It's partially true, at least that Schumer has put an amendment in the cyber security bill to put the 10 round mag limit in place. Interestingly this doesn't just say "can't make more" but sounds like it would prevent sales and transfers of them as well.
Only the mag restriction was in this particular amendment, so anything other than that is untrue.
Took some doing, had to spend forever to find the actual amendment text and not just someone describing it, but here is the full text of the amendment:
SEC. __. PROHIBITION ON TRANSFER OR POSSESSION OF LARGE CAPACITY AMMUNITION FEEDING DEVICES.
(a) Definition.--Section 921(a) of title 18, United States Code, is amended by inserting after paragraph (29) the following:
``(30) The term `large capacity ammunition feeding device'--
``(A) means a magazine, belt, drum, feed strip, or similar device that has a capacity of, or that can be readily restored or converted to accept, more than 10 rounds of ammunition; but
``(B) does not include an attached tubular device designed to accept, and capable of operating only with, .22 caliber rimfire ammunition.''.
(b) Prohibitions.--Section 922 of such title is amended by inserting after subsection (u) the following:
``(v)(1)(A)(i) Except as provided in clause (ii), it shall be unlawful for a person to transfer or possess a large capacity ammunition feeding device.
[Page: S5403] ``(ii) Clause (i) shall not apply to the possession of a large capacity ammunition feeding device otherwise lawfully possessed within the United States on or before the date of the enactment of this subsection.
``(B) It shall be unlawful for any person to import or bring into the United States a large capacity ammunition feeding device.
``(2) Paragraph (1) shall not apply to--
``(A) a manufacture for, transfer to, or possession by the United States or a department or agency of the United States or a State or a department, agency, or political subdivision of a State, or a transfer to or possession by a law enforcement officer employed by such an entity for purposes of law enforcement (whether on or off duty);
``(B) a transfer to a licensee under title I of the Atomic Energy Act of 1954 for purposes of establishing and maintaining an on-site physical protection system and security organization required by Federal law, or possession by an employee or contractor of such a licensee on-site for such purposes or off-site for purposes of licensee-authorized training or transportation of nuclear materials;
``(C) the possession, by an individual who is retired from service with a law enforcement agency and is not otherwise prohibited from receiving ammunition, of a large capacity ammunition feeding device transferred to the individual by the agency upon that retirement; or
``(D) a manufacture, transfer, or possession of a large capacity ammunition feeding device by a licensed manufacturer or licensed importer for the purposes of testing or experimentation authorized by the Attorney General.''.
(c) Penalties.--Section 924(a) of such title is amended by adding at the end the following:
``(8) Whoever knowingly violates section 922(v) shall be fined under this title, imprisoned not more than 10 years, or both.''.
(d) Identification Markings.--Section 923(i) of such title is amended by adding at the end the following: ``A large capacity ammunition feeding device manufactured after the date of the enactment of this sentence shall be identified by a serial number that clearly shows that the device was manufactured after such date of enactment, and such other identification as the Attorney General may by regulation prescribe.''.
So whatever you own on the date this is signed into law you can keep, but you can't transfer them or acquire them after that date.
The "tracking" part of what you received must refer to the last paragraph of the amendment, which says any magazine > 10 rounds made after the law is passed must be serial numbered and tracked however the Atty General wants. Since they'd only be made for LEO and military use that's clearly just to track them back if used in a crime. It's "tracking" but misleading IMO b/c it's tracking something none of us would be able to possess anyway.
Fortunately this thing will be DOA in the House even if it makes it out of the Senate.