SI GRIDLOK Gen 3 — 15" M-lok Quick-Detach CNC Metal Handguard in Black

Look, the SI GRIDLOK 15-inch is the rail you want if you’re running a rifle-length setup and you’re tired of wobbly, plastic handguards that flex when you mount a grip or a light. It’s a full metal, 15-inch M-LOK rail with a quick-detach clamp system — flip the lever, slide it off, done. No tools, no stripped screws, no drama.

What is the SI GRIDLOK 15"?

It’s a CNC aluminum handguard for airsoft and gel blaster use, anodized black, with a full-length Picatinny top rail and M-LOK slots running the full length on the sides and bottom. The 15-inch length gives you maximum real estate for lights, grips, bipods, suppressor mounts, whatever your build needs. If you’re running a 14.5" or 16" outer barrel, this is the handguard that actually fills the space without looking stubby.

Why run this over other rails

• Quick detach actually works. The clamp lever locks down tight, never had it shift during a game, and pull the whole rail off in two seconds for battery swaps or cleaning.
• Full metal, not pot metal. It’s got weight to it (in a good way). You feel the difference immediately compared to stock nylon handguards. Takes drops, knocks, and door frames without cracking.
• 15" gives you options. Short rails look awkward on rifle-length builds. This one stretches all the way out, gives you a long grip surface, and balances the front of a heavy M4 nicely.
• M-LOK + Picatinny hybrid. Top rail for optics and iron sights, M-LOK everywhere else for a clean, lightweight mount. No need for bulky rail covers.

Questions people actually ask

Will this fit my gel blaster M4?

If you’ve got a standard M4/M16 receiver with a delta ring or standard gas block setup, yes. It fits Jinming, CYMA, and most TM-spec AEG builds straight out of the box. If you’re running some weird proprietary receiver, you might need to file a tiny bit, but 95% of the time it drops right on.

How much does it weigh?

Around 300–350g depending on the batch. It’s heavier than a nylon handguard, but that’s the point — the weight sits at the front and steadies your aim. If you’re building a super lightweight speedsoft gun, maybe look at a 8.5" instead. This is for rifle builds.

Can I mount a foregrip, flashlight, or suppressor?

Absolutely. The M-LOK slots take any standard M-LOK accessory — angled grips, vertical grips, weapon lights, PEQ boxes, suppressor mounts. The top rail is full Picatinny for optics or flip-up sights. I’ve got a foregrip and a tracer unit mounted on mine with zero issues.

Specs

Bottom line

If you’re building a rifle-length M4 gel blaster and you want a handguard that looks the part, feels solid, and actually lets you mount accessories without wobble, this is it. The quick detach alone is worth the price — being able to strip your rail off in seconds for cleaning or battery changes is a game changer. I’ve run this in probably a dozen games now and it’s still tight, still straight, still zero play. Grab one before they sell out again.

Note: This is a toy-model accessory for gel blaster and airsoft use only. Not for real firearms. Minor fitting may be required on non-standard receivers. Color and finish may vary slightly by production batch.