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sig mcx

The SIG MCX is a family of firearms designed and manufactured by SIG Sauer, produced in both selective fire and semi-automatic only models, and features a short-stroke gas piston system, which is inherited from the earlier SIG MPX submachine gun. The MCX is available in rifle, carbine, short-barreled rifle, and pistol (generally considered as a compact carbine without buttstock) configurations.

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Recent contents
  1. S

    11.5 Sig MCX 5.56 Upper w/ AR Conversion Kit

      1. For Sale
    • $1200
    • Pullman
    • Washington
    For who might be interested, I have a brand new, never fired Sig MCX 11.5" 5.56 upper. Includes a conversion kit to run on a standard AR lower, giving you full MCX functionality without needing a dedicated MCX lower. I'm asking $1200 OBO. Not looking for any trades on this. Let me know if you...
  2. ktzdaman

    Sig MCX Virtus 300blk setup!

      1. For Sale
    • $3000
    • Hillsboro
    • Oregon
    Kind of a cool creation i built - Sig Mcx Virtus (started life as a 556). Saw around 500 rounds. Radian charging handle. Geissle trigger Magpul grip Strike bolt lever advance Brand new sig cross stock Silencerco asr muzzle break Midwest industries 15" suppressor size handgaurd New from Sig 16"...
  3. wingman33

    Sig MCX Rattler 5.5" 5.56

      1. For Trade
    • Beaverton
    • Oregon
    Got a Sig Rattler 5.5 kit on a Sharps Bros Hellbreaker lower for trade. Got it to be a cheaper to shoot trainer set up for the 5.5 blackout but sig pulled the rug out from under me & discontinued it before I could get one. Went to the 9" Virtus instead so this one goes. 160rnds down the pipe...
  4. K

    Sig MCX Stock / Spear LT FDE

      1. For Sale
    • $150
    • Bellevue
    • Washington
    Hi, parting out my Spear LT stock that came with a Sig direct build kit. It is an OEM MCX stock, brand new but without the packaging. FDE new in wrapper. I visit the Portland area regularly, if you are interested in seeing either of the stocks please feel free to reach out. Thanks.
  5. Zoolander

    New 16" Sig MCX Virtus handguard gray

      1. For Sale
    • $100
    • Tigard
    • Oregon
    New takeoff
  6. K

    *Update price Sig MCX Virtus upper

      1. For Sale
      2. For Trade
    • $900
    • Bellevue
    • Washington
    Hi selling my Sig Mcx Virtus upper. 16inch in 556. Has seen limited use (3 times to the range) so maybe a 200 rounds down the pipe. Excellent condition, only selling since this is a spare sitting around collecting dust. This is a complete upper, so BCG and changing handle are inlcluded. I can...
  7. S

    Sig Sauer MCX Virtus Patrol

      1. For Sale
    • $1650
    • Keizer
    • Oregon
    Selling my Sig MCX Virtus (gen 2), has low round count (~200). Asking $1650 obo Will ship, not interested in trades.
  8. FarmMech

    Sig mcx 300 blk barrel + 480 RDS ammo

      1. For Sale
    • $500
    • Aurora
    • Oregon
    Sig mcx Barrell with gas piston 300 black out Gen 1 I have been told but I haven't been able to find out barrel differences (I know there is hard gaurds 480 + RDS of ammo (one partial box) $500 for all. 450 for Barrell alone 250 for ammo Pick up in Aurora
  9. P

    SIG .300 blk upper

      1. For Sale
    • $1200
    • Beaverton
    • Oregon
    new in box complete SIG 300 blk upper with receiver plug to add folding stock. $1350- now $1200! picked up in Beaverton no trades please
  10. K

    New Sig Spear LT upper in 556

      1. For Sale
    • $1350
    • Bellevue
    • Washington
    Hi up for sale is a new Sig Spear Lt upper. -16" -556 Brand new never fired. Complete upper, just need to add the Mcx buffer less stock adapter to any milspec AR lower.
  11. K

    Black Sig Spear LT 16" Upper 5.56

      1. For Sale
    • $1350
    • Bellevue
    • Washington
    Brand new Black Sig Spear LT 16" Upper in 5.56. Love this platform, but need the funds for another project. Complete upper, just needs the Sig adapter to bolt on to a mil spec AR lower. Thanks for your interest.
  12. C

    Sig MCX with Spear LT Stock

      1. For Sale
    • $1600
    • Portland
    • Oregon
    Sig MCX, 16" barrel in 5.56 rifle. I just upgraded this month to the new Spear LT folding/telescopic stock, which was $250. Round count is under 100, all unsuppressed. It is like new condition and I'm the original owner. I wasn't planning on selling this but looking to fund new project. It is...
  13. wscott202

    Sig MCX Canebrake w extras

      1. For Sale
    • $2350
    • Kalispell
    • Montana
    MINT Sig MCX Canebrake, new Romeo MSR on scalarworks mount, Inforce light, extra grip, can include Sig magnifier for an extra hundred, will include faux suppressor (not suppressor pictured) Selling to refinance property 2350 (gun alone is 2600 new)
  14. K

    Sig Mcx Virtus (upper only) Trades added

      1. For Sale
      2. For Trade
    • $900
    • Bellevue
    • Washington
    Hi selling my Sig Mcx Virtus upper. Has seen limited use (3 times to the range) so maybe a 200 rounds down the pipe. Excellent condition, only selling since this is a spare sitting around collecting dust. I can possibly meet in the Portland area if needed. 16" in 5.56 New 12" handguard. for...
  15. K

    Sig MCX 5 56 Rattler Upper

      1. For Sale
      2. For Trade
    • $800
    • Bellevue
    • Washington
    Hi, selling my mint condition Sig Rattler in 5.56. 5.5 inch barrel. Complete upper, ready to mount to your milspec lower. Less than 150 rounds down the pipe, and in excellent Thanks for looking. May be interested in trades, plus cash. Looking for a Glock 47 optics ready, and 9mm/55.6 range ammo.
  16. M

    SIG MCX Virtus PCP .22 Air Rifle

      1. For Sale
    • $250
    • Hillsboro
    • Oregon
    Hey all. This needs to go to a good home where it will actually see some plinking. I thought it was cool, bought direct from Scheel's and put maybe 50 pellets through it. Would feel comfortable calling this as close to like new as possible. Only thing I'll say is I installed some Daniel Defense...
  17. KUFCIS

    Sig mcx canebreak pistol

      1. For Sale
    • $2000
    • Estacada
    • Oregon
    NEW UNFIRED MCX CANEBREAK PISTOL. Comes w-factory box, 1 mag, lock & booklet. Removed the faux silencer & handgaurd & Installed new sig flash hider & midway short handgaurd. Also comes w-new collapsing SB pistol brace & 480 rds new ammo (see pics). Buyer must pass/pay for background chk. Willing...
  18. ivanthebear

    SIG MCX 9" 300 BLK barrel

      1. For Sale
    • $350
    • Vancouver
    • Washington
    Hello, I have for sale a SIG MCX 9" 300 Blackout barrel - $350 No rounds through the pipe. Picked up a 6" for my build instead. Open to trades for lights, quad rail handguards, etc (let me know what you have). Thanks!
  19. BigStick

    Mantis Blackbeard X (for Sig MCX)

      1. For Sale
    • $175
    • Newberg
    • Oregon
    Brand new, sealed in box, Mantis X Blackbeard for the Sig MCX. Auto-resetting trigger laser training system. Goes for $319 on their website. Selling for $219. Price drop to $200. Another price drop to $175 I live in Newberg and work in Tualatin and will drive 10-20 minutes to meet up.
  20. notgarandthumb

    SIG MCX - SPEAR LT 13 INCH COYOTE HANDGUARD

      1. For Sale
    • $175
    • Newberg
    • Oregon
    Factory replacement 13" handguard for the SIG MCX-SPEAR LT. Color: Coyote Tan. I took it off a new rifle, it's in great shape. Open to offers!
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