They're concerned about semi-autos like 1911s, cz-52s, cz-82s, Makarovs, Tokarevs, et al. New York is a very anti-handgun state. They are also worried about someone buying a metric shit-ton of SKS's. ATF asks all the time if a C&R holder orders a bunch of the same weapons at once. Buying 3 guns to pick the best one, have one for parts and maybe sell the other fine. Buy a dozen tokarevs and sell off 8 in a couple month period, to a non-licensee holder, you're not casually selling your property, you're an unlicensed dealer.
As for Texas, remember according to the A-holes in Washington, most of the Mexican drug cartel's weapons are coming from the US. I wouldn't be surprised if Uncle Sugar was throwing money (grant money) at the local constabulary for increased "weapons trafficking" investigations/ arrest. Some of best toys are paid for with grant money or seized assets.