I dont shoot matches, so take this reply with a grain of salt, but if you need to change out stocks thats easy to do. Buy an all in one barrel nut / spanner wrench, an A2 stock, rifle lenght buffer,tube and spring. The same can be said for the barrel and freel float tube. As long as you have a vice, upper and lower receiver blocks its easy. Buy a new barrel of your choice, and a railed gas block and gas tube depending on barrel length. Then a detachable carry handle and front sight, swap out triggers and there ya go. The good thing is that with the QD carry handle and fron sight you can scope it if you want for what ever reason.