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18 inch

The BL 18-inch Mk I naval gun was a breech-loading naval rifle used by the Royal Navy during World War I. It was the largest and heaviest gun ever used by the British. Only the Second-World-War Japanese 40 cm/45 Type 94 had a larger calibre, 18.1 inches (46 cm), but the British shell was heavier. The gun was a scaled-up version of the BL 15 inch Mk I naval gun and was developed to equip the "large light cruiser" (a form of battlecruiser) Furious. Its barrel length of 60' was 40 just calibers, slightly limiting its muzzle velocity.
Only three guns were built, but they did not see combat with Furious before they were removed from her and transferred to the Lord Clive-class monitors General Wolfe and Lord Clive for coast bombardment duties. Only 85 rounds were fired in combat operations before the war ended. All three were removed from service in 1920 and served as proving guns for cordite tests. Two were scrapped in 1933 and the last one survived until it was scrapped in 1947.

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Recent contents
  1. GoPackGo

    BCA Complete AR-10 Bolt Action Upper (308), 18 Inch Barrel - New, Unfired

      1. For Sale
    • $250
    • Seattle
    • Washington
    Selling my new, unfired BCA Complete Bolt Action Upper in 308 - 18" Parkerized SOCOM Barrel | 1:10 Twist | 15" MLOK Split Rail. $250 OBO if local, $265 Shipped.
  2. J

    M1A .308 Squad Scout 18 inch barrel

      1. For Sale
    • $1600
    • Portland
    • Oregon
    Purchase new with factory installed national match windage knob, national match hooded aperture, national match ,bearing and extractor spring, national match tuned trigger. This rifle is extremely accurate and has been shot very little. It is an excellent shape for a used firearm. It comes with...
  3. brewery1

    870 police Magnum 12 gauge 18 inch

      1. For Sale
      2. For Trade
    • $260
    • Dundee
    • Oregon
    870 police Magnum 18 in squad car used , it would make a great project for refinishing 260$ or best offer, thanks
  4. Gunbuggy

    18 Inch Barreled Upper - Ballistic Advantage Premium Black SS - SPR

      1. For Sale
      2. For Trade
    • $210
    • Amboy
    • Washington
    Barrel: 18" 223 WYLDE SPR STAINLESS STEEL RIFLE LENGTH AR 15 BARREL W/ OPS 12, PREMIUM BLACK SERIES This 223 Wylde chambered 18-inch barrel is machined from 416R Stainless Steel with a QPQ finish. Our Premium Black Series Barrels feature a Nickel Boron Coated Extended M4 Feed Ramp Extension. Has...
  5. jsnprtr12

    18 inch .308 AR barrel PRICE DROP

      1. For Sale
    • $75
    • Toutle
    • Washington
    Brand new never used 18 inch .308 black barrel. New never installed on an upper.
  6. jsnprtr12

    18 inch .308 Winchester barrel.

      1. For Sale
    • $50
    • Toutle
    • Washington
    New in packaging .308 Winchester Chamber barrel. New never used. Believe its Columbia River arms.
  7. D

    IWI X95 Tavor 5.56, 18 inch barrel, Geissele, Magpul D-60 drum.

      1. For Sale
    • $1925
    • Bend
    • Oregon
    I am selling this X95 Tavor in 5.56. 1 in 7 twist 18 inch barrel. It is the green on black pattern. I have the Geissele Super Saber trigger https://geissele.com/super-sabra-trigger-pack-iwi-tavor-x95-rifles.html Also installed an IWI full trigger guard grip. I still have the original Saber grip...
  8. lostworld500

    Aero Precision M5e1 AR-10 .308 18 inch w/ Vortex scope

      1. For Sale
    • $850
    • Portland
    • Oregon
    Howdy, I'm looking to sell my lightly used Aero M5 with Mlok. Have shot maximum 50 rounds through it, and have since stowed it. Looking to sell it before Measure 114 officially goes into law. Aero M5 lower Atlas R-one Upper 18 inch chrome lined CHF aero barrel VORTEX diamond back tactical...
  9. jdb98

    Ar15 upper. 18 inch criterion core/BCM etc.

      1. For Sale
    • $450
    • Vancouver
    • Washington
    As the title states, 18 inch BCM upper, re-barreled with criterion core chrome lined barrel. Just trying to thin the heard. About 300 rounds through this upper. $500 for the stripped upper, add $50 for Radian Raptor CH, add $100 for Microbest BCG. Not pictured, but I will throw an a2 flash...
  10. rr15

    BCA Side charging upper 18 inch 223 wylde

      1. For Sale
    • $180
    • Salem
    • Oregon
    i have this 18 inch bear creek arsenal side charging upper for sale, 315 rounds ran through it so its lightly used, (sights are not included) asking $180 obo also open to trades.
  11. itzonlysmellz

    New Odin Works 18 inch 223 Wylde AR15 barrel

      1. For Sale
    • $150
    • Beaverton
    • Oregon
    Hello, Selling my new Odin Works 18 inch 223 Wylde Rifle Length barrel for $150. Can meet anywhere in Hillsboro and Beaverton. Brand: Odin Works Length: 18 inch Profile: "3-Gun" Caliber: .223 Wylde (optimized for 223 rem and 5.56 ammo) Gas System: Rifle Length Adjustable Gas bLock with tools...

  12. Aero AR10 M5 18 inch

      1. For Sale
      2. For Trade
    • $950
    • Portland
    • Oregon
    Standard 18" Aero M5. Never fired. See pictures for complete upper/lower assemblies part numbers. Aero black nitride BCG and Aero charging handle. Handful of 10 round mags. Sale at FFL in Portland Metro only. CASH or trade for: Ammo - 5.56 .308 7.62x54r - non corrosive .22lr...
  13. Babyhuewy

    AR 10 PSA Gen2 308 complete upper. 18 inch stainless

      1. For Sale
    • $400
    • Jefferson
    • Oregon
    Just switched to a railed upper. This is a gen2 that fits DPMS. Complete with BCG and charging handle. Aaking $400 Cash only please, no shipping. Meet up in Albany, Jefferson, or Salem oregon .
  14. Q

    Aero precision 18" 556

      1. For Sale
      2. For Trade
    • $1200
    • Hillsboro
    • Oregon
    -Aero precision lower and upper receiver - 18" ballistic advantage spr barrel, rifle length gas system - precision armament m4-72 compensator - stngr vypr 15" handguard that I painted myself with brownells alumahyde ( it did not come out perfectly) - magpul grip and buttstock - it has a vortex...
  15. ernurse

    WTS: 18 inch Aero Precision 6.5 Grendel upper with extras

      1. For Sale
    • $450
    • Seal Rock
    • Oregon
    18 in barrell Aero Precision , Bushnell AR.223 scope 4.5 x 18 power with butler creek caps, Nitride bolt with spare bolt, MI handgaurds, Bought new , exactly 100 rounds down range. perfect condition. Also have 6.5 grendel magazines and over 2000 rds wolf 100 gr ammo for sale, seperate from...
  16. ob1

    Mossberg 500 18 inch rifle sight barrel ? L F

    • Portland
    • Oregon
    Haven't seen one of these in decades, but I am looking for one of the early 12g Mossberg 18" imp cylinder barrels with the factory rifle sights. From what I recall, they came in Mossberg wrapping and used to be a common accessory back in the 70's. I actually purchased one through the Montgomery...
  17. jdb98

    Complete 18 inch Aero upper (no BCG/CH)

      1. For Sale
    • $350
    • Vancouver
    • Washington
    This upper started out as a factory 16 inch m4e1 upper. I had the barrel swapped with an 18 inch Ballistic Advantage SPR barrel. The barrel swap was done at limitless in washougal. 500 rounds total on this upper, 200 of those through the current 18 inch barrel. Can include a BCG for $80, but...
  18. hammerstriker

    2005-2021 Nissan Frontier 4x4 18 Inch Wheels And Tires *PRICE DROP*

      1. For Sale
      2. For Trade
    • $500
    • Toledo
    • Oregon
    All tires and wheels are in great shape with lots of tread left save for being a little bit dirty. Delivery is available within reason. Will not separate the tires from wheels. Must buy as a set. Will also fit an Xterra of the same generation. Asking $600 OBO **PRICE DROP 7-7-23 $500**
  19. joeg217

    18 inch aero AR10

      1. For Sale
    • $1000
    • Albany
    • Oregon
    Has 200 rounds through it. I purchased both the upper and lower fully assembled from Aero. .308 Has a cheap hardline optic on nothing fancy Radians raptor SD charging handle. Nitride BCG Has a dead air air keymo mount/break on the front. Can meet anywhere from Salem to Eugene. Thanks for...
  20. jerhine23

    Atheris 6.5 grendel 18 inch sell or trade to ar optics such as mro or aimpoint pro

      1. For Sale
      2. For Trade
    • $450
    • Milwaukie
    • Oregon
    Atheris 6.5 grendel 18 inch , guaranteed sub moa by manufacturer. Bought it few months ago, only 50 rounds down the pipe. Still looks like, just dusty.. With scope - $520 Without scope - $450
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