I bought myself a new rifle it's an ATI aluminum lower with a Chiappa 22 lr upper. The lower is a standard AR lower so it can work as a replacement lower. The upper is a dedicated 22 lr with an m4 style barrel A2 style flash hider and A post front sight with bayonet lug. It is a flat top with a quadrail hand guard. This thing is a lot of fun and chap to shoot. With the current unavailability of 5.56/223 I can still practice running my AR . I looked at the Smith and Wesson 15/22 and the Mossberg ar style but opted for this so I could run my lower on it for practice.