AR15 5.56 Free Float RAS Mk12 Mod 1
$401.99 at Brownells · 3 stores
In stock
Mk4 10" Federal Super Modular Rail M-LOK DDC
Geissele Automatics · Rails & Handguards
No ratings yetBest price
$425.00at Brownells
In stock checked Oct 1, 2026
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| Brownells Best price | $425.00checked Oct 1, 2026 | In stock | Buy at Brownells | |
| OpticsPlanet | $425.00Salechecked Oct 1, 2026 | In stock | Buy at OpticsPlanet | |
| Ammunition Depot | $425.00checked Oct 1, 2026 | In stock | Buy at Ammunition Depot | |
| Battlehawk Armory | $351.08Salechecked Oct 1, 2026 | Check store | Buy at Battlehawk Armory | |
| Palmetto State Armory | $425.99checked Oct 1, 2026 | Check store | Buy at Palmetto State Armory |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
Price history
Lowest in-stock price in the last 30 days: $425.00 at Ammunition Depot. Dashed line = out of stock. Tracking since Sep 27, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Ammunition Depot | $425.00 | $425.00 | $425.00 |
| Battlehawk Armory | $351.08 | $351.08 | $351.08 |
| Brownells | $425.00 | $425.00 | $425.00 |
| OpticsPlanet | $425.00 | $425.00 | $425.00 |
| Palmetto State Armory | $425.99 | $425.99 | $425.99 |
Since Sep 27, 2026.
About this part
The Mk4 10" Federal Super Modular Rail M-LOK DDC is a 1E+1" AR-15 handguard from Geissele Automatics. It's sold by 5 stores (3 in stock), from $351.08 to $425.99. The lowest in-stock price in the last 30 days was $425.00 at Ammunition Depot.
Fits and works with
- Handguard length
- 1E+1" · Barrels
Specifications
- Manufacturer
- Geissele Automatics
- Platform
- AR-15
- Length
- 10"
- Attachment
- M-LOK
From the manufacturer
This is the same rail used to fullfill contracts for the Federal Bureau of Investigation (FBI). Its strength, modularity and M-Lok compatibility gives users the capabilities needed to successfully complete the mission at hand. These rails are purpose-built and feature integrated M1913 picatinny rail sections at the fore of the rail in the 3, 6 and 9 o'clock positions. The Picatinny rail on the bottom of the rail, or the 6 o'clock position, is elongated in this version to accommodate accessories more comfortably. Maximum venting for heat dissipation also dramatically reduces the rails overall weight, while maintaining its same strong and rigid platform. The MK4 M-LOK rail f Mfg: Geissele Automatics
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