Fixed gun duplication

Closes #602

Author: Lorenzo0111

src/main/java/me/zombie_striker/qg/listener/QAListener.java

@@ -248,6 +248,12 @@ public void oninvClick(final InventoryClickEvent e) {
 				// restore placed item because cancelling an event seems to wipe it.
 				// it will make cursor item look disappeared, but it'll be dropped when inventory is closed
 				e.getView().setCursor(cursor);
+			} else {
+				ItemStack item = e.getCurrentItem();
+
+				if (e.getSlot() == OFFHAND_SLOT && QualityArmory.isGun(item)) {
+					e.setCancelled(true);
+				}
 			}
 		}
 

src/main/resources/changelog.txt

@@ -1,3 +1,7 @@
+2.0.17
+  - 1.21.4 support
+  - Fixed gun duplication
+
 2.0.16
   - Fixed invalid air drop
   - 1.21.3 support