Long Description

The AT-100 Long Dart is a 100-millimeter high-velocity anti-armor gun system designed to solve a narrow but persistent problem: defeating contemporary armored threats at extended range without escalating caliber, logistics burden, or crew complexity.

The weapon uses a 100 mm × 1100 mm cartridge, paired with an L/65 barrel. This long bore length is not stylistic excess; it exists to extract maximum work from propellant gases while keeping chamber pressures within predictable limits. The result is a muzzle velocity of approximately 1,675 meters per second—high enough to favor kinetic penetration physics rather than chemical reliance. Velocity, in this design, is treated as reliability.

Two barrel configurations exist. Version 1 employs conventional rifling, optimized for early development rounds and transitional doctrine. Version 2 adopts a smoothbore, selected after test data demonstrated superior consistency with long-rod penetrators and reduced wear at sustained firing rates. The smoothbore is not an upgrade in prestige; it is an admission that stabilization by fin is more tolerant of manufacturing variance than stabilization by spin at these velocities.

“Long Dart” is a literal description. The system is built around elongated sub-caliber penetrators, not explosive mass. Lethality is achieved through sectional density and retained velocity, not blast. This simplifies ammunition handling, storage safety, and lifecycle cost, while aligning with THRC’s preference for predictable terminal behavior over spectacular effects.

Development began internally in late 1976, under the assumption that armor would improve faster than battlefield survivability systems. That assumption proved conservative. The weapon entered service in 1979 at a unit cost of approximately 35,000 Credits—intentionally set near parity with existing medium-caliber systems to discourage procurement hesitation. One Credit equals one U.S. dollar, a conversion chosen to remove abstraction from budgeting and force accountability.

Overview

Name : AT-100 Long Dart
Place of Origin : THRC
Type : Field Gun / Anti-Tank Gun
In Service : 1979 – Present
Designed : 1976 – 1979
Operator : THRC Ground Forces and THRC Fortificator
Manufacturer : BlackGearCompany (THRC)
Designer : BlackGearCompany Applied Ballistics Division
Unit Cost : 35,000 Credits (1 Credit = 1 USD)

Specifications

Caliber : 100 mm
Cartridge : 100 × 1100 mm
Barrel Length : L/65
Barrel Type :
– Version 1 : Rifled
– Version 2 : Smoothbore

Muzzle Velocity : ~1,675 m/s
Primary Ammunition :
– APFSDS
– HEAT-FS

Secondary Ammunition :
– HE-Frag-FS
– HE-FS

Mass (combat) : ~3,046 kg
Length : 9.1 m
Width : 3.0 m
Height : 1.1 m

Mounting : Towed field carriage
Traverse / Elevation : Manual-assisted [20° left and right/ -9° to +20°]
Crew : 8

Shell in Box

Man holding shell

Export Availability: Confirmed

Unit Price (AT-100 System):

35,000 Credits per unit
Applicable for orders of 100–999 units
30,000 Credits per unit
Applicable for bulk orders of 1,000–9,999 units

Barrel Configuration (select at order):

Rifled
Smoothbore

Ammunition Pricing (per round):

APHECBC — 1,000 Credits
HE-Frag — 750 Credits
HESH — 1,200 Credits
APFSDS — 2,000 Credits
HEAT-FS — 1,500 Credits
HE-Frag-FS — 500 Credits
HE-FS — 500 Credits