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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. Foggy3

    New unfired 16” 5.56 upper *Aero Precision MI Ballistic Advantage

      1. For Sale
      2. For Trade
    • $600
    • Puyallup
    • Washington
    Recently built this 16” upper for fun, but realize I don’t really need it. Details as follows. Aero Precision upper and gas block, Ballistic Advance 16” HBAR 5.56 barrel, A2 birdcage, Midwest Industries 15” Mlok rail, Arisaka vert grip. No CH/BCG. Only trade id be interested in would be an...
  2. UNO

    16" 5.56 Upper w/extras

      1. For Sale
      2. For Trade
    • $475
    • PORTLAND
    • Oregon
    I have a Diamondback DB15 Elite upper im looking to sell to fund a new build Has around 400 rounds through it. Purchaced brand new at curts a couple months ago. 5.56 nato 16" 1/8 twist chrome lined barrel 15" Mlok handguard Magpul vertical foregrip Timber creek forward assist Flash hiding...
  3. Mjb9164

    Colt M4 5.56 Upper

      1. For Sale
    • $550
    • Tacoma
    • Washington
    Hello, I'm selling a brand new, never used M4 LE6933 Colt 11.5in Upper. Its a stripped upper, no charging handle or BCG, selling it just the way I bought it from Brownells. I'm asking what I paid for it, $550. Not interested in trades at this time. If you're interested message me on here or...
  4. FireArm

    Side charging 5.56 upper complete

      1. For Sale
      2. For Trade
    • Sheridan
    • Oregon
    Complete upper only New BCA 10.5” side charging AR15 upper 5.56mm Carbine length gas system Right side charging mlok handguard bought it not gonna use it. $360 FTF $380 shipped looks like BCA lowered the price since I got this so I will do the same. Price lowered im located in Sheridan for...
  5. 3gunRJ

    Larue Tactical Stealth 5.56 Upper - 18" with BCG

      1. For Sale
    • $850
    • WASHOUGAL
    • Washington
    Brand New (in the box) Larue Tactical 18"upper (P/N LT011--18-13.2) with BCG, and 13.2" handguard, in 5.56 caliber. $850 firm. Retail price was $1195 (I have the reciept). I can meet you in the Vancouver/Orchards area. Thanks!
  6. R

    5.56 Upper

      1. Want to Buy
    • Lebanon
    • Oregon
    Looking for a 5.56 or .223 wylde upper in 16”
  7. 8x68s

    Radical Firearms 16", 5.56 Upper

      1. For Sale
    • $300
    • Salem
    • Oregon
    WTS 5.56 upper with approximately 100 rounds down the tube. Standard 16" model offered by Radical Firearms (see link). Complete with BCG. Sells for $450 new. Selling at a firm price of $300 face to face or can ship for $325. No trades! Moving to 6mmARC... PM me here...
  8. zx14

    complete areo 11 inch 5.56 upper

      1. For Sale
    • $500
    • Vancouver
    • Washington
    like new factory complete areo 11 inch 5.56 upper , with areo bcg, strike industries ch. only a few mags thew it 500 cash. 400cash if u dont need bcg
  9. Crazyeye24

    Complete 5.56 Upper - Sold

      1. For Sale
      2. For Trade
    • $500
    • Beaverton
    • Oregon
    Was stuck at home during post stroke recovery and bought a bunch of parts out of boredom and ended up building an upper I don't really need so I thought I'd offer it up. Cost me just over $500 to build not including shipping but I'm asking $500 for the setup. I do have a Sig Sauer MSR Red Dot I...
  10. Tack_Ryan

    20" Heavy Barreled 5.56 Upper With Magpul, VG6, and BCM Accessories

      1. For Sale
    • $275
    • Banks
    • Oregon
    For sale is a 20" Bear Creek Arsenal Heavy Barrelled Upper Receiver chambered in 5.56. Easily shoots out to 500 yards with irons alone. Very smooth cycling. Added a Magpul Handguard, VG6 Delta Muzzle Device, Blitzkreig Components Chevron Front post sight, Harris Style bipod with tilt, and BCM...
  11. Mygrainman

    10.5” 5.56 upper

      1. For Sale
      2. For Trade
    • $550
    • Kelso
    • Washington
    Really nice upper here.. New 10.5” 4150v Nitride barrel, 9” Troy Rail with lots of squid grips and extra rail sections(more than pictured) MBUS sights Chrome lined BCG Ambi Charge handle (Little ding on the upper rail see pic) $550 cash $425 without BCG, CH, and Sights. trades I need Silver...
  12. P7M13

    PSA AR15 16" 1:7 5.56 Upper w/ BCG & CH

      1. For Sale
    • $350
    • Beaverton
    • Oregon
    $350 o.b.o. Mounted it once and shot a box through it to make sure it worked. It does. PM if interested or for details. Meet at Beaverton Town Square. 16" barrel / compensator / mid-length gas. The pictures say everything else.
  13. O

    Factory Aero Precision Complete M4E1 7.5" 5.56 upper, New and unfired

      1. For Sale
    • $400
    • Monroe
    • Oregon
    Brand new and unfired factory assembled 7.5" Aero Precision 5.56 upper. Placed on a lower but never fired. Link to specs: M4E1 Threaded 7.5" 5.56 Complete Upper Receiver w/ ATLAS S-ONE Handguard Price is $400 without BCG or $500 with phosphate Aero Precision BCG.
  14. P

    Aero AR15 14.5 UPPER FOR 10.5 UPPER.

      1. For Trade
    • Spokane
    • Washington
    i have an Aero Precision 14.5" 5.56 upper with Type R handguard. The upper has less then 150rds and is in near perfect condition. I only want to trade upper, I'm keeping my bcg/CH and accessories. Wife really wants the 10.5" Aero Precision upper with the M-lock or the picatinny handgaurd. If...
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