How to make this code DRY?

I am writing a RESTful service with C # / wcf and you need to put filters in GET. How and how many records to return, maybe if I want to filter something, etc. Consider this code:

[WebGet(UriTemplate = "/devices/{DeviceId}/positions")]
        public List<GPSPosition> GetDevicePositions(string deviceId)
        {
            //Lookup device:
            using (var context = new MobileModelContext(ContextManager.AccountGKey.Value))
            {
                var d = context.Devices.Where(aa => aa.DeviceId == deviceId).FirstOrDefault();
                if (d == null)
                {
                    outgoingResponse.StatusCode = HttpStatusCode.NotFound;
                    outgoingResponse.StatusDescription = "Device not found";
                    return null;
                }

                var query = from p in context.Positions
                            where p.DeviceKey.Equals(d.DeviceKey)
                            select new GPSPosition
                            {
                                PositionGKey = p.PositionGKey,
                                Latitude = p.Latitude,
                                Longitude = p.Longitude,
                                Speed = p.Speed,
                                Accuracy = p.Accuracy,
                                Altitude = p.Altitude,
                                GPSTime = p.GPSTime,
                                DeviceTime = p.DeviceTime
                            };

                return query.ToList();
            }
        }

        [WebGet(UriTemplate = "/devices/{DeviceId}/positions?RecordCount={RecordCount}")]
        public List<GPSPosition> GetDevicePositions2(string deviceId, int recordCount)
        {
            //Lookup device:
            using (var context = new MobileModelContext(ContextManager.AccountGKey.Value))
            {
                var d = context.Devices.Where(aa => aa.DeviceId == deviceId).FirstOrDefault();
                if (d == null)
                {
                    outgoingResponse.StatusCode = HttpStatusCode.NotFound;
                    outgoingResponse.StatusDescription = "Device not found";
                    return null;
                }

                var query = from p in context.Positions
                            where p.DeviceKey.Equals(d.DeviceKey)
                            select new GPSPosition
                            {
                                PositionGKey = p.PositionGKey,
                                Latitude = p.Latitude,
                                Longitude = p.Longitude,
                                Speed = p.Speed,
                                Accuracy = p.Accuracy,
                                Altitude = p.Altitude,
                                GPSTime = p.GPSTime,
                                DeviceTime = p.DeviceTime
                            };

                return query.Take(recordCount).ToList();
            }
        }

Lots of repetitions. I can move the code to another function, but still I have 2 templates, I have 2 functions. Is there a way to make 1 template for / provisions / that will cover all possible "?" scripts?