that DSA 14.5" is chrome lined and 1-7" -- i been eyeing it even before the panic-- they might have a few of them left cause their NFA DBR or you have attach a longer FH to get the barrel length up to 16"--
i have one of the DSA 14.5" barrels --it will give any of the big name 14" s a serious run for their money.
before the panic DSA has a lot of nitrided barrels and uppers-- hell i wish i had bought one of them too--LOL!
About the barrel twist, I was under the impression the 1-9" was preferable because it handled a wider selection of bullet weights. Does the 1-7" perform better in shorter barrels?