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MCXPremium

Sig Sauer

Sig MCX Rattler LT 6.75"

Lightweight 6.75" Rattler with aluminum construction

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Key Highlights

  • Lighter weight than standard Rattler
  • Balanced .300BLK platform

Specifications

Price
$2,749
Weight
5 lb 15 oz
Calibers
.300 AAC Blackout
Rail Type
mlok
Best For
vehicle opshome defenserange training

Capability Profile

0-10 Scale Across 8 Axes

Compatibility Tags

family: ar-patterninterface: picatinny-tophandguard: mlokbarrel: ultra-compact

Overview

The Sig MCX Rattler LT was originally created to meet the demands of the U.S. Special Operations community for an ultra-compact personal defense weapon that doesn't compromise on capability. The 6.75-inch barrel configuration in .300 Blackout creates one of the most compact centerfire rifle platforms available at just 17.1 inches with the stock folded. The "LT" designation indicates this is the lighter, more modular evolution of the original Rattler, featuring compatibility with all MCX-Spear LT parts for easy barrel and handguard swaps.

The heart of the Rattler LT is its short-stroke gas piston system with adjustable gas settings for optimized performance with or without a suppressor. The 1:5 twist barrel is optimized for heavy subsonic .300 Blackout projectiles, making this platform exceptionally effective when suppressed. The cold-hammer-forged barrel maintains the quality standards of larger MCX variants while the free-floating M-LOK handguard provides mounting options despite the compact size. The two-stage match trigger, fully ambidextrous controls, and PDW-style upper receiver make this a complete package ready for serious use.

Despite its diminutive size, the Rattler LT is a serious fighting tool designed for special operations use. The adjustable gas system ensures reliable function across the full spectrum of .300 Blackout loads from supersonic defensive ammunition to subsonic suppressed rounds. The platform has been adopted by specialized units requiring maximum firepower in minimum space - from executive protection details to vehicle operators. At 5.1 pounds and 17.1 inches folded, the Rattler LT proves that extreme compactness doesn't require sacrificing Sig's legendary reliability and build quality.

Key Features

  • 6.75" cold-hammer-forged barrel optimized for .300 Blackout
  • Ultra-compact 17.1 inches with stock folded
  • Adjustable short-stroke gas piston for suppressed/unsuppressed use
  • 1:5 twist rate optimized for heavy subsonic projectiles
  • Two-stage match trigger for precise shot placement
  • Fully ambidextrous controls including bolt catch and release
  • Compatible with all MCX-Spear LT barrels and handguards
  • QD Clutchlok muzzle device for quick suppressor attachment

Pros

  • +Extremely compact design ideal for vehicle use and confined spaces
  • +Excellent reliability with both supersonic and subsonic ammunition
  • +Adjustable gas system optimized for suppressor use
  • +Modular design allows caliber and barrel length conversions
  • +Professional-grade quality meets special operations requirements
  • +Minimal gas blowback when running suppressed

Cons

  • Significant muzzle blast and concussion, suppressor essential
  • Premium pricing reflects special operations pedigree
  • Short barrel limits effective range compared to full-size rifles
  • .300 Blackout ammunition more expensive than 5.56 NATO
  • Requires SBR tax stamp unless configured as pistol

Detailed Specifications

caliber
.300 Blackout
Barrel Length
6.75 inches
Overall Length
17.1" folded / ~24" extended
weight
5.1 lbs
Gas System
short-stroke piston, adjustable
Twist Rate
1:5
barrel
Cold-hammer-forged carbon steel
handguard
M-LOK free-float PDW style
trigger
Two-stage match
stock
Folding PDW brace/stock
msrp
$2,500-2,700

Compatible Components

+54 more

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