This is the best looking kit i've seen. Very happy, especially for the $$. be careful though, if you want to add a shoulder stabilizer like the SBA3 you will need to get a traditional buffer tube.
Ghost Firearms 10.5" Flash Can Upper Receiver Pistol Build Kit
*****Ammunition Notification***** Ghost Firearms test fires every custom upper to verify cycling. We do not guarantee cycling with all ammunition due to vast differences in the quality of ammunition. We will only warranty cycling with US made ammunition. We will not warranty cycling with imported, steel cased or reloaded rounds.