According to the wiki:
The Asura Path (修羅道, Shuradō) grants the user the ability to augment their own body to summon mechanised armour and various ballistic and mechanical weaponry.
Two questions on this topic.
1) Kishimoto has said there is no technology in the Naruto universe that would defeat the purpose of ninjas, specifically guns and weapons. However, why did he have the Asura Path of Pain equipped with machine guns, rockets, and lasers? Here's a quote from him:
Masashi Kishimoto: Firstly, projectile weapons such as guns aren't allowed. (The one exception is Inari's bowgun.) Guns aren't suited to ninja. Gunpowder is used in the anime, though I don't think it should be there. And, vehicles such as aeroplanes are not allowed. I try to restrain technology that can be used for war... For example, if missiles were in it, it'd be the end. (laughs)
It turns out when Pain assaulted the Hidden Leaf Village, it pretty much was the end! So why did he say these things would not be in the Naruto universe when in fact they were?
2) So all the Rinnegan wielders have access to the Six Paths. Does that mean the highly advanced weapons from the Asura Path of Pain originated from the Sage of the Six Paths himself? In other words, did the Sage of the Six paths have some lesser, technologically inferior form of machine guns, rockets, etc. long ago for his Asura Path powers?
Also, what exactly are the powers for people who've wielded the Rinnegan at some point, like Obito, Madara, and Sasuke, regarding the Asura Path? Can they even use it since it involves constructing your own weapons? Or is there something they do to summon these weapons?