Keep this upper as a basic beater.
Try a 18 or 20" barrel with a rifle length gas system. It will be pleasant to shoot.
Other posters mentioning a heavy buffer will help, but not nearly as much as either a rifle length gas tube or a properly sized gas port.
The best option if you want to keep this gun/upper would be to install an asjustable gas block this allows you to dial the gas to be just enough to cycle the gun.
Some pictures of the gun would help us too.
All fixes to the gas block and buffer will help with recoil, but a longer barrel is the best fix for noise and concussion.
Try a 18 or 20" barrel with a rifle length gas system. It will be pleasant to shoot.
Other posters mentioning a heavy buffer will help, but not nearly as much as either a rifle length gas tube or a properly sized gas port.
The best option if you want to keep this gun/upper would be to install an asjustable gas block this allows you to dial the gas to be just enough to cycle the gun.
Some pictures of the gun would help us too.
All fixes to the gas block and buffer will help with recoil, but a longer barrel is the best fix for noise and concussion.