Daniel Defense
Daniel Defense M4A1 FSP Upper Receiver Group 14.5"
Classic 14.5" M4A1 configuration with pinned front sight post and quad rail.
Quick Specs
- Price
- $1,506
- Weight
- 4 lb 9.3 oz
- Brand
- Daniel Defense
- Category
- upper
Features
- •5.56 NATO
- •14.5" CHF barrel (16" P&W)
- •Carbine gas
- •Quad rail handguard
- •Pinned front sight post
Capability Boosts
Recommended For
Compatibility Tags
Overview
The Daniel Defense M4A1 FSP Upper Receiver Group delivers the classic M4A1 configuration with a pinned front sight post (FSP) and traditional quad rail handguard. This setup mirrors the standard US military M4A1 configuration, providing co-witnessed iron sights and proven reliability that has served armed forces worldwide.
The 14.5" cold hammer forged barrel features a Surefire SF3P muzzle device pinned and welded to achieve 16" overall barrel length for non-NFA compliance. The carbine-length gas system with pinned front sight gas block provides the rugged reliability expected from military-pattern rifles. The quad rail handguard offers Picatinny rails at all four positions for maximum accessory mounting flexibility.
This configuration is ideal for shooters who prefer the classic military aesthetic and want backup iron sights without additional mounting hardware. The FSP serves as a robust, zero-retaining front sight that has proven itself in combat conditions worldwide.
Key Features
- ✓Cold hammer forged 14.5" barrel (16" with P&W Surefire SF3P)
- ✓M4 barrel profile, chrome lined, HP/MPI tested
- ✓Pinned front sight post with A2-style construction
- ✓Quad rail handguard with full Picatinny coverage
- ✓Carbine-length gas system
- ✓Surefire SF3P flash hider, pinned and welded
- ✓M16 profile BCG and charging handle included
Pros
- +Classic M4A1 military configuration
- +Pinned FSP provides robust, zero-retaining front sight
- +NFA-exempt with 16" OAL
- +Surefire SF3P is suppressor-compatible
- +Complete package with BCG and charging handle
- +Quad rail offers maximum mounting flexibility
Cons
- −FSP limits low-mount optic options
- −Heavier than low-profile gas block configurations
- −Quad rail adds weight vs. M-LOK alternatives
- −Pinned muzzle device limits suppressor mounting options
- −Classic configuration may not suit modern preferences
Detailed Specifications
- caliber
- 5.56x45mm NATO
- barrelLength
- 14.5" (16" with P&W muzzle device)
- barrelProfile
- M4
- barrelMaterial
- 4140 Chrome Moly Vanadium
- barrelFinish
- Chrome Lined, Anodized
- twist
- 1:7
- gasSystem
- Carbine Length, Direct Impingement
- gasBlock
- Pinned Front Sight Post (FSP)
- handguard
- 14.5" Quad Rail, Picatinny
- upperReceiver
- 7075-T6 Aluminum, Anodized
- bcg
- MIL-SPEC, Included
- chargingHandle
- MIL-SPEC, Included
- muzzleDevice
- Surefire SF3P, Pinned & Welded
- threadPitch
- 1/2x28
- weight
- 4.58 lbs
- madeIn
- USA
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Add the Daniel Defense M4A1 FSP Upper Receiver Group 14.5" to your build and see how it enhances your platform.