I have spent alot of time reading all of the new info in this forum. This is a great source of information. I am not clear about what bolt carrier/bolt assly is used in the 9mm AR pistol. I am buying a stripped 9mm pistol lower to build a 9mm AR pistol. I have enough spare parts to complete the lower assly. I have a complete 9mm upper carbine assly that I can use. I will shorten the barrel to 10.5 inches.  I am ordering the buffer tube and spring from Ace. Do I use the stock carbine bolt carrier/bolt assly I have? Any advice is appreciated.

Same bolt.