David, Radical Firearms' 300 BO's are getting pretty good reviews these days. Radical has had to step up their game from when they first came on the scene, in order to survive in the competitive AR-15 arena. Otherwise, they'd have been gone already. This should be a reliable firearm - although EVERY manufacturer has an occasional 'lemon' sneak out of the factory. From what I read, Radical would be good about stepping up to the plate and getting any problems corrected in a timely fashion.

David, I own the Radical 300 BLK upper. Have used it on several lowers including an all polymer unit. No issues what so ever. Handles all weight of rounds. Function well suppressed. Have not had one issue over 2000+ rounds down range. Quality components including BCG and barrel.

David, Radical has come a long way in terms of reliability currently in contrast to their reliability when first introduced a few years ago. I have a Radical 5.56 and am satisfied with the performance and reliability.