Igniter Tube

Hypervelocity Armour Piercing Tracer

Type Classification:

STD MSR 02787001 (M392A2). STD OTCM 38116 dtd 1961 (M392).


This cartridge is a hypervelocity armor-piercing type with discarding sabot, intended for use in 105mm guns against armored targets.


The projectile consists of a sheathed tungsten carbide core with tracer and a sabot. The core, which is the armor-piercing element, is carried within the sheath with the sabot assembled on the exterior surface. A plastic band is positioned on the outside diameter of the sabot at the forward end. A fiber rotating band and a rubber obturator are assembled on the outside diameter near the base of the sabot. The igniter tube of the electric primer extends almost the entire length of the propellant loosely packed in the cartridge case.


The electrically initiated primer ignites the propelling charge. Gases produced by the burning propellant propel the projectile from the gun and ignite the tracer which burns for a minimum of 2.5 seconds. Setback, centrifugal, and air pressure forces cause the sabot to discard upon leaving the gun tube. The sheathed core is spin stabilized and penetrates the target solely by kinetic energy.

Difference Between Models:

The M392 is of United Kingdom manufacture and bears the U.K. designation of L36A1. The M392 is fitted with U.K. L4A1 or L4A2 primer.

Tabulated Data:

Complete round:


Body material -------------------Tungsten carbide core

Color ------------------------------- Black w/white marking




Temperature limits: Firing:


Lower limit-------------------- -80°F (for period not more than 3 days)

Upper limit -------------------- +160°F (for period not more than 4 hr/day)

*Packing ----------------------------- 1 round per fiber container; 2 containers per wooden box

*Packing box: Weight ----------------------------- 126 lb

8-23/32 in. Cube------------------------------- 2.8 cu ft

* NOTE: See DOD Consolidated Ammunition Catalog for complete packing data including NSN's.

Shipping and Storage Data:

Storage compatibility group--- C

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