diff --git a/files/fallout2.cfg b/files/fallout2.cfg
index a22d64be..407a9b05 100644
--- a/files/fallout2.cfg
+++ b/files/fallout2.cfg
@@ -110,6 +110,8 @@ iface_bar_mode=0
 iface_bar_side_art=2
 iface_bar_sides_ori=0
 iface_bar_width=800
+;Set to 1 to use the HRP-style alternate ammo metre in the HP/AC cluster.
+ALTERNATE_AMMO_METRE=0
 ;Whether to load EDG files (HRP format) when loading maps. If loaded, they override default edge clipping and scroll blocking behavior.
 edg_support=1
 ignore_map_edges=0
diff --git a/src/interface.cc b/src/interface.cc
index 3e9da782..599fbba9 100644
--- a/src/interface.cc
+++ b/src/interface.cc
@@ -111,6 +111,14 @@ constexpr int kCustomIndicatorMaxCount = kCustomIndicatorMaxTag - kCustomIndicat
 constexpr int kCustomIndicatorDefaultCount = 5;
 constexpr int kCustomIndicatorTextLength = 19;
 constexpr int kCustomIndicatorTextBufferSize = kCustomIndicatorTextLength + 1;
+constexpr int kAmmoBarLeft = 463;
+constexpr int kAmmoBarTop = 26;
+constexpr int kAmmoBarMaxRatio = 70;
+constexpr int kAmmoAlternateMetreWidth = 5;
+constexpr unsigned char kAmmoAlternateMetreBorderColor = 0;
+constexpr unsigned char kAmmoAlternateMetreEmptyColor = 14;
+constexpr unsigned char kAmmoAlternateMetreFillColor = 196;
+constexpr unsigned char kAmmoAlternateMetreFillShadeColor = 14;
 
 struct CustomIndicatorDescription {
     bool isActive;
@@ -131,6 +139,8 @@ static int endTurnButtonFree();
 static int endCombatButtonInit();
 static int endCombatButtonFree();
 static void interfaceUpdateAmmoBar(int x, int ratio);
+static void interfaceUpdateAlternateAmmoMetre(int x, int ratio);
+static void interfaceUpdateAlternateAmmoMetreRow(unsigned char* dest, bool filled);
 static int _intface_item_reload();
 static void interfaceDrawActionButtonOverlay(unsigned char* data, int width, int height, int pitch, int upX, int upY, int darkenColor);
 static void interfaceRenderCounterAnimationStep(unsigned char* src, unsigned char* dest, int delayMs, Rect* numbersRect, bool refreshMouse);
@@ -1444,7 +1454,7 @@ int _intface_update_ammo_lights()
         }
     }
 
-    interfaceUpdateAmmoBar(463 + gInterfaceBarContentOffset, ratio);
+    interfaceUpdateAmmoBar(kAmmoBarLeft + gInterfaceBarContentOffset, ratio);
 
     return 0;
 }
@@ -2053,6 +2063,11 @@ static int endCombatButtonFree()
 // 0x460AA0 intface_draw_ammo_lights
 static void interfaceUpdateAmmoBar(int x, int ratio)
 {
+    if (settings.ui.alternate_ammo_metre) {
+        interfaceUpdateAlternateAmmoMetre(x, ratio);
+        return;
+    }
+
     if ((ratio & 1) != 0) {
         ratio -= 1;
     }
@@ -2084,6 +2099,42 @@ static void interfaceUpdateAmmoBar(int x, int ratio)
     }
 }
 
+static void interfaceUpdateAlternateAmmoMetre(int x, int ratio)
+{
+    if ((ratio & 1) != 0) {
+        ratio -= 1;
+    }
+
+    unsigned char* dest = gInterfaceWindowBuffer + gInterfaceBarWidth * kAmmoBarTop + x;
+    int firstActiveRow = kAmmoBarMaxRatio - ratio;
+
+    for (int row = 0; row <= kAmmoBarMaxRatio; row++) {
+        bool filled = row < kAmmoBarMaxRatio
+            && row >= firstActiveRow
+            && ((row - firstActiveRow) & 1) == 0;
+        interfaceUpdateAlternateAmmoMetreRow(dest, filled);
+        dest += gInterfaceBarWidth;
+    }
+
+    if (!gInterfaceBarInitialized) {
+        Rect rect;
+        rect.left = x;
+        rect.top = kAmmoBarTop;
+        rect.right = x + kAmmoAlternateMetreWidth - 1;
+        rect.bottom = kAmmoBarTop + kAmmoBarMaxRatio;
+        windowRefreshRect(gInterfaceBarWindow, &rect);
+    }
+}
+
+static void interfaceUpdateAlternateAmmoMetreRow(unsigned char* dest, bool filled)
+{
+    dest[0] = kAmmoAlternateMetreBorderColor;
+    dest[1] = filled ? kAmmoAlternateMetreFillColor : kAmmoAlternateMetreEmptyColor;
+    dest[2] = filled ? kAmmoAlternateMetreFillColor : kAmmoAlternateMetreEmptyColor;
+    dest[3] = filled ? kAmmoAlternateMetreFillShadeColor : kAmmoAlternateMetreEmptyColor;
+    dest[4] = kAmmoAlternateMetreBorderColor;
+}
+
 // 0x460B20 intface_item_reload
 static int _intface_item_reload()
 {
diff --git a/src/settings.cc b/src/settings.cc
index cec69950..93820d2f 100644
--- a/src/settings.cc
+++ b/src/settings.cc
@@ -113,6 +113,19 @@ void registerSetting(const char* section, const char* key, T& variable, P postPr
             } });
 }
 
+static void registerBoolSettingWithFallback(const char* section, const char* key, const char* fallbackKey, bool& variable)
+{
+    settingsRegistry.push_back(
+        { [&, section, key, fallbackKey]() {
+             settingsRead(section, fallbackKey, variable);
+             settingsRead(section, key, variable);
+         },
+            [&, section, key, fallbackKey](bool onlyAdd) {
+                if (onlyAdd && (settingsKeyExists(section, key) || settingsKeyExists(section, fallbackKey))) return;
+                settingsWrite(section, key, variable);
+            } });
+}
+
 // SECT must be defined to the settings sub-struct name, which equals the config section string.
 #define XSTR(x) #x
 #define STR(x) XSTR(x)
@@ -156,6 +169,7 @@ void initSettingsRegistry(bool isMapper)
     SETTING_P(iface_bar_width, clamp(640, 4320));
     SETTING_P(iface_bar_side_art, clamp(0, 999));
     SETTING(iface_bar_sides_ori);
+    registerBoolSettingWithFallback(STR(SECT), "ALTERNATE_AMMO_METRE", "alternate_ammo_meter", settings.ui.alternate_ammo_metre);
     SETTING_P(splash_screen_size, clamp(0, 2));
     SETTING(movie_aspect_fit);
     SETTING(edg_support);
diff --git a/src/settings.h b/src/settings.h
index 14f7f27a..b4fb5d54 100644
--- a/src/settings.h
+++ b/src/settings.h
@@ -59,6 +59,9 @@ struct UISettings {
     // Iface-bar side graphics extend from the Screen edges to the Iface-Bar if true (otherwise from bar to edges).
     bool iface_bar_sides_ori = false;
 
+    // Use HRP-style alternate ammo metre in the HP/AC cluster.
+    bool alternate_ammo_metre = false;
+
     // Extends AP bar to 16 dots instead of 10.
     bool extend_ap_bar = false;