diff --git a/ace_advanced_ballistics.dll b/ace_advanced_ballistics.dll
index 41e0533991..a35dcbd2da 100644
Binary files a/ace_advanced_ballistics.dll and b/ace_advanced_ballistics.dll differ
diff --git a/extensions/CMakeLists.txt b/extensions/CMakeLists.txt
index 299a9f4a5b..c152ce1e21 100644
--- a/extensions/CMakeLists.txt
+++ b/extensions/CMakeLists.txt
@@ -89,8 +89,8 @@ endif()
 
 string(TIMESTAMP ACE_BUILDSTAMP "%Y-%m-%dT%H:%M:%SZ")
 set(ACE_VERSION_MAJOR 3)
-set(ACE_VERSION_MINOR 2)
-set(ACE_VERSION_REVISION 0)
+set(ACE_VERSION_MINOR 4)
+set(ACE_VERSION_REVISION 1)
 EXECUTE_PROCESS(COMMAND git rev-parse --verify HEAD
     OUTPUT_VARIABLE T_ACE_VERSION_BUILD
     OUTPUT_STRIP_TRAILING_WHITESPACE
diff --git a/extensions/advanced_ballistics/AdvancedBallistics.cpp b/extensions/advanced_ballistics/AdvancedBallistics.cpp
index 203243cd9d..fe39f69c39 100644
--- a/extensions/advanced_ballistics/AdvancedBallistics.cpp
+++ b/extensions/advanced_ballistics/AdvancedBallistics.cpp
@@ -5,6 +5,11 @@
 #include <unordered_map>
 #include <random>
 
+//Guard for M_PI ???? ref https://github.com/acemod/ACE3/pull/2382
+#ifndef M_PI
+    #define M_PI 3.14159265358979323846f
+#endif
+
 #define GRAVITY 9.80665f
 #define ABSOLUTE_ZERO_IN_CELSIUS -273.15f
 #define KELVIN(t) (t - ABSOLUTE_ZERO_IN_CELSIUS)
@@ -572,8 +577,8 @@ void __stdcall RVExtension(char *output, int outputSize, const char *function)
             positionOffset[1] += cos(bulletDir + M_PI / 2) * horizontalDeflectionPartial;
         }
 
-        double centripetalAccel = 2 * 0.0000729 * (bulletDatabase[index].muzzleVelocity / -32.2) * cos(bulletDatabase[index].latitude) * sin(bulletDir);
-        velocityOffset[2] -= centripetalAccel * deltaT;
+        double centripetalAccel = 2 * 0.0000729 * (bulletDatabase[index].muzzleVelocity) * cos(bulletDatabase[index].latitude) * sin(bulletDir);
+        velocityOffset[2] += centripetalAccel * deltaT;
 
         double spinDrift = bulletDatabase[index].twistDirection * 0.0254 * 1.25 * (bulletDatabase[index].stabilityFactor + 1.2) * pow(TOF, 1.83);
         double spinDriftPartial = spinDrift - bulletDatabase[index].spinDrift;