Here is the bill summary:
To amend chapter 44 of title 18, United States Code, to update certain procedures applicable to commerce in firearms and remove certain Federal restrictions on interstate firearms transactions.
It looks hard to summarize because it is amending sections of the US code, so it just includes line items like:
(a) Firearms Dispositions.--Section 922(b)(3)(A) of title 18,
United States Code, is amended--
(1) by striking "rifle or shotgun'' and inserting "firearm'';
edited to improve formatting on the quotes