I have sent the 21A back to the factory for warranty service. No change. I have tried mini-mags, stingers, etc. No change. I have lubed it, prayed for it, done everything which I could do. No change. The manual discourages the use of high-powered ammo. Yet, that is all I hear on the reviews. This object is the Yugo of firearms. All it does is fail to feed. It is of no use as a concealed carry gun and no use on the range as all I do is fight it. BTW I am a military veteran and grew up in rural Oklahoma and am familiar with firearms. I have a Ruger Single Six which I love.