IMO, Ayan at
boltcarrier.com is the best place to purchase anything KAC. I met him years ago when I was in the industry, and I do everything I can to support him. On top of that, he is a KAC certified armorer, and does outstanding shop work. I'm not alone in this sentiment, as he is
the popular choice amongst avid KAC fans. That is where I purchased my Mod 2, and it also happened to be the best price around when I bought it.
That being said, I've bought KAC products from Gun Gallery in Jax, Neil and the gang are a great bunch. I've also purchased from Operational Parts, but that's because nobody else had the part I needed. Experience was fine, but I don't know them. Lawmen's is also a good source, as they're affiliated with KAC.