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upper receiver

In firearms terminology, the firearm receiver or firearm frame is the part of a firearm which integrates other components by providing housing for internal action components such as the hammer, bolt or breechblock, firing pin, extractor and trigger mechanism, and has threaded interfaces for attaching ("receiving") external components such as the barrel, stock, grip and mounts of telescopic sights. The receiver is often made of forged, machined, or stamped steel or aluminium; in addition to these traditional materials, modern science and engineering have introduced polymers and sintered metal powders to receiver construction.

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Recent contents
  1. HNL2PDX

    Zenith Firearms mp5k upper receiver ***trades added***

      1. For Sale
      2. For Trade
    • $400
    • Portland
    • Oregon
    Lightly used stripped but with tri lug barrel upper receiver from zenith firearms for an mp5k build. Also comes with pic rail mount installed. This receiver is the part that has to be run at an ffl. Looking for $400 Possible trade items..... -mp5k telescopic stock (b&t style preferred) -g17...
  2. I

    MCX-R 5.56 16 complete upper receiver BNIB

      1. For Sale
    • $1100
    • Albany
    • Oregon
    Taken right off the lower out of the box. Using the lower for a project gun in 6.5 Grendel so thought I'd get rid of the one it came with to fund its replacement. These upper receivers are nearly identical to the MCX spear LT aside from: No forward assist ($50 direct from Sig and easily...
  3. GoBeavs_17

    Aero Precision M5 Threaded Assembled Upper Receiver

      1. For Sale
    • $120
    • Wasco
    • Oregon
    Brand new Aero Precision M5 Threaded Assembled Upper Receiver. Never been shot through. Installed on rifle and then decided to upgrade to the enhanced upper so I could get the enhanced handguard. No longer have the box it came in. Willing to ship for additional $10
  4. HNL2PDX

    Century AP5M(mp5k) upper receiver stripped but barreled

      1. For Sale
      2. For Trade
    • $500
    • Portland
    • Oregon
    Have a century arms ap5m (mp5k) upper receiver. Its stripped but has the barrel and front sight still. This is the part that has to be transferred at an ffl. Just need to get the upper parts and a lower and youll be up and running. Low round count, less than 200rds through the barrel. Looking...
  5. T

    Genuine Colt Factory OEM M4 AR15 Upper Receiver Cage Code Marked 13629 Square BAFE Near Mint

      1. For Sale
    • $400
    • Portland
    • Oregon
    Hello, I have for sale two near mint condition Colt Factory OEM M4 AR15 Upper Receivers. Colt Cage Code Marked 13629 BAFE Square Forge Mark. Machined with M4 Feed Ramps and laser engraved T-marks on the Picatinny rail. A thoroughbred upper receiver perfect for a new duty gun or clone build...
  6. T

    Geissele 14.5" AR-15 URG-I 5.56x45mm NATO Complete with Custom Geissele Trigger

      1. For Sale
    • $2000
    • Portland
    • Oregon
    Hello, I am selling one of my Geissele 14.5" AR-15 USASOC URG-I Upper Receiver Group Improved 5.56x45mm NATO Complete parts list: "Geissele" Daniel Defense cold hammer-forged barrel, 14.5-in., 1-7 twist, NATO chamber (released in 2020 Geissele MK16 Super Modular Rail, 13.5-in. DDC Geissele...
  7. LE80

    BCM BFH 16" Mid Length Complete Upper Receiver w/ MCMR-15 Handguard W/SureFireWarcomp

      1. For Sale
    • $850
    • VANCOUVER
    • Washington
    BCM BFH 16" Mid Length Complete Upper Receiver w/ MCMR-15 Handguard W/SureFireWarcomp
  8. TheDude1

    New Frontier Armory Side Charging Upper Receiver

      1. For Sale
    • $60
    • Corvallis
    • Oregon
    I have an unused New Frontier Armory side charging AR-15 upper receiver that I purchased and never got around to using. I did hand lap it, as I do with all of my builds. It does have a few rub marks near the ejection port from being moved around in the safe as shown in the last photo. $60 shipped.
  9. outontherange

    A2 upper receiver

      1. For Sale
    • $150
    • Portland
    • Oregon
    A2 upper receiver for sale. Great used condition. Can meet up
  10. Larsoc

    Ar15 Upper receiver. Near Portland/hillsboro.

      1. Want to Buy
      2. Want to Trade For
    • Beaverton
    • Oregon
    Looking for a quality stripped or complete upper around town. Show me what you gottttt.
  11. D

    Upper Receiver, Square Forge w/ free magazine

      1. For Sale
    • $50
    • Boise
    • Idaho
    Square forge slickside / sporter upper receiver. Original owner said he put 40 rounds down, never got around to building myself. Price includes shipping, paypal or venmo, not interested in trades. I'll include either one ets glock mag OR pmag with purchase if state law permits from this ad...
  12. Roadpirate2322

    AR-10 stripped upper receiver

      1. For Sale
    • $40
    • Albanu
    • Oregon
    $40. Possibly a cmmg unmarked. Scrapes and marks on it. $45 shippped
  13. U

    Geissele FBI HRT Builders kit

      1. For Sale
      2. For Trade
    • $700
    • Tigard
    • Oregon
    Geissele ODG Fed rail, Geissele ODG buffer tube, 11.3 inch barrel, Geissele gas block, SF 4p. Everything is new.
  14. 357SigGuy

    Aero Precision M4E1 Enhanced 20 6.5 Grendel Complete Upper Receiver - Price Drop

      1. For Sale
      2. For Trade
    • $550
    • Washougal
    • Washington
    Aero Precision M4E1 Enhanced 20" 6.5 Grendel Complete Upper Receiver Proof Research Barrel 6.5 Grendel 20" Rifle Length 1 in 8" Twist Stainless Steel Fail Zero bolt carrier group Aero Precision 15" Key Mod handguard Bravo Company Gas Block and charging handle Precision Armament M41 Severe Duty...
  15. NW PREPPER

    PSA Complete Upper Receiver

      1. For Sale
    • $300
    • Rockaway beach
    • Oregon
    Have a Palmetto State Armory complete upper, excellent condition. Less than 200rds through it. Comes with: Magpul handguard Magpul vertical grip UTG carry handle PSA nickel Boron bolt carrier group Charging handle Asking $300 shipped OBO Sorry no shipping to CA or WA.
  16. J

    11.5'' Sionics 5.56 Upper Receiver

      1. For Sale
    • $600
    • Eagle
    • Idaho
    Selling my lightly used 11.5" Sionics Upper. Willing to separate the parts at $475 for the stripped version or $600 with BCG and charging handle. Upper Receiver: 7075 M4 AR15 Style 5.56mm NATO Barrel: SIONICS 11.5" Medium Contour – 41V50, NATO Chamber, 1:7, 5R Rifling, Chrome Lined...
  17. 8

    Lefty Stag AR15 upper receiver, bcg, ch

      1. For Sale
    • $250
    • Albany
    • Oregon
    Left Handed Stag AR15 upper receiver, bolt carrier group and Aero Breach charging handle. Excellent near new cond. Very low rounds. $250 cash FTF in Albany, OR $270 shipped discrete PP F&F Text 541-990-4711
  18. outontherange

    Daniel Defense Upper receiver

      1. For Sale
    • $150
    • Portland
    • Oregon
    Selling just the upper receiver from a Daniel Defense. Logo is nice and clean on front left. This is a great replacement on your Daniel upper! Sell to Oregon only.
  19. LE80

    Daniel Defense CONTRACT OVERRUN UPPER RECEIVER GROUP

      1. For Sale
    • $1100
    • Vancouver
    • Washington
    New never shot DD upper in 5.56 NATO
  20. RobMa

    Excellent condition Rock River Arms A2 upper receiver with Cardinal forging mark

      1. For Sale
    • $175
    • Seattle
    • Washington
    Excellent condition Rock River Arms A2 upper receiver with Cardinal forging mark Recently purchased this and decided to go another route. This could be great for a retro build. Please PM for any questions. Crossposted on ARFCOM No sales to restricted states... sorry I take PayPal friends...
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