Wondering for those of you who have bought or built an AR pistol what the requirements are? I called a place asking about it and was told they didn't have AR pistol lowers in stock. What makes an AR lower pistol specific? Wouldn't they all be the same lowers? Does NY require them to be marked specifically as a pistol? (I know it has to be on my permit.) Also a side question: is there a difference between a lower for 5.56 vs 300BLK or is it the same lower for both?
Thank you.
Thank you.