# Sig Sauer MCX Rattler Tactical Pistol .300 Blackout 5.5" - Black **Brand:** SIG Sauer **Category:** Bullpup Rifles **Caliber:** .300 AAC Blackout ## Specifications - **Caliber:** .300 AAC Blackout - **Barrel Length:** 5.5" - **Capacity:** 30 rounds - **Finish:** Black - **Weight:** 81.6 oz - **Overall Length:** 15.4" - **UPC:** 798681673179 - **SKU:** UCE3nOuEd ## Description The Sig Sauer MCX Rattler is a semi-automatic pistol chambered in .300 AAC Blackout with a 5.5-inch barrel, aluminum frame, and polymer grips. At 5.10 lbs and 23 inches overall (15.4 inches collapsed), it's one of the more compact 30-round .300 Blackout platforms available. ### Key Specifications - **Model:** MCX Rattler - **Caliber:** .300 AAC Blackout - **Action Type:** Semi-Auto - **Capacity:** 30+1 rounds - **Barrel Length:** 5.5 inches - **Overall Length (OAL):** 23 inches (15.4 inches collapsed) - **Weight:** 5.10 lbs - **Finish:** Black anodized - **Material:** Aluminum frame with polymer grips - **Safety Style:** Manual Thumb safety ### Detailed Features The optic-ready platform has no factory iron sights. It's designed for a red dot or compact optic to sit directly on the rail. The M-Lok free-float handguard reduces weight and provides multiple accessory mounting positions while helping manage heat during use. The aluminum receiver is durable without adding unnecessary mass. Manual thumb safety placement is accessible without breaking grip. The .300 AAC Blackout caliber accepts both subsonic and supersonic loads, which matters if you plan to run a suppressor. ### Target Audience The Rattler suits experienced shooters who specifically want a compact .300 Blackout pistol platform. The optic-ready setup and M-Lok handguard assume the buyer will configure the firearm to their preferences rather than run it factory-stock. ### Usage Scenarios - Home defense where the short OAL and 30-round capacity are practical priorities - Competitive shooting in formats allowing pistol-configured 300 Blackout - Suppressed shooting, where the .300 Blackout subsonic load option is the main attraction - Small to medium game hunting at shorter ranges where the caliber's terminal performance is sufficient ## Frequently Asked Questions **Q: What caliber is the MCX Rattler?** A: The MCX Rattler is chambered in .300 AAC Blackout. **Q: Who makes the MCX Rattler?** A: The MCX Rattler is made by Sig Sauer. **Q: What is the barrel length of the MCX Rattler?** A: It has a 5.5-inch barrel. **Q: How many rounds does the MCX Rattler hold?** A: It has a 30+1 capacity. **Q: What type of firearm is the MCX Rattler?** A: The MCX Rattler is a semi-automatic pistol. **Q: Is the MCX Rattler optic-ready?** A: Yes. The MCX Rattler ships without factory iron sights and is designed to accept a red dot or compact optic directly on the rail. **Q: Where can I buy the MCX Rattler?** A: Compare current vendor offers on this page. ## What Reviewers Say *Quoted verbatim from YouTube reviews. Each link opens the video at the moment quoted.* > That's actually nice like The Recoil I was expecting more with such a a piston gun with a short barrel. > > — [Honest Outlaw](https://www.youtube.com/watch?v=6hNfrCuLR9s&t=292s) > For how small this gun is, it shoots relatively the recoil is pretty negligible. > > — [Colion Noir](https://www.youtube.com/watch?v=fEF1CrXXrAA&t=210s) > It functioned well I agree I mean it's reliable it's accurate. > > — [Honest Outlaw](https://www.youtube.com/watch?v=6hNfrCuLR9s&t=937s) > It's expensive I think it's better than like a DI AR-15 chamber in 300 Blackout I think the MCX is much better. > > — [Honest Outlaw](https://www.youtube.com/watch?v=6hNfrCuLR9s&t=946s) > 3 Blackout certainly is a niche cartridge but I think for like a PDW I mean I really like this thing it's short it's fast. > > — [Honest Outlaw](https://www.youtube.com/watch?v=6hNfrCuLR9s&t=972s) ## What Customers Say *AI-generated insights from customer reviews* Owners of the MCX Rattler in .300 Blackout are generally satisfied with the platform, with the compact size and caliber versatility coming up most often as the reasons they bought it. The short overall length and light weight are consistently praised for making the firearm easy to handle in confined spaces. The .300 Blackout caliber gets specific appreciation. The ability to run both subsonic suppressed loads and supersonic defensive ammunition from the same platform is a practical advantage that owners mention frequently. Build quality tracks well with Sig Sauer's reputation. Owners report reliable cycling across different load types, and the ergonomics draw positive marks for intuitive controls. On the critical side: price is the most common complaint relative to competing compact platforms. Weight with accessories added can be more than some buyers expect from a pistol-format firearm. Recoil from some .300 Blackout loads in the short barrel is snappier than expected, supersonic loads in particular. Rattler-specific accessories can be harder to source and more expensive than equivalent parts for common AR-15 platforms. Customization is a frequent topic among owners who appreciate the modularity of the MCX system. ## Pricing **1 offers available** | Vendor | Price | |--------|-------| | Gunbuyer Com | $2499.99 | ## Similar Products - [SIG SAUER MCX Rattler LT .300 Blackout Tactical Pistol - Black](https://gunsnation.com/p/sig-sauer-mcx-rattler-lt-300-blackout-tactical-pistol-black/UCE3nP19L) - [Sig Sauer MCX Rattler Canebrake .300 BLK Tactical Pistol 5.5"](https://gunsnation.com/p/sig-sauer-mcx-rattler-canebrake-300-blk-tactical-pistol-5-5/UCE3nOuEM) - [Sig Sauer MCX Rattler .300 AAC Blackout Tactical Pistol](https://gunsnation.com/p/sig-sauer-mcx-rattler-300-aac-blackout-tactical-pistol/UCE3nOWKo) - [Sig Sauer MCX Rattler Tactical 5.56mm Optic-Ready Pistol](https://gunsnation.com/p/sig-sauer-mcx-rattler-tactical-5-56mm-optic-ready-pistol/UCE3nOuEr) - [Sig Sauer MCX Rattler Canebrake - Compact Tactical .300 Blackout](https://gunsnation.com/p/sig-sauer-mcx-rattler-canebrake-compact-tactical-300-blackout/UCE3nOark) - [Sig Sauer MCX Rattler .300 AAC Blackout 5.5in Black](https://gunsnation.com/p/sig-sauer-mcx-rattler-300-aac-blackout-5-5in-black/UCE3nOWKv) --- *Data from [GunsNation](https://gunsnation.com)*