Shop › NSDRC Aluminum Horn for the TRX4M | NSD-TRX4H NSDRC Aluminum Horn for the TRX4M | NSD-TRX4H $8.99 Fully Cnc'd aluminum Horn for the Trx4m* Horn Only Now with M2.5 Threaded holesHorn has a 25T 4.9mm Micro Spline Fully Cnc'd aluminum Horn for the Trx4m* Horn Only Now with M2.5 Threaded holesHorn has a 25T 4.9mm Micro Spline Add To Cart Added!