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5.56 upper

The 5.56×45mm NATO (official NATO nomenclature 5.56 NATO, fyv-FYV-six) is a rimless bottlenecked intermediate cartridge family developed in the late 1970s in Belgium by FN Herstal. It consists of the SS109, SS110, and SS111 cartridges. On 28 October 1980 under STANAG 4172 it was standardized as the second standard service rifle cartridge for NATO forces as well as many non-NATO countries. The 5.56×45mm NATO cartridge family was derived from and similar in dimensions to the .223, but is not totally identical to the .223 Remington cartridge designed by Remington Arms in the early 1960s.

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Recent contents
  1. Tack_Ryan

    11.3" Complete BA Hanson Barreled 5.56 Upper with Brace

      1. For Sale
    • $550
    • Lindale
    • Other
    For sale is a custom built complete upper receiver from B King Firearms. Features a Ballistic Advantage Hanson 11.3 5.56 Barrel with pinned gas block, Breek Arms 3 prong flash hider with removable flash can, BKing Mod-0 thermal fit upper with free float mod-0 handguard, Breek Arms Sledgehammer...
  2. T

    NIB Aero M4E1T 10.5 5.56 Upper

      1. For Sale
    • $225
    • Albany
    • Oregon
    NIB Aero M4E1T 10.5" 5.56 Upper Bought for a project and decided to go a different direction. Does not include BCG or charging handle Brand new just been in my safe. New: $359.98 Asking &225 obo
  3. T

    NIB Aero M4E1T 10.5 5.56 Upper

      1. For Sale
    • $225
    • Albany
    • Oregon
    NIB Aero M4E1T 10.5" 5.56 Upper Bought for a project and decided to go a different direction. Brand new just been in my safe. New: $359.98 Asking &225 obo
  4. BrandoCommando

    AR 5.56 upper, no BCG

      1. For Sale
    • $400
    • Puyallup
    • Washington
    Combat Armory Billet upper Rise armament Dust cover and forward assist Ballistic Advantage 16" mid length 5.56 with pinned gas block, Barrel nut is torqued to 46in/lbs Black River Tactical custom gas tube AT3 15" Spear M lok handguard in Magpul OD Green Precision Armament EFAB muzzle device with...
  5. D

    Wilson Combat/Aero MK12 18 5.56 Upper with Surefire Warcomp $470

      1. For Sale
    • $470
    • Estacada
    • Oregon
    Bought from a buddy last week, decided to go a different route. Aero upper Midwest Industries 12.625” quadrail Wilson Combat 18” barrel with gas block and tube Surefire Warcomp CTN (Geissele takeoff, no SF mark) I’ll ship for $20 or face to face in Estacada/Sandy
  6. 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...
  7. Duneblaster

    Stag Arms 10.5" 4150V QPQ 5.56 1:7 Upper

      1. For Sale
    • $290
    • Roseburg
    • Oregon
    Unfired barrel, all parts are brand new. Complete, except for a gas block & muzzle device. This is new and has never had a gas block installed. 9" ATLAS R-One M-Lok handguard. The receiver was Thermo-Fit™ tightly to the Aero barrel. Never had a bolt carrier or charging handle installed. *Some...
  8. J

    Aero Precision 5.56 mid-length upper

      1. For Sale
      2. For Trade
    • $300
    • Coburg
    • Oregon
    Fired exactly 30 rounds threw this upper. No BCG. 100% factory built. $300 firm possible trade for 10.5 300 blackout upper. 541-999-2986 eugene oregon. Prefer face to face sale.
  9. dlh4x4

    BCM Kino 5.56 Upper *NEW*

      1. For Sale
    • $700
    • Lake Stevens
    • Washington
    New, unfired 12.5 BCM ‘Kino’ configuration upper. Includes BCM BCG and mil spec charging handle. Cash, Zelle or Venmo Shipping available for additional cost. https://bravocompanyusa.com/bcm-standard-12-5-carbine-upper-receiver-group-kino-configuration-kmr-alpha-9/
  10. H

    Budget 16 5.56 Upper new/unfired

      1. For Sale
      2. For Trade
    • $275
    • Sagle
    • Idaho
    New/unfired 16" upper in 5.56, includes ch/bcg, no FA. I can't remember where I bought this but it was part of a build kit I picked up a few years ago. Upper is factory built, the lower was the kit. $275 (+ shipping). No shipping to WA or anywhere else where prohibited. Willing to trade for...
  11. sparky8

    11.5" mid-length gas 5.56 upper - SLR Rifleworks, Faxxon, Aero, Burris, BRT

      1. For Sale
    • $450
    • Newberg
    • Oregon
    Up for sale is a 11.5" mid-length 5.56 upper minus BCG and CH. Couple hundred rounds through this upper, thing is an absolute tac driver! Here's what you get - Faxxon 11.5" Gunner barrel in 5.56 w/mid-length gas system - SLR Rifleworks 10.7" Helix MLOK handguard - Mil-Spec Cerro Forged upper...
  12. sparky8

    11.5" mid-length gas 5.56 upper - SLR Rifleworks, Faxxon, Aero, Burris, BRT

      1. For Sale
    • $450
    • Newberg
    • Oregon
    Up for sale is a 11.5" mid-length 5.56 upper minus BCG and CH. Couple hundred rounds through this upper, thing is an absolute tac driver! Here's what you get - Faxxon 11.5" Gunner barrel in 5.56 w/mid-length gas system - SLR Rifleworks 10.7" Helix MLOK handguard - Mil-Spec Cerro Forged upper...
  13. R

    5.56 Upper, No BCG or Charging handle $100

      1. For Sale
    • $100
    • Beaverton
    • Oregon
    DPMS Upper with 5.56, 1/9 twist HBAR barrel, 500ish rounds No charging handle or BCG I remove the A2 site and installed a low profile, stainless gas block. Black Magpul furniture
  14. Richo877

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  15. jdb98

    Triarc 10.5 inch 5.56 complete upper

      1. For Sale
    • $600
    • Vancouver
    • Washington
    10.5 inch complete triarc upper (triarc BCG, and radian raptor CH) I have put 100 rounds through this upper. It shoots very well, and triarc definitely makes good quality stuff. Just trying to make room for other projects. all components listed in attatched photo. Would consider trading for a...
  16. Illuminaughty

    NEW Aero 10.5 in 5.56 Upper, Atlas S-ONE Handguard

      1. For Sale
      2. For Trade
    • $399
    • Veneta
    • Oregon
    Factory built Aero upper, purchased new from factory a few months back. No longer needing due to moving to a rifle platform. No bcg, but happy to toss in a charging handle if ya need. It’s never been fired through, only mounted an optic and light on it once. Paid $540, asking $399 or trade...
  17. Delasangre4231

    10.5" 5.56 Complete Upper

      1. For Sale
    • $300
    • Oregon City
    • Oregon
    Complete ready to shoot upper, includes BCG and charging handle. $300 obo. NO TRADES. Since everyone keeps asking; I don't know the brand of the upper. All I know is the upper is a square forge receiver and the barrel is marked 556 NATO 1/7 but otherwise no brands, I just know it shoots very...
  18. Delasangre4231

    10.5" 5.56 upper

      1. For Sale
    • $600
    • Oregon City
    • Oregon
    Decided to go with a different route. Bought used from a friend, unknown round count, I put maybe 300 rounds through it. Very happy with the performance. No problems. -Unknown brand complete upper. Square Forge mark receiver. Gas key properly staked. -I removed the old quad rail and installed...
  19. Tack_Ryan

    BCM MK2 BFH ELW 16" Complete 5.56 Upper

      1. For Sale
    • $600
    • Lindale
    • Other
    Price Drop to $600 For sale is a Bravo Company Manufacturing (BCM) complete upper With BCG and Charging Handle. Featuring the MK2 enhanced upper receiver with a 13.4" KMR Alpha Rail. Barrel is a 16" Cold Hammer Forged (BFH) chrome lined Enhanced Lightweight with a 1/7 twist and 5.56 chambering...
  20. J

    Sionics 11.5" 5.56 Upper Receiver - Silencer Port

      1. For Sale
    • $600
    • MERIDIAN
    • Idaho
    Selling a gently used Sionics upper. Shoots incredibly smooth suppressed due to the gas port and zero issues functioning without the suppressor. Comes with a Dead Air flash hider, Angstadt BCG and Radian Raptor charging handle. Less than 200 rounds through it with plenty of life left. Raising...
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