
Availability: In Stock
Current Stock: Out of stock
The Sig Sauer MCX 5.56 NATO rifle with a 7.75" barrel brings compact, modular firepower to shooters who need serious capability without sacrificing control or ergonomics. Built on the proven MCX platform, this 30-round rifle combines a cold hammer-forged barrel with fully ambidextrous controls—bolt catch, bolt release, and safety—making it equally at home in either hand. The adjustable gas piston system runs cleanly whether you're shooting suppressed or unsuppressed, and the SIG QD suppressor-ready flash hider is already threaded and installed, so you can add a can whenever you're ready.
What sets this rifle apart is its modularity. The barrel and handguard are fully compatible with all MCX barrels and handguards, so you can reconfigure your setup to match your mission without replacing the entire lower. The flat-blade trigger delivers the precision and control you'd expect from a Sig, giving you clean, predictable breaks whether you're running drills at 25 yards or stretching shots at distance. The 7.75" barrel strikes a practical balance between velocity and maneuverability—short enough to handle tight spaces and vehicle work, long enough to unlock the potential of the 5.56 round.
This is a rifle built for shooters who understand their tools. It handles suppressors, it adapts to different roles, and every control is where you need it regardless of your firing hand. Whether you're training, competing, or working, the MCX 5.56 delivers versatility without compromise.
| Caliber | 5.56 NATO |
| Barrel Length | 7.75 inches |
| Barrel Type | Cold hammer-forged |
| Magazine Capacity | 30 rounds |
| Finish | Black |
| Gas System | Adjustable gas piston |
| Trigger | SIG flat-blade |
| Flash Hider | SIG QD suppressor-ready |
| Controls | Fully ambidextrous |
Yes. The MCX 5.56 is fully compatible with all MCX barrels and handguards, making it a genuinely modular platform. You can swap components to reconfigure the rifle for different roles and preferences.
Yes. The adjustable gas piston is tuned for both suppressed and unsuppressed operation, and the rifle comes equipped with a SIG QD suppressor-ready flash hider so you can attach a suppressor directly.
The bolt catch, bolt release, and safety are all fully ambidextrous, making the rifle equally functional for left- and right-handed shooters without modification.
The rifle ships with the SIG QD suppressor-ready flash hider already installed and a 30-round magazine. Specific additional accessories included with your purchase should be confirmed at the time of order.


SKU: 125476453 • Width: 11.5in • Height: 4.2in • Depth: 46.5in • Weight: 9.5oz




Availability: In Stock
Current Stock: Out of stock
The Sig Sauer MCX 5.56 NATO rifle with a 7.75" barrel brings compact, modular firepower to shooters who need serious capability without sacrificing control or ergonomics. Built on the proven MCX platform, this 30-round rifle combines a cold hammer-forged barrel with fully ambidextrous controls—bolt catch, bolt release, and safety—making it equally at home in either hand. The adjustable gas piston system runs cleanly whether you're shooting suppressed or unsuppressed, and the SIG QD suppressor-ready flash hider is already threaded and installed, so you can add a can whenever you're ready.
What sets this rifle apart is its modularity. The barrel and handguard are fully compatible with all MCX barrels and handguards, so you can reconfigure your setup to match your mission without replacing the entire lower. The flat-blade trigger delivers the precision and control you'd expect from a Sig, giving you clean, predictable breaks whether you're running drills at 25 yards or stretching shots at distance. The 7.75" barrel strikes a practical balance between velocity and maneuverability—short enough to handle tight spaces and vehicle work, long enough to unlock the potential of the 5.56 round.
This is a rifle built for shooters who understand their tools. It handles suppressors, it adapts to different roles, and every control is where you need it regardless of your firing hand. Whether you're training, competing, or working, the MCX 5.56 delivers versatility without compromise.
| Caliber | 5.56 NATO |
| Barrel Length | 7.75 inches |
| Barrel Type | Cold hammer-forged |
| Magazine Capacity | 30 rounds |
| Finish | Black |
| Gas System | Adjustable gas piston |
| Trigger | SIG flat-blade |
| Flash Hider | SIG QD suppressor-ready |
| Controls | Fully ambidextrous |
Yes. The MCX 5.56 is fully compatible with all MCX barrels and handguards, making it a genuinely modular platform. You can swap components to reconfigure the rifle for different roles and preferences.
Yes. The adjustable gas piston is tuned for both suppressed and unsuppressed operation, and the rifle comes equipped with a SIG QD suppressor-ready flash hider so you can attach a suppressor directly.
The bolt catch, bolt release, and safety are all fully ambidextrous, making the rifle equally functional for left- and right-handed shooters without modification.
The rifle ships with the SIG QD suppressor-ready flash hider already installed and a 30-round magazine. Specific additional accessories included with your purchase should be confirmed at the time of order.
SKU: 125476453 • Width: 11.5in • Height: 4.2in • Depth: 46.5in • Weight: 9.5oz

