Allow PKA to gather (#16250)

Content.Server/Gatherable/GatherableSystem.Projectile.cs

@@ -0,0 +1,28 @@
+using Content.Server.Gatherable.Components;
+using Content.Server.Projectiles;
+using Content.Shared.Projectiles;
+using Content.Shared.Weapons.Ranged.Systems;
+using Robust.Shared.Physics.Events;
+
+namespace Content.Server.Gatherable;
+
+public sealed partial class GatherableSystem
+{
+    private void InitializeProjectile()
+    {
+        SubscribeLocalEvent<GatheringProjectileComponent, StartCollideEvent>(OnProjectileCollide);
+    }
+
+    private void OnProjectileCollide(EntityUid uid, GatheringProjectileComponent component, ref StartCollideEvent args)
+    {
+        if (!args.OtherFixture.Hard ||
+            args.OurFixture.ID != SharedProjectileSystem.ProjectileFixture ||
+            !TryComp<GatherableComponent>(args.OtherEntity, out var gatherable))
+        {
+            return;
+        }
+
+        Gather(args.OtherEntity, uid, gatherable);
+        QueueDel(uid);
+    }
+}