When the US Special Operations Command put out a request for a Personal Defense Weapon (PDW) to replace the MP5, Sig Sauer responded with the MCX Rattler; an absolutely groundbreaking short barrel rifle. The Rattler is based on Sig Sauer’s flagship MCX modular rifle, featuring its short-stroke recoil gas piston operating system. What separates Sig Sauer’s MCX platform from other AR/M4 style rifles is the recoil system that totally eliminates the need for a buffertube, making the MCX Rattler more compact than any AR/M4 rifle ever produced. The MCX Rattler PSB (pistol version) has a length of 19.3 inches when arm brace is collapsed and the MCX Rattler SBR has a length of only 16 inches when the stock is folded; both versions of the MCX weigh under 6 lbs. The rifle is currently chambered in .300 BLK features a 5.5 inch suppressor ready barrel and a aluminum free-floated handgaurd with M-LOK attachment points.
Additional Features and Information
Hammer forged carbon steel barrel and three pronged flash hider
Features the Sig Enhanced Trigger
Ambidextrous AR-style controls and dual-paddle bolt-release
M1913 rail from charging handle to muzzle
Two position gas regulator for suppressed or unsuppressed fire
3 position telescoping arm brace (PSB) or folding stock (SBR)
Additional Features and Information
Hammer forged carbon steel barrel and three pronged flash hider
Features the Sig Enhanced Trigger
Ambidextrous AR-style controls and dual-paddle bolt-release
M1913 rail from charging handle to muzzle
Two position gas regulator for suppressed or unsuppressed fire
3 position telescoping arm brace (PSB) or folding stock (SBR)
Caliber: .300 Blackout
Weight: 5.1 lbs w/ magazine
Rifle Overall Length: 19.3″
Action: Gas Piston – Semi-Automatic
Trigger: Sig Enhanced
Safety: AR Selector Switch
Rifle Barrel Length: 5.5″
Rifle Barrel Twist: 1:5
Rifle Stock: Pistol Brace
Scope Mount: Picatinny Rail
Magazines Included: (1) 30 Round
Iron Sights No
Caliber or Gauge: .300 BLK
Handedness Right Hand
Frequently Asked Questions – Sig MCX Rattler Pistol .300 Black Out 5.5" Barrel M-Lok Handguard Sig Sauer
- How fast does this ship?
- Ships in 1‑3 business days to your licensed D.C. FFL dealer after purchase and registration.
- Do I need registration?
- Yes. DC requires firearm registration, including a mandatory 10‑day waiting period after purchase approval from MPD before pickup. Handguns require registration, magazines <=10 rounds.
- Is this legal in D.C.?
- Yes, provided it complies with D.C. law (registered, no assault features, magazine ≤10 rounds).
- Is the Sig MCX Rattler Pistol .300 Black Out 5.5" Barrel M-Lok Handguard Sig Sauer suitable for me?
- This Sig MCX Rattler Pistol .300 Black Out 5.5" Barrel M-Lok Handguard Sig Sauer is popular for uses like guns.
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