Daniel Defense M4A1 FSP Rail Interface System II 12.25in 2-Piece Handguard Black DD-8030-BK
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Daniel Defense
Overview
The Daniel Defense M4A1 FSP Rail Interface System II is a 12.25-inch, free-float handguard designed to enhance accuracy by isolating the barrel from any pressure exerted during shooting. Constructed from durable 6061-T6 aluminum and finished with hardcoat anodizing, this handguard not only provides a robust platform for mounting accessories but also maintains a lightweight profile. This handguard is commonly found on builds that prioritize a balance of maneuverability and versatility, making it ideal for tactical and competitive shooting applications.
Specifications
Daniel Defense M4A1 FSP Rail Interface System II 12.25in 2-Piece Handguard Black DD-8030-BK
Build history on GunPartPicker
Builders on GunPartPicker first added the Daniel Defense M4A1 FSP Rail Interface System II 12.25in 2-Piece Handguard Black DD-8030-BK to a build in March 2026.
Availability is good: it was in stock at one retailer or another nearly every day in August 2026, and today all 6 retailers we track have it in stock. It dipped to $425.85 at Brownells for a stretch in August 2026, well under its usual $516 to $542, so sales do come around. Buying today, the lowest price is $516 at Primary Arms, above August's low of $425.85, so a better deal may come back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
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Builds Featuring This Part
See all 1 →Builds in the community that include the Daniel Defense M4A1 FSP Rail Interface System II 12.25in 2-Piece Handguard Black DD-8030-BK
| Build | Parts | Total |
|---|---|---|
 | 15 | $3279.95 |
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