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Sig Sauer MCX Rattler PCB
Sig Sauer MCX Rattler PCB

Sig Sauer MCX Rattler PCB .300 BLK

  • Compact
  • Lightweight
  • Good ergonomics
  • Trouble cycling subsonic ammo without a suppressor
  • Expensive
Editor’s Note:

“Designed for rapid deployment from concealment, the MCX Rattler packs a punch in the .300 BLK configuration. Coming in at 5.1 pounds empty, sporting a 5.5-inch barrel and folded length of 17 inches, the MCX Rattler is definitely compact enough to be carried anywhere.” – Joshua Fox

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Product Details

Action
Semi-Auto
Barrel Length
5.5in
Magazine Capacity
30rd
Caliber
300 AAC Blackout
Overall Length
29.3in
Price
$2,599.99

Product Features

30+1 capacity
Free-float M-LOK handguard
Ambidextrous safety and magazine release
Adjustable gas piston
Folding brace
QD sling points

By The Numbers

Accuracy
The 5.5-inch barrel on an AR Pistol isn’t designed to be the most accurate gun in your safe. But it can be very accurate under 50 yards with some proper shooting fundamentals.
Reliability
Supersonic ammo works great. We encountered multiple failures when trying to shoot subsonic ammo unsuppressed.
Customization
Most standard AR-15 modifications will work here, just be mindful of vertical grips and stocks since these are considered pistols.
Ergonomics
The brace can be a awkward to shoulder, but ambi controls and a comfortable pistol grip help make the gun feel good in the hand.
Price
$2,599.99

Hands-on Reviews and Related Posts

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The LWRC DI is one of the more affordable options for users who are looking for a fully ambidextrous high-end AR-15. These guns are duty ready and feature-rich at a competitive price point.

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final verdict

“The MCX Rattler is still an absolutely fantastic gun when shooting supersonic ammo. It is small, and concealable in any standard backpack. Not to mention, it packs a punch with a 30-round magazine that can reach out to a couple of hundred yards. Plus, it just looks really cool. Just make sure you pay attention to what ammunition you purchase and feed it if you are not running it suppressed.” – Joshua Fox

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