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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. fredridge

    Foxtrot Mike 12.5 upper

      1. For Sale
      2. For Trade
    • $500
    • Vancouver
    • Washington
    Foxtrot Mike 12.5 I believe it’s .223 Wylde Lots of extra parts, handguard, springs, charging handle Suppressor spring Stile Industries multi angle grip Vortex strike fire II Cheap amazon BUIS Rail scales Keymo three prong flash $500 with all the extras $400 without the optic, grip, BUIS...
  2. GoPackGo

    BCA 16 Inch Bolt Action AR 5.56 Complete Upper (NEW, Unfired)

      1. For Sale
    • $175
    • Seattle
    • Washington
    Like title says, got one new, unfired for sale. Works with any milspec lower. WA Legal and all of that goodness! For sale $175 OBO. Goes for $200 + Tax from the website. Save a few bucks! 16" Black Nitride Cold Hammer Forged M4 Barrel | 1:7 Twist | Talon 15" MLOK Split Rail.
  3. jmenne

    Bear Creek Arsenal 5.56 upper and SBA 3 brace

      1. For Sale
    • $150
    • Sheridan
    • Oregon
    Got the upper in a trade and haven't really done anything with it aside from about 30 rounds. Runs well, and there's no gas to the face since it's a side charger. Unsure of the barrel length, but I think it's 9.5" or 10". I did cut a small bit off the end of the handguard to fit suppressors...
  4. arakboss

    5.56 AR15 Upper BA Barrel, Aero BCG, KDG MREX MLOK Handguard

      1. For Sale
    • $280
    • Wilsonville
    • Oregon
    For sale is a used AR15 upper. The Ballistic Advantage 16" barrel is chambered in 5.56 NATO with 1/7 twist, and marked HP and MP. Gas block is pinned and is a midlength gas system. The BCG is Aero brand. Handguard is from Kinetic Developement Group, model MREX-AR. Upper receiver is from Midwest...
  5. trukinbear

    Done  16" 5.56 upper A2 15" quad M-lok slant cut - $147.96

    https://www.righttobear.com/bg-16-5-56-upper-receiver-a2-15-quad-m-lok-without-bcg-ch/
  6. trukinbear

    16" 5.56 upper A2 15" quad M-lok slant cut - $147.96

    https://www.righttobear.com/bg-16-5-56-upper-receiver-a2-15-quad-m-lok-without-bcg-ch/
  7. T

    Noveske 10.5" 5.56 Upper

      1. For Sale
    • $950
    • Portland
    • Oregon
    Like new, complete Noveske 10.5" 5.56 Upper with 200 rounds shot thru it. Functions flawlessly, I just do not need another 10.5" upper. Added a photo on the end of the rail where a suppressor slightly dinged the edge. Let me know if you have any questions or would like more photos. Also new...
  8. Busyhawk

    Bear Creek AR15 UPPER 5.56 NATO Side Charger W/BCG for $350

      1. For Sale
    • $350
    • SHELTON
    • Washington
    I have 3 of these and use 2 of them so this NIB side charging Bear Creek with Forged upper is on the chopping block. I am attaching a link for a complete rifle by Bear Creek because I can not find just an upper for sale. Bear Creek AR15 Rifle 5.56 NATO Side Charger Bear Creek Arsenal AR15...
  9. Roadpirate2322

    Solgw 13.7 5.56 upper pinned War-comp

      1. For Sale
    • $750
    • Lebanon
    • Oregon
    Less than 500 rounds fired. Factory M76 13.7” barrel with pinned surefire open tine Warcomp. Comes with very grip and QD socket. $750 ftf $800 shipped
  10. B

    16 Spear LT. MCX 5.56 upper *price drop*

      1. For Sale
      2. For Trade
    • $900
    • Portland
    • Oregon
    I have a black spear LT upper for sale. Has some wear marks and was not a safe queen. The upper retails for $1600 at the moment. This would be a good "low" cost entry to a short stroke piston rifle. Price: $980 dropped to $900 Condition: Used Comes with: -barrel taper -Timed rearden nitrided...
  11. Lilhigbee

    Olympic Arms 20" Heavy Barrel 5.56 upper

      1. For Sale
    • $350
    • Potland
    • Oregon
    For your consideration I have an Olympic Arms AR upper in 5.56 with a 20" heavy barrel. It comes with A2-style sights, flash hider, round hand guards, charging handle, etc. No BCG!! The upper is in excellent condition with a bright, shiny bore. I've had a couple of inquiries about the...
  12. B

    Complete 5.56 upper

      1. For Sale
    • $180
    • Buckley
    • Washington
    Complete 5.56 upper that I received a while back on a rifle that I put another upper on. Not sure what the brand of this one is, it has a Midwest Industries quad rail. Everything is in good working condition 16 inch barrel not welded. FS/ ONLY
  13. Gunbuggy

    Cheap 18-20 inch 5.56 upper

      1. Want to Buy
      2. Want to Trade For
    • Amboy
    • Washington
    Looking to source a cheap 5.56 or 223 wylde barreled upper for a little medium range plinker for my property. Doesn’t have to be anything special but want it to be in good shape. Don’t care if it’s rattle canned. Don’t care if it’s free floated or quad but no keymod. Located in Amboy / North...
  14. D

    11.5 5.56 upper

      1. For Sale
    • $450
    • Scappoose
    • Oregon
    Hi, this is a 11.5 aero upper, comes with aero bcg no charging handle. (Pic has optic, light and grip not for sale) has maybe 500 rounds through it. This upper is 100% aero precision but the geissele mk16 handguard I got as a blem. and eotech on the Unity riser is posted...
  15. DG43

    11.5" SIG SPEAR LT 5.56 Upper + Extras

      1. For Sale
    • $900
    • Glendive
    • Montana
    Selling a SIG SPEAR LT 11.5" upper in 5.56, complete with the SIG folding pistol brace, MCX stock adapter for use with AR-pattern lowers, and ASR muzzle brake already installed. Upper has approximately 2,000 rounds through it from the previous owner and about 500 rounds by me. Not looking to...
  16. tunapackets

    PSA 10.5 Hex Mlok 5.56 Upper Rattle Canned

      1. For Sale
    • $50
    • EUGENE
    • Oregon
    She's ready for a touch-up, but the round count is low. No bcg or carry handle No shipping or travel
  17. Hines11b3x

    13.9 5.56 upper with lpvo

      1. For Sale
    • $3000
    • Stayton
    • Oregon
    Complete upper and LPVO set up for sale Upper; BCM thermal fit receiver 13.9” Triarc track 2.0 mid length bbl Les than 300 rds on bbl V seven SS gas block Daniel Defense 12” RIS III mlok rail FDE Surefire close tine flash hider SOLGW bcg Raptor SD charging handle Optic; Leupold MK6 1-6...
  18. Tack_Ryan

    KAK 16" Dissipator Complete 5.56 Upper

      1. For Sale
    • $480
    • Lindale
    • Other
    For sale is a complete KAK Industries 16" rifle length gas Dissipator upper. Chambered in 5.56,1.7 twist, rifle length gas, with an adjustable gas block to fine tune the upper suppressed or not. Comes with gas busting Breek Arms Sledgehammer charging handle, and KAK K spec full chrome downward...
  19. tdemore1743x

    7.5in 5.56 upper for 10.3/11.5/12.5/13.7in 5.56 upper

      1. For Trade
    • Olympia
    • Washington
    Up for trade is a complete PSA 7.5in AR upper chambered in 5.56. Nothing wrong with it, just would prefer something a little bit longer for my SHTF loadout. Barrel has 1:7in twist, less than 300rds through it. Depending on trade, it will include the mbussys, red dot, WML, flash can and BCG...
  20. J

    5.56 complete upper

      1. For Sale
    • $350
    • Salem
    • Oregon
    Always armed 5.56 upper in FDE. With Rise Armament carrier group war hammer charging handle and magpul gen2 sights. $350.00. 503-881-3440.
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