Forward Controls Design Ar-15/M4 Receiver Extension

The Forward Controls Design AR-15/M4 receiver extension is a 6-position carbine extension built for shooters who demand reliability over flash. This isn't a redesign for the sake of being different—it's a thoughtfully engineered receiver extension that addresses real-world durability and usability challenges faced by serious rifle builders and operators. Made from 7075 aluminum with rolled threads and dry film lubed interior, the FCD receiver extension delivers the dependability you need whether you're setting up a duty rifle, precision build, or tactical carbine.

What sets this receiver extension apart is its attention to practical details. Three strategically positioned drain holes—two additional openings in the 2nd and 5th latch positions plus the standard TDP-spec end drain hole—allow water and debris to evacuate quickly from inside the extension. For rifles that see field use, this level of drainage prevents moisture buildup that can compromise bolt carrier function. The laser-engraved stock latch position indicators on both sides (at 3 and 9 o'clock) solve a real problem: they remain visible and accurate regardless of which premium stock you run, whether it's a Magpul, Vltor, or open-top M4-style stock. This side-positioning approach works because many modern stocks lack the top-mounted release lever hole that would make top engraving impractical.

The FCD receiver extension ships in Cerakote Black and is proudly manufactured in the USA. At six positions, it provides solid adjustment range for length-of-pull without the complexity of nine-position variants. The design philosophy here is unmistakable: every feature serves a function, and nothing is included simply for aesthetics. If you're building an AR or replacing a worn extension on a duty weapon, this is the kind of part that works harder the more demanding your use becomes.

Key Features

• Three drain holes (standard position plus two additional) for superior water evacuation and debris shedding
• Laser-engraved latch position indicators on both sides for quick visual confirmation
• 7075 aluminum construction with rolled threads for durability and reliable fitment
• Dry film lubricated interior for smooth operation
• Six latch positions for adjustable length of pull
• Cerakote Black finish for corrosion resistance
• Made in the USA

Specifications

Product Type	Carbine Receiver Extension
Compatibility	AR-15/M4 (standard carbine; NOT A5 compatible)
Material	7075 Aluminum
Thread Type	Rolled
Latch Positions	6
Finish	Cerakote Black
Drain Holes	3 (positions: 2nd, 5th, and end of extension)
Made	USA

Frequently Asked Questions

Is this receiver extension compatible with A5 stocks?

No. The Forward Controls Design receiver extension is a standard carbine receiver extension and is not A5 compatible. It works with standard AR-15/M4 carbine stocks.

What stocks will work with this extension?

This extension is compatible with standard carbine-length AR stocks, including Colt M4 stocks, SOPMOD stocks, Magpul stocks, Vltor carbine stocks, and other standard carbine-length designs. The side-mounted latch position indicators remain visible with any of these stocks.

Why does this extension have three drain holes instead of one?

The two additional drain holes (in the 2nd and 5th latch positions) work alongside the standard TDP-spec end drain hole to provide faster and more effective water and debris drainage from inside the extension. This feature is especially valuable for rifles used in wet or field conditions.

What finish does it come in?

The Forward Controls Design receiver extension is finished in Cerakote Black.