{
    if(readyToShoot == true && ammo >0 and lobbed<maxAmmo) {
        var oid, newx, newy;
        playsound(x,y,MinegunSnd);
        ammo -= 1;

        oid = instance_create(x+lengthdir_x(10,owner.aimDirection),y+lengthdir_y(10,owner.aimDirection), Mine);

        oid.direction=owner.aimDirection;
        oid.speed=12;
        oid.owner=owner;
        oid.ownerPlayer=ownerPlayer;
        oid.team=owner.team;
        oid.weapon=WEAPON_MINEGUN;
        lobbed += 1;
        justShot=true;
        readyToShoot = false;
        alarm[0] = reloadTime;
        alarm[5] = 0;
    }
}





And the bit in the mines causing self destroy:


if explosionDamage < 50 explosionDamage += 1;

if(not stickied) {
    vspeed+=0.2;
    vspeed=min(vspeed,8);
}

if ownerPlayer == other.ownerPlayer instance_destroy();



Only thing changed with mines was tthe destroy event itself:

if global.myself.object.currentWeapon.object_index = Minegun owner.currentWeapon.lobbed -= 1;
else global.myself.object.lobbed -= 1;