diff --git a/addons/jam/CfgMagazineWells.hpp b/addons/jam/CfgMagazineWells.hpp
index 8361e0987..3464eab0b 100644
--- a/addons/jam/CfgMagazineWells.hpp
+++ b/addons/jam/CfgMagazineWells.hpp
@@ -32,6 +32,7 @@ class CfgMagazineWells {
 
     // Pistol calibre magwells, ordered lexicographically in metric and imperial groups
     #include "magwells_10mmAuto.hpp"    // 10mm Auto | 10mm Automatic | 10x25mm
+    #include "magwells_570x28.hpp"      // 5.70x28mm
     #include "magwells_762x25.hpp"      // 7.62x25mm Tokarev
     #include "magwells_762x38R.hpp"     // 7.62x38mmR | 7.62 mm Nagant
     #include "magwells_763x25.hpp"      // 7.63x25mm Mauser | .30 Mauser Automatic
diff --git a/addons/jam/CfgWeapons.hpp b/addons/jam/CfgWeapons.hpp
index f9beeaf16..680dafebe 100644
--- a/addons/jam/CfgWeapons.hpp
+++ b/addons/jam/CfgWeapons.hpp
@@ -100,4 +100,8 @@ class CfgWeapons {
     class MMG_02_base_F: Rifle_Long_Base_F {
         magazineWell[] = {"CBA_338NM_LINKS"};
     };
+
+    class SMG_03_TR_BASE: Rifle_Base_F {
+        magazineWell[] = {"CBA_570x28_P90"};
+    };
 };
diff --git a/addons/jam/magwells_40SW.hpp b/addons/jam/magwells_40SW.hpp
index ff94c8726..28e316f55 100644
--- a/addons/jam/magwells_40SW.hpp
+++ b/addons/jam/magwells_40SW.hpp
@@ -4,3 +4,4 @@
     class CBA_40SW_P226 {};         // SIG P226 .40 S&W
     class CBA_40SW_P229 {};         // SIG P229 .40 S&W
     class CBA_40SW_P239 {};         // SIG P239 .40 S&W
+    class CBA_40SW_UMP {};          // HK UMP 40
diff --git a/addons/jam/magwells_45ACP.hpp b/addons/jam/magwells_45ACP.hpp
index c9f8d5caa..bdf6e5f8c 100644
--- a/addons/jam/magwells_45ACP.hpp
+++ b/addons/jam/magwells_45ACP.hpp
@@ -8,3 +8,4 @@
     class CBA_45ACP_Reising {};         // M50/M55 Reising
     class CBA_45ACP_Thompson_Stick {};  // Thompson stick magazines
     class CBA_45ACP_Thompson_Drum {};   // Thompson drum magazines
+    class CBA_45ACP_UMP {};             // HK UMP 45
diff --git a/addons/jam/magwells_556x45.hpp b/addons/jam/magwells_556x45.hpp
index 14b3f50d7..413be1e70 100644
--- a/addons/jam/magwells_556x45.hpp
+++ b/addons/jam/magwells_556x45.hpp
@@ -3,6 +3,7 @@
     class CBA_556x45_FAMAS {};          // FAMAS F1
     class CBA_556x45_G36 {};            // H&K G36
     class CBA_556x45_HK33 {};           // H&K 33/53/93
+    class CBA_556x45_M21 {};            // Zastava M21
 
     class CBA_556x45_MINIMI {
         BI_boxes[] = {
diff --git a/addons/jam/magwells_570x28.hpp b/addons/jam/magwells_570x28.hpp
new file mode 100644
index 000000000..a8a23204c
--- /dev/null
+++ b/addons/jam/magwells_570x28.hpp
@@ -0,0 +1,6 @@
+    class CBA_570x28_FN57 {};        // FN Five-Seven  
+    class CBA_570x28_P90 {           // FN P90
+        BI_mags[] = {
+            "50Rnd_570x28_SMG_03"
+        };
+    };
diff --git a/addons/jam/magwells_792x57.hpp b/addons/jam/magwells_792x57.hpp
index 1e8b06c05..c7a7f4c80 100644
--- a/addons/jam/magwells_792x57.hpp
+++ b/addons/jam/magwells_792x57.hpp
@@ -2,5 +2,6 @@
     class CBA_792x57_G43 {};        // G43, G41
     class CBA_792x57_K98 {};        // K98, G98
     class CBA_792x57_LINKS {};      // MG42, MG34
+    class CBA_792x57_M76 {};        // Zastava M76
     class CBA_792x57_MG08 {};       // MG08
     class CBA_792x57_TROMMEL {};    // MG34 Patronentrommel 34
diff --git a/addons/jam/magwells_9x19.hpp b/addons/jam/magwells_9x19.hpp
index 7fb43e90d..d67c8bfab 100644
--- a/addons/jam/magwells_9x19.hpp
+++ b/addons/jam/magwells_9x19.hpp
@@ -7,6 +7,7 @@
     class CBA_9x19_Glock_Cpct {};   // Compact Glock in 9x19mm (Glock 19, 46)
     class CBA_9x19_Glock_Full {};   // Fullsize Glock in 9x19mm (Glock 17, 18, 34, 45)
     class CBA_9x19_HiPower {};      // Browning HiPower
+    class CBA_9x19_M9 {};           // Beretta M9
     class CBA_9x19_MP40 {};         // MP40, MP38
     class CBA_9x19_MP443 {};        // MP-443 Grach
     class CBA_9x19_MP5 {};          // H&K MP5
@@ -23,6 +24,7 @@
     class CBA_9x19_STEN {};         // STEN
     class CBA_9x19_STEYR {};        // AUG SMG, MPi, TMP
     class CBA_9x19_TT {};           // TT-33 Tokarev in 9x19mm (M48, Tokagypt 58, Type 54)
+    class CBA_9x19_UMP {};          // HK UMP 9
     class CBA_9x19_Vis {};          // wz. 35 Vis (Radom)
     class CBA_9x19_Vityaz {};       // Vityaz-SN
     class CBA_9x19_Vz68 {};         // Škorpion (vz. 68)