BMP-23

Development and requirement

Bulgarian designers used the locally produced 2S1 self-propelled howitzer chassis as the basis for a national infantry fighting vehicle, gaining more internal space than the BMP-1 layout. ¹

BMP-23 is a Bulgarian infantry fighting vehicle whose retained lineage runs through the 2S1 artillery chassis and the wider MT-LB automotive family. That is different from assuming that it was merely a Soviet BMP-1 with another gun. Chassis ancestry explains where parts of the automotive concept came from; the troop compartment and weapons installation explain the resulting vehicle’s role. A borrowed artillery lineage does not make the completed BMP-23 a self-propelled howitzer, just as the BMP name alone does not establish component identity with every Soviet BMP. ¹

A European Defence Agency technical annex identifies BMP-23 and BMP-30 as Bulgarian-developed amphibious infantry fighting vehicles. That institutional description supports the national-development boundary used here without requiring the vehicle to inherit a Soviet BMP-1 specification simply because the names and roles are similar. ²

Design, protection, and mobility

The BMP-23 combines a tracked troop compartment with a 23 mm cannon and antitank missile capability. Its larger hull and different automotive ancestry distinguish it from the superficially similar Soviet BMP family. ¹

The tracked layout of the BMP-23 emphasizes cross-country mobility and the ability to remain with armored formations away from improved roads. Tracks spread vehicle weight over a larger contact area and help negotiate soft ground, broken surfaces, and obstacles, but they bring higher maintenance demand and more mechanical wear than an equivalent wheeled carrier. For crews and infantry, this means mobility is inseparable from sustainment: track condition, suspension components, fuel, recovery support, and route selection all affect whether the vehicle can deliver its combat function when required. The design is therefore a compromise between tactical mobility and the logistical cost of preserving that mobility over time. ¹

Protection and internal volume are especially difficult problems in an infantry fighting vehicle because the hull must serve both a vehicle crew and a dismounted fighting element. The troop compartment needs usable space, access routes, ammunition stowage, communications, and enough separation from fuel and mechanical systems to make the vehicle practical in repeated operations. Adding armor improves resistance to fragments and direct fire, but it also increases weight and can reduce mobility, amphibious margin, payload, or growth capacity. As threats change, many IFV modernization programs therefore become exercises in managing accumulated weight and electrical demand as much as in fitting a new gun or sight. ¹

Firepower and battlefield role

The BMP-23 description centers on a 23 mm automatic cannon and an antitank missile capability on a troop-carrying chassis. Those are features of the infantry-fighting configuration, not evidence that it retained the weapon of its 2S1 automotive ancestor. The precise cannon, missile and sight fits still need variant-specific documentation. Their calibers alone cannot establish the crew’s observation equipment, ammunition arrangement or the effect of later changes. This profile therefore keeps the broad inherited armament description without treating it as a fully reconciled technical specification. ¹

Service, variants, and modernization

The vehicle entered Bulgarian service during the late Cold War and remained a specialized national platform rather than a widely exported family. ¹

The BMP-23’s service history needs to be built around identifiable Bulgarian units and configurations. A national design described as long-serving may have received repairs or modifications without those changes defining a new fleet-wide standard. Conversely, a displayed or proposed variation is not evidence of an operational conversion program. The cited sources establish the Bulgarian family identity but do not document the sequence of production batches, accepted variants and later service changes. Those records are needed before expanding the brief service account into specific operational claims. ¹

Operational evidence is also available: U.S. Army Europe and Africa documented BMP-23 vehicles from Bulgaria's 3rd Battalion, 61st Mechanized Infantry Brigade rehearsing at Novo Selo Training Range on 27 May 2021 during Saber Guardian 21. This establishes continuing Bulgarian unit use at that date; it does not establish the size or readiness of the entire fleet. ³

How the vehicle fits the formation

In combined-arms employment, the BMP-23 is not an independent substitute for tanks, infantry, artillery, engineers, or air defense. Its purpose is to connect protected mobility with the infantry's ability to seize and hold ground. The mounted crew can observe and engage while the dismounted element deals with terrain and threats that cannot be solved from inside the hull. Effective use therefore depends on coordination: tanks provide heavier direct fire and protection, artillery and mortars suppress or isolate, engineers open routes, and the infantry fighting vehicle moves soldiers while contributing its own sensors and weapons. The platform is most effective when those capabilities overlap rather than when it is sent forward alone. ¹

Strengths, limitations, and family boundaries

Because the chassis descends from an artillery platform, lineage is cross-role; classification follows the BMP-23’s actual troop-carrying combat mission, so it belongs with IFVs. ¹

The unusual feature of BMP-23’s lineage is the reuse of an artillery-related automotive platform for an infantry mission. That relationship is worth preserving because it explains why exterior similarity to a Soviet BMP can be misleading. The resulting vehicle must be evaluated through its own troop accommodation and fighting equipment. Claims that it automatically gained a particular protection or mobility advantage from the larger hull would require comparative evidence not established by the cited evidence. National industrial continuity and the completed vehicle’s actual configuration are the firmer starting points.¹

Family names can also obscure important differences. The recorded lineage relationship is Derived from 2S1 / MT-LB automotive family. A common hull or manufacturer does not mean every derivative belongs in the same operational category. Command posts, mortar carriers, antitank vehicles, recovery vehicles, reconnaissance versions, air-defense systems, and direct-fire variants may share engines and running gear while performing fundamentally different tasks. For that reason the Armor Archive keeps the BMP-23 tied to its lineage but classifies individual branches by what they actually do on the battlefield. That approach preserves engineering relationships without turning one successful chassis into an all-purpose label that hides the history of the specialized vehicles built from it. ¹

Sources and further reading

References and further reading are listed below. Image identification, credit and reuse terms remain with each photograph.

1. BMP-23 reference overview
2. European Defence Agency — Central and Eastern Europe defence-industry technical annex
3. U.S. Army Europe and Africa — Bulgarian BMP-23s during Saber Guardian 21

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