Heighth Defense HGM825: The Shroudless Springfield Echelon PDW Chassis Deep Dive (2026)

Last updated: June 4, 2026 · Originally published: June 5, 2026

Heighth Defense: Built by Echelon Owners, for Echelon Owners

What Is the Heighth Defense HGM825?

Heighth Defense HGM825 Key Features and Specs

Heighth Defense HGM825 FAQ

What is the Heighth Defense HGM825?

It is a shroudless PDW grip module (chassis) for the Springfield Echelon. The Echelon’s serialized COG drops in with no modifications, creating an 11.25-inch PDW-style platform with an auto-indexing mag release, ambidextrous gas pedals, and a direct low-mount optic rail. MSRP is $360, made in the USA.

Does the HGM825 work with suppressors and comped barrels?

Yes — that is the point of the shroudless design. It accepts 4.0″ and 4.5″ Echelon barrels in standard, threaded, comped, ported, or suppressed configurations, with suppressors up to 1.35″ in diameter (larger with a 1″ barrel extension).

Do I need a tax stamp to put a stock on the HGM825?

Attaching a stock creates a short-barreled rifle, which requires an approved ATF Form 1 first. As of January 1, 2026 the $200 NFA making tax has been eliminated, but the approval process still applies. Without a stock, the module alone is not a firearm and is not NFA-regulated.

Which Echelon magazines work with the Heighth Defense HGM825?

Full-size 17- and 20-round Echelon magazines. The 4.0 compact’s 15-round magazines will not work, and the module includes a built-in spare magazine holder.

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