what are Differnces between these 2?

a member here has looks like same thing and he said its a P-rod
0307200908a.1602757912.1602984571.jpg

 
Holy cow is that customed! Even the bolt is on the "wrong" side. Beautiful wood. This fellow must like having projects.

A Prod would need a shroud extension too, as a moderator on the end of a Prod, even with a cone adapter like I got from DonnyFL, is screwed in extremely close to the endpoint of the air cylinder and its cap. Definitely a big deal what he's doing.
 
Tube extensions, longer barrels and shrouds for a Prod? Are you guys trying to build a Fortitude out of a Prod for twice the cost? LOL😅 sorry don’t want to burst bubbles but that pretty much the direction this is going. 

OK I get it. Customizing and modding is fun. I don’t know anyone that makes the tube extensions for the Prod any longer unless you’re having it custom made. The tube extension in the Talon Tunes link isn’t even available any longer and it only fits the Marauder rifle with the 1.25” tube. The Prod tube is 7/8” the same as the Disco, Maximus, Fortitude, and other 22xx family of guns. 

If you guys are really seriously wanting a longer tube for a Prod you might contact Don Cothran. He might be able to make you a longer tube that’ll accept a Prod breech. I wouldn’t say he will but we don't know until someone asks.

https://cothranmachine.com/