Don't buy it!! I just got a Bushmaster M4A3 for Christmas. That thing has been nothing but a headache since. Took to the range 3 seperate time and shot 3 different types of ammo, the rifle repeatedly short stroked, failed to feed, failed to eject and stove piped. Took the rifle back to store where it was purchased. They shipped it back to Bushmaster with clearly stated instructions to replace the entire upper assembly. Contacted Bushmaster personally to reiterate the problems and request replacement upper assembly. Was told their gunsmith would contact me directly, never did. The replaced the bolt, "alleviated chamber" pressure, polished the chamber and feed ramps. Received the rifle back from the store, now it will not chamber any brass .223 while dry cycling. They test fired 90 rounds through it supposedly. The gas tube has changed color they heated it up so badly. The store where it was purchased from is so bent out of shape over how Bushmaster handled it they are completely replacing the rifle tomorrow for me. Who buys something new, has a problem with it, takes it back only to have it rigged and handed back to you in worse shape. The rifle was new and I expected to receive a replaced new upper assembly not one tinkered and machined on! Don't buy it, go with a Colt or an Armalite instead.