Used SIG MCX 5.56 – FDE, Folding Stock, M-LOK Handguard (Multi-Caliber Receiver)
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EBERLESTOCK FADE SLING BAG CONSUMER PROMOTION
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October 15 through December 31, 2026
For a Limited Time: Buy a New P211, P320, M17 or M18 Handgun Between 10/15/2026 and 12/31/2026, Receive One (1) Allegiance Flag Supply 3' x 5' American Flag (SKU: MKT0678)
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EBERLESTOCK FADE SLING BAG CONSUMER PROMOTION
For a Limited Time: Buy a New P365 Handgun Between 10/15/2026 and 12/31/2026, Receive One (1) EBERLESTOCK Fade Sling Bag (SKU: PS9005602)
October 15 through December 31, 2026
Description
Only one available.
Built around SIG’s short-stroke piston system, this MCX is a premium, soft-shooting carbine configured in 5.56 NATO and finished in FDE. The multi-caliber receiver marking opens the door for caliber-change uppers and barrel kits, while the slim M-LOK handguard keeps weight forward of the balance point to a minimum. A 3-prong flash hider, full-length pic rail, and ambidextrous controls round out a feature set designed for fast handling and reliability.
This example shows the low-profile, right-side folding stock that locks up solid and keeps overall length compact for storage and transport. It also includes a vertical grip mounted to the M-LOK handguard (appears to be Daniel Defense branded) and a 30-rd PMAG. Overall finish presents as honest light handling with no abuse visible in the photos—exact round count unknown. If you’ve wanted a piston-driven MCX in a proven 5.56 setup, this one is turnkey and ready for your optic and sling.
Specs
| Specification | Detail |
|---|---|
| Manufacturer | SIG SAUER |
| Model / Family | MCX (multi-caliber marked receiver) |
| Caliber | 5.56 NATO (per hang tag) |
| Operating System | Short-stroke gas piston |
| Barrel | Carbine-length (exact length not confirmed from photos) |
| Muzzle Device | 3-prong flash hider (type not confirmed) |
| Handguard | Free-float M-LOK, full-length top rail |
| Stock | Right-side folding, low-profile skeleton style |
| Controls | Ambidextrous safety; ambi charging handle cut; bolt catch/release standard MCX pattern |
| Finish / Color | FDE receivers, matching furniture |
| Furniture | Textured FDE pistol grip; vertical grip on handguard |
| Magazine | Includes 30-rd PMAG (shown) |
| Condition (observed) | Very good; light handling wear |
| Included | Rifle as shown (no optic/sights included in photos) |
| Serial (visible) | 63J028822 (shown on tag) |
| Category | Modern carbine / tactical gear |
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