Sig Sauer MCX Rattler LT – Pistol, 300 BLK, 6.75", Black (WPMCX-300B-6B-LT)
The MCX Rattler LT pistol is SIG’s ultra-compact 300 AAC Blackout platform with a 6.75-inch cold-hammer-forged barrel, short-stroke gas-piston operating system, fully ambidextrous controls, SIG QD suppressor-ready flash hider, and a SIG flat-blade match trigger. This SKU is the pistol configuration in black anodized finish, optic-ready, with one 30-round polymer magazine. Weight is approximately 92.8 ounces (5.8 lb). SIG part number WPMCX-300B-6B-LT, UPC 798681683260.
This listing is for the pistol only.
6.75" CHF Barrel, 300 BLK
Chambered in 300 AAC Blackout with a 1:5 twist and 5/8×24 tapered-shoulder threads under the SIG QD / suppressor-ready flash hider. The cold-hammer-forged barrel and adjustable gas system are built for both suppressed and unsuppressed use.
Ambidextrous Controls & Match Trigger
- Fully ambidextrous controls, including bolt catch/release
- SIG Flat Blade Match trigger
- M-LOK / Picatinny handguard interface
- Optic ready upper (no iron sights / no optic included)
Sig Sauer MCX Rattler LT Pistol Specifications
| Manufacturer | Sig Sauer |
| Model | MCX Rattler LT Pistol |
| Part Number | WPMCX-300B-6B-LT |
| UPC | 798681683260 |
| Firearm Type | Pistol |
| Cartridge | 300 AAC Blackout |
| Action | Semi-Automatic, short-stroke piston |
| Barrel Length | 6.75" cold hammer forged |
| Twist Rate | 1:5 |
| Muzzle Threads | 5/8×24, tapered shoulder |
| Muzzle Device | SIG QD suppressor-ready flash hider |
| Capacity | 30 rounds |
| Magazines Included | (1) 30-round polymer |
| Receiver Finish | Black anodized |
| Trigger | SIG Flat Blade Match |
| Sights | Optic ready |
| Weight | approximately 92.8 ounces (5.8 lb) |
What’s in the Box
- Sig Sauer MCX Rattler LT pistol
- (1) 30-round polymer magazine
Frequently Asked Questions
Is this a pistol?
Yes. This listing is the pistol configuration only.
What caliber and barrel length?
300 AAC Blackout with a 6.75-inch cold-hammer-forged barrel.
Does it include a magazine?
Yes — one 30-round polymer magazine.
Is it optic ready?
Yes. Irons / optic are not included with this SKU.
Internal Reference:
WPMCX-300B-6B-LT
Barcode:
798681683260
| Brand: Sig Sauer |
| Model: MCX, MCX SPEAR LT, Rattler LT |
| Caliber: .300 Blackout |
| Capacity: 30 |
| Firearm Action: Semi-auto |
| Barrel Length: 6" - 16", 7" |
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This item cannot be shipped to the following locations due to legal or carrier restrictions:
Restriction Details
This product cannot be sold or shipped to your location due to magazine capacity restrictions. Magazine capacity cannot exceed 10rd. If you believe this to be incorrect or if you're exempt from the restriction, please contact us at 636-791-1655.
Affected States/Territories (10):
Restriction Details
Colorado prohibits magazines with a capacity exceeding 15rd. If you believe this is in error or if you are exempt from the restriction, please contact us at 636-791-1655.
Affected States/Territories (1):
Restriction Details
Vermont restricts handgun magazine capacity to 15rd. This exceeds the state's restricted capacity. If you believe this is in error or if you are exempt from the restriction, please contact us at 636-791-1655.
Vermont restricts rifle magazine capacity to 10rd. This exceeds the state's restricted capacity. If you believe this is in error or if you are exempt from the restriction, please contact us at 636-791-1655.