Just need clarification on AAC piston and USP 9SD.

[Bluedragon]

Contemplating on buying a H&K USP 9SD for it's threaded barrel and adjustable sights. I read up that the thread pitch is 13.5x1 LH. I currently am waiting for my Form 4's to be processed for an AAC ECO 9 that has a thread pitch of 1/2x28. Looking on silencer shop I see AAC sells different pistons and one of them is the 13.5x1 LH.

I just wanna make doubly sure before I buy or order anything that if I get the USP and order the piston that matches the thread pitch on the H&K that is all I will need to run it on the gun?

 

[Bluedragon]

Just bumping the thread to see if anyone can answer my question. Still contemplating on the USP 9SD.

 

[digitalrebel80]

All you need is the piston with the correct thread pitch they are made to change between different host wepons

 

[Bluedragon]

Alright thanks for letting me know. May seem like a silly thing to ask but I just wanna make sure that was the case before I think about dumping $1,200 for a new H&K and then another $80 something for the piston. The AAC is my first can so I don't know a whole lot about changing thread pitches for different guns.