SIG Sauer MCX Rattler LT .300 AAC Blackout with Dead Air Nomad 30 Suppressor, 6.75 in Barrel, Adjustable Magpul Stock
This SIG Sauer MCX Rattler LT is a short, .300 AAC Blackout configuration built around a 6.75 in barrel and a short-stroke gas piston system designed for suppressed use. It comes outfitted with a Dead Air Nomad 30 suppressor, an AR-style receiver extension, and a Magpul adjustable carbine stock. The rifle features a multi-position adjustable gas block, ambidextrous controls, and a free-float aluminum M-LOK handguard with a continuous 12 o'clock Picatinny rail. An NFA trust engraving reading "ECB TRUST, ALPHARETTA, GA." is present inside the trigger guard.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Condition: Good - Clean, well-maintained, minor wear marks.
Specific Condition Notes: The firearm is in great shape with scratches and blemishes present, and the bore is clean and shiny. There are many spots of blemishing on the top-facing Picatinny rail. The Dead Air Nomad 30 suppressor is in great shape with scratches and blemishes, including marks from previous removals. The baffles are intact, and minor carbon buildup is present.
What’s Included
- Dead Air Nomad 30 suppressor (installed)
- 1x 30-round Magpul PMAG for .300 BLK (Gen M3)
- No case included
The MCX Rattler LT architecture pairs a compact 6.75 in barrel with a short-stroke gas piston system and a multi-position adjustable gas block. The 1:5 twist rate is suited to the .300 AAC Blackout chambering, and the barrel is threaded to accept the included suppressor.
The included Dead Air Nomad 30 suppressor is mounted and ready for use with this platform. This configuration aligns with the Rattler LT's design intent for suppressed operation and compact handling in .300 BLK.
Controls are fully ambidextrous, including the safety and charging handle, with the LT family ambi bolt catch/release. The free-float aluminum M-LOK handguard provides accessory mounting, and the continuous 12 o'clock Picatinny rail runs along the top for alignment with mounted accessories.
This example uses the rear receiver 1913 hinge block with an installed AR-style receiver extension and a Magpul adjustable carbine stock. Length of pull is noted at 11–14.5 in, and the receiver is aluminum for durability with reduced weight.
It ships with a 30-round Magpul PMAG specifically marked for .300 BLK ("7.62x35" / "PMAG 30 AR 300 B") and has a 30+1 capacity. Markings include "SIG MCX MULTI-CALIBER" and "RATTLER." The MCX Rattler platform is tied to the USSOCOM PDW selection context.