.
 
The MUR is a rigid MilSpec flat-top upper receiver made to fit all AR15/M16/M4 rifles and carbines.
The MUR was developed to give the customer a MilSpec correct upper receiver with a thicker wall making the MUR upper receiver a more rigid platform. A more rigid upper receiver will increase accuracy and reliability while extending the life of interfacing components such as the bolt carrier group and barrel assembly.
The main benefit of the MUR is it's dimensionally correct. Unfortunately, with the current war effort, a number of AR suppliers are rushing through production, bypassing critical dimensions which will either make or break the reliability and accuracy of the weapon. With the existence of the MUR, you'll receive the best and highest quality upper receiver available on the market today.
The MUR comes in two models: one with a Bolt-Assist/Shell-Deflector and the second with a Shell-Deflector only. Being a modular design, Vltor offers the service of exchanging the Bolt-Assist assembly for a Shell-Deflector only assembly and vise-versa.
All MURs feature a MilStd-1913 scope mounting rail and come equipped with an Ejection-Port, Dust Cover Door.
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This is one of the more interesting AR15 stripped upper receivers available. The ASA Flat Top Side Charger Upper Receiver features a left side charging handle thats modeled very much like a FAL Rifle.
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Adams Arms
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Forged AR-15 Upper Receiver Makes The Perfect Base For Your AR Top-End. The Wilson Combat Upper AR Receiver is manufactured from forged aluminum and is a perfect match to the new Wilson Combat Lower Receiver.
Olympic Arms
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Double Star
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Yankee Hill Machine
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Stoner
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Ready-to-install flattop upper receiver is forged from high-grade 7075 T6 aluminum alloy for exceptional strength to handle the battering from thousands of firing cycles, even with full-power military ammo. Precision CNC machined to final, mil-spec dimensions with tolerances of less than .001", so you can select the barrel, bolt assembly, carrier, charging handle, and other components that suit your specific needs. Standard .250" pivot and takedown pin holes ensure compatibility with a broad variety of lower receivers. Pre-installed forward assist and ejection port cover save you time during assembly. Includes integral shell deflector and 5˝" long Picatinny accessory rail for maximum flexibility in mounting scopes, red dot reflex sights, and flip-up “iron” backup sights. Hardcoat anodized to MIL-A-8625 Type III Class 2 spec to ensure superb surface hardness, before application of a tough, commercial-grade Teflon® coating to resist the scratches, scuffs, and dings of hard competition or tactical use.
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Stripped, A3-style upper receiver is precision machined from a 7075 T6 aluminum alloy forging to USGI dimensions, ready to mate with the mil-spec lower and internal components of your choice. Includes M4-type feed cuts and alphanumeric position markers stamped into the rail slots. Extra hard 7075 T6 alloy offers superb strength to handle the battering of thousands of firing cycles. Hardcoat anodized to resist wear, add strength, and protect from corrosion. Hard dry-lube surface treatment protects the anodizing from scuffs and reduces friction between bolt carrier and receiver walls for ultra-smooth operation, less wear, and longer service life. Matte black finish matches most factory upper receiver and barrel finishes.
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