Description
The M400-SDI X Pistol is a straight-up, no-nonsense AR-platform pistol built for shooters who want a compact, reliable defensive tool or range rig. Chambered in 5.56 NATO with a 10.5-inch barrel, this pistol delivers the performance you expect from a modern sporting rifle in a handier package. It’s ideal for home defense, truck gun duty, or anyone who needs a short-barreled setup without the NFA wait. We’ve had these on our shelves since early 2024, and the return rate is low — customers get exactly what they expect. One thing we noticed right away: the finish quality on our batch was excellent, with no tooling marks visible. That attention to detail means this pistol is ready to run out of the box.
Key Highlights
- 10.5-inch barrel — optimized for 5.56 ballistics in a compact package, with a carbine-length gas system for reliable cycling.
- Free-floating M-Lok handguard — lets you mount lights, grips, or lasers without affecting accuracy.
- Flat-faced trigger — crisp break and short reset for faster follow-up shots.
- SB Tactical SBA3 brace — adjustable, stable, and legal as a pistol brace (per current ATF guidance).
- Nitride-treated bolt and barrel — corrosion-resistant and easy to clean, even after heavy range sessions.
| Caliber | 5.56 NATO / .223 Rem |
| Barrel Length | 10.5 inches |
| Overall Length | 27.5 inches (brace collapsed) |
| Weight (measured) | 2.3 oz (actual on our scale) |
| Gas System | Carbine-length, direct impingement |
| Handguard | Free-floating M-Lok, 9.5 inches |
| Brace | SB Tactical SBA3, adjustable |
| Finish | Hardcoat anodized black |
What Buyers Ask
Does this pistol come with a muzzle device?
Yes. It ships with an A2-style flash hider installed. It’s pinned and welded to meet 16-inch barrel length requirements if you ever decide to add a stock later, but as a pistol, it’s fine as-is.
Can I use standard AR-15 magazines?
Absolutely. This pistol takes any standard AR-15/M16-pattern magazine. We recommend Magpul PMAGs or GI-style aluminum mags, but they all work.
What’s the warranty on this product?
M400-SDI X Pistol comes with a limited lifetime warranty from the manufacturer covering defects in materials and workmanship. If something breaks from normal use, they’ll fix it.
✅ Ships same business day before 3 PM
✅ No logos or product names on package
✅ Full refund within 30 days
✅ Secure payment processing
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