Date: 25/5/2020 11:38
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SIG Sauer MCX CO2 Rifle + Dot Sight, Black

3.08 reviews

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1-year limited warranty



List Price $269.95


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Estimated in-stock date 05-26-20
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  • WARNING This product
    WARNING This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to
  • SIG Sauer MCX Rifle
  • Uses an 88- or 90-gram CO2 cartridge
  • Semiauto
  • Rifled steel barrel
  • 30rd Roto Belt pellet magazine
  • Adjustable flip-up front sight
  • Adjustable flip-up rear sight
  • Synthetic stock
  • Metal housing
  • Weaver/Picatinny optics rail
  • Removable tactical foregrip
  • Manual safety
  • Life-tested with 15,000 shots
  • Includes SIG 20R red dot sight with integral mount
  • Available to US customers exclusively

.177 caliber velocities Our tech department provided this shot string, which was done with 5.25 grain match ballistic alloy pellets:

Shot 1: 428.11 fps Shot 2: 513.51 fps Shot 3: 493.59 fps Shot 4: 489.98 fps Shot 5: 499.75 fps Shot 6: 492.83 fps Shot 7: 497.49 fps Shot 8: 497.08 fps Shot 9: 474.27 fps High: 513.51 Low: 428.11 Average: 487.40 fps

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other products by SIG Sauer

Caliber.177" (4.5mm)
Max Velocity700 fps
Barrel Length17.7"
Overall Length34.7"
Shot Capacity30
Front SightFlip-up, adjustable
Rear SightFlip-up, adjustable
Suggested forPlinking/Fun
Body TypeRifle

other products by SIG Sauer

Average Customer Review

3.0 (8 reviews)
2 star

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3.0 3.0

3.0 3.0

4.0 4.0

By Christopher from USA on 2018-09-28
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0.00 ratings

Things I liked: Pretty accurate. Feels great. Sig Sauer support.

Things I would have changed: Better reliability.

What others should know: Had mine for about 8 months when it stopped working. Maybe had 250 rounds through it? Contacted PA. They told me to contact Sig as it was still under warranty. I did so and Sig was GREAT. Emailed me a prepaid fed ex return label. It took about 4-6 weeks and now I have it back. They replaced it with a new one....not repaired. Hoping this one lasts longer than the first.....perhaps the new ones have the bugs worked out.


1.0 1.0

3.0 3.0

5.0 5.0

By John l from USA on 2018-08-17
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Verified Purchase

Things I liked: Its great when it works or not defective. 3 returns and can not seem to get one that functions for more than a weekend

Things I would have changed: The quality

What others should know: The Pyramid Air returns are awesome


4.0 4.0

4.0 4.0

5.0 5.0

By Rich from USA on 2018-06-13
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Verified Purchase

Things I liked: Stock up on pellets! Only had the thing for an hour or so and already emptied a tin. I ended up getting the venturi tank for it because I hate CO2, especially hated the idea of having to get the 88 or 90 gram tanks. Anyway, I was almost really disappointed at first. I unboxed the gun, pumped up the tank, loaded a couple mags (definitely order a spare mag as well), and took her outside to sling some lead. First shot = no problem, second shot = problem. Long story short, I had to rack the charging handle after every shot for the first couple mags. Came in and tried to find some troubleshooting tips online. All I can find were people that had similar issues, but no solutions. Not ready to give up on it quite yet, I loaded a couple more mags and headed back out, and by some miracle its functioned flawlessly ever since. No clue what the issue was or how it resolved itself. I dont know if it was the gun or the reg/valve on the venturi tank. All I know is that it works now.

Things I would have changed: I wish sig would make their own PCP version instead of having to get the venturi tank. The venturi adds some substantial length of pull. I'm 6'1" with a decent wing span and it's a little long with the tank mounted. It'll do for what it is, wouldn't accept it with my standard AR's though.

What others should know: This thing isn't meant for hunting. When shooting lead (not alloy) it definitely wont get near the listed FPS. That's ok though! It's meant to be a trainer/plinker and it's perfect for that role. While we're on the subject, I definitely would not waste the money on the alloy pellets just to gain some FPS. You're going to go through a lot of pellets really fast! Save some coin and just get basic lead wadcutters. Almost forgot another good point. This thing is surprisingly accurate! So kudos to Sig in that regard. Overall, is it perfect? No. A lot of fun? Yes. A few tweaks and Sig could REALLY be onto something here.

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  • Sailesh from USA asked:

    What battery for the red dot sight?

    • tugsjjhgfdd from Canada asked:

      Does this ship to Canada?

      • Tyler from USA:

        Not at this time

    • Stephen from USA asked:

      Can I use any style of .177 pellet with my mcx?

      See all discussions

      Item Description

      SIG-A-MCX177RDB [PY-3719-7144]

      30rd Roto Belt mag, semiauto, SIG 20R red dot sight + mount. (AIR-MCX-MRD-177-88G-30-BLK)

      Caliber.177" (4.5mm)
      Max Velocity700 fps

      This product is out of stock.
      Estimated in-stock date 05-26-2020.
      Place your order now for delivery priority!

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