Daniel Defense M4A1 Complete Upper — 5.56 NATO, 14.5" Pinned (16" OAL) | FSP RIS Rail, Carbine Gas, SureFire SF3P Flash Hider, M16 BCG | Flat Dark Earth / Black | 23-004-09376 | UPC 818773021869

Build your duty-grade carbine from the top down with the Daniel Defense M4A1 Complete Upper Receiver. Chambered in 5.56 NATO, this premium upper pairs a 14.5" barrel with a permanently pinned muzzle device for a legal 16" overall barrel length (OAL), then layers on field-proven components: the M4A1 FSP Rail Interface System (RIS) surrounding a fixed front sight base, a reliable carbine-length gas system, a factory-installed SureFire SF3P flash hider, and an M16-profile bolt carrier group. Finished in a distinctive two-tone Flat Dark Earth and Black anodized scheme, it’s a rugged, optics-ready foundation for defensive use, training, and hard range days.

Why Choose the Daniel Defense M4A1 Upper?

• Mission-ready spec: A proven 5.56 NATO upper with 14.5" barrel pinned/welded to 16" OAL, combining compact handling with compliance-minded length.

• M4A1 FSP RIS handguard: The Front Sight Post-compatible Rail Interface System gives you quad-rail mounting around a standard FSB—perfect for white lights, lasers, grips, switches, and sling hardware.

• SureFire SF3P flash hider (factory-installed): Three-prong design helps disrupt muzzle flash and is a trusted host interface for select SureFire devices.

• Carbine-length gas system: Time-tested reliability across a wide range of ammunition, from training bulk to duty loads.

• M16-profile bolt carrier group: Full-mass carrier enhances dwell and durability; staked gas key and quality internals for long service life.

• Two-tone anodized finish: FDE/Black complements most duty accessories and resists corrosion and abrasion.

• Complete and ready: Ships as a complete upper—just add your preferred charging handle, sights/optic, and a compatible AR-15 lower.

Key Features at a Glance

• Caliber: 5.56 NATO (also accepts .223 Rem)

• Barrel Length: 14.5", pinned/welded to 16" OAL

• Handguard: Daniel Defense M4A1 FSP Rail Interface System (quad rail, FSB cut)

• Gas System: Carbine length

• Muzzle Device: SureFire SF3P flash hider (pinned/welded)

• BCG: M16 profile bolt carrier group included

• Finish: Anodized FDE & Black

• Upper Type: Complete, optics-ready with Picatinny top rail

• Model / SKU: 23-004-09376

• UPC: 818773021869

Note: Pinned/welded muzzle device is permanent to achieve a 16" OAL. Always verify local laws and any additional requirements before making configuration changes.

Built for Real-World Performance

• Accuracy you can trust: Cold-hammer-forged barrels and rigid rail/receiver interfaces are hallmarks of Daniel Defense—ideal for zero retention with lasers and LPVOs.

• Heat & accessory management: Quad rail layout with generous venting supports cable routing, pressure pads, and rail covers while maintaining durability.

• Consistent cycling: Carbine gas + properly tuned porting deliver dependable ejection patterns and bolt hold-open.

• Long-service components: Proper fastener staking, quality coatings, and tight machining tolerances help this upper run cleanly over high round counts.

Ideal Applications

• Home & property defense: Add a red dot or LPVO, light, and sling for a dependable defensive upper.

• Training & carbine classes: Proven reliability for high-round-count courses and hard use.

• Law enforcement / security (where approved): Known, supported component ecosystem and accessory compatibility.

• General-purpose carbine builds: The classic FSP + quad-rail layout remains relevant for modern setups.

Setup Recommendations

• Optics: Red dot + magnifier for CQB to mid-range, or a 1–6x / 1–8x LPVO for a do-it-all solution.

• Sling: Two-point adjustable sling attached near the FSB and rear receiver for stable transitions.

• Light & switch: Rail-mount a compact white light; route pressure pads on the RIS with clips/panels.

• Charging handle: Ambidextrous handle improves manipulations around optics and gear.

• Rail covers / panels: Add heat shields and texture where your support hand rides.

Specifications (Quick Reference)

• Upper Receiver: Flat-top, Picatinny

• Barrel: 14.5" 5.56 NATO, pinned/welded to 16" OAL; threaded under device

• Muzzle Device: SureFire SF3P (pinned)

• Gas System: Carbine length

• Handguard: M4A1 FSP RIS (quad-rail, FSB cut)

• BCG: M16-profile, complete

• Finish: FDE/Black anodized

• Model: 23-004-09376

• UPC: 818773021869

What’s in the Box

• Daniel Defense M4A1 Complete Upper Receiver Assembly

• M16-profile BCG (installed)

• SureFire SF3P (pinned/welded)

• M4A1 FSP RIS handguard installed

• (Charging handle and sights/optic typically not included—check your retailer’s package content.)

FAQs

Q: Is the muzzle device removable?
A: No—the SF3P is pinned/welded to achieve 16" OAL. Any changes require professional gunsmithing and legal compliance.

Q: Will this fit my AR-15 lower?
A: Fits most mil-spec AR-15 lowers. Ensure buffer, spring, and trigger are in good working order for best reliability.

Q: What gas system length is used?
A: Carbine-length gas—widely supported and highly reliable.

Q: Can I mount a suppressor?
A: The SF3P serves as a host interface for select SureFire suppressors. Confirm model compatibility and comply with all federal, state, and local laws.

Q: Does it include iron sights?
A: Typically no. Add your preferred BUIS or optic to the Picatinny upper rail and RIS.

Compliance & Safety

• Know your laws: Barrel length and muzzle device regulations vary by jurisdiction. This upper is configured to 16" OAL via a pinned/welded device; confirm your local rules.

• Safe assembly: Follow torque specs, use quality mounting hardware, and perform a full function check before live fire.

SEO-Friendly Highlights (Naturally Woven)

Daniel Defense M4A1 complete upper, 5.56 NATO, 14.5" pinned (16" OAL), M4A1 FSP RIS quad rail, carbine-length gas system, SureFire SF3P flash hider, M16 BCG, FDE/Black anodized, model 23-004-09376, UPC 818773021869, duty-grade AR-15 upper, optics-ready quad rail upper.

Meta for Your Product Page

Meta Title: Daniel Defense M4A1 Complete Upper — 5.56, 14.5" Pinned (16" OAL), FSP RIS, SF3P, M16 BCG | 23-004-09376
Meta Description: Build on a proven foundation with the Daniel Defense M4A1 complete upper: 5.56 NATO, 14.5" barrel pinned to 16" OAL, M4A1 FSP RIS, carbine gas, SureFire SF3P, M16-profile BCG, FDE/Black. Model 23-004-09376 — UPC 818773021869.

Own the classic quad-rail, FSP-forward fighting upper—Daniel Defense M4A1—and get the rugged reliability, accessory flexibility, and compliance-minded 16" OAL your build deserves.

The End