SIG MCX- RATTLER LT 6.75" .300BLK SBR

The SIG SAUER MCX Rattler LT SBR in .300 Blackout is compact, configurable, and downright mean—built to run suppressed and stay nimble in close quarters. With its 6.75" cold hammer-forged barrel and short-stroke gas piston system, the Rattler LT is made to squeeze every bit of performance out of .300BLK while keeping recoil in check. It’s got all the bells and whistles you’d expect from SIG’s MCX platform—ambi controls, M-LOK handguard, folding stock—and it’s ready to ride in your truck, pack, or range bag. If you’re looking for a silencer-ready, fight-ready SBR that doesn’t waste space or energy, the Rattler LT .300BLK is it.

FEATURES AND BENEFITS OF THE MCX RATTLER:

• 6.75" Cold Hammer-Forged Barrel: Short and sweet, made for precision with .300 Blackout.
• Suppressor-Optimized Gas System: Adjustable short-stroke piston keeps things smooth and quiet.
• Fully Ambi Setup: Safety, mag release, bolt catch—all mirrored for any shooter.
• Modular & Mission-Ready: M-LOK handguard and folding, adjustable stock make it easy to kit out your way.
• Built to Run Quiet: Designed from the jump to pair perfectly with your favorite can.

TECHNICAL SPECIFICATIONS:

• Caliber: 300BLK
• Barrel Length: 6.75"
• Mags: (1) 30rd Polymer Mag
• Trigger: SIG Flatblade Match
• Twist: 1:5 in
• Overall Length: 24.9"
• Weight: 5.8 lb

WHAT'S IN THE BOX:

• Sig Sauer MCX Rattler-LT .300BLK SBR
• (1) 30rd Polymer Mag
• Owners Manual

HOW TO BUY THE SIG MCX RATTLER-LT WITH SILENCER SHOP:

1. Add the MCX RATTLER to your cart. Make sure to include a tax stamp for each item and a Single Shot Trust if applicable. The Single Shot Trust makes it easy to add friends and family as additional users of the suppressor.
2. Head to your selected Powered By Silencer Shop dealer with a kiosk to complete your demographic and fingerprint scan in just five minutes. Snap a selfie and upload it online within your customer portal with the Silencer Shop app.
3. Silencer Shop will email an electronic document to you. Please review and digitally sign the file from your computer or mobile device.
4. Set up your ATF eForms account at eforms.atf.gov. Make sure your email, name, and address match your Silencer Shop profile information exactly.
5. You'll receive an email from Silencer Shop that says "Ready to Certify" and includes the phone number of your local Powered by Silencer Shop dealer. Set up a time to certify with your dealer and submit the form to the ATF for processing.