Any good AR gunsmith will have a jig to make pin slots.
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If I were you I would go with Ballistic Advantage. Their barrels are competitively priced and come with a 1 MOA guarantee with good ammo. Like the guy said in a previous post it's a crap shoot with PSA. I just simply stay away period. You can get one of their modern series barrels for around 160 and one of their performance series barrels are right around 200. I would rather pay a little more and get a good barrel from the start rather than gamble with 120 bucks. If the barrel doesn't perform to your expectations they will send you another no questions ask. If you are willing to go a little higher their Hanson barrels are getting rave reviews. I have used a couple barrels from them and they are excellent barrels for a very good price. I highly recommend them. 120 for the length you are looking at.
Any good AR gunsmith will have a jig to make pin slots.