If you go featureless, you do not need the lock. I recently installed a Hellfighter kit on an AR15. I initially liked the concept of the receiver being limited as it opened, but in practice, that part made it a real pain to split the halves and get at the bolt and buffer. Not impossible, just a pain. With the Hellfighter, you lose the bolt stop and cannot lock the bolt back. Now that can be a plus, because it won’t lock back on empty. At which point you would release the bolt, split halves and then swap mags. The AR mag lock keeps the bolt stop if you want to have one. MEAN arms makes a loader you can drive rounds into the mag through the ejection port. Lots of options. Each is going to be user specific.