A friend of mine is a very good competition rifle shooter and prefers the AR-15 rifles. He bought a 15-22 solely to practice with but wanted it to be a copy of his competition rifle. It now sports a solid stock, Rock River trigger, a steel rod machined and fastened inside the top of the handguard and the whole rifle weighs about 10 lbs. He has also made a little single round loading device and is working on a single round magazine.. It all works just fine and he used it in the indoor rifle league for the 1st time Thursday. He is one happy shooter.