Please go back and read the Wikipedia link I posted. It will explain what you refuse to understand. The "April" issue of American Rifleman appeared on newsstands and in mailboxes at the beginning of March.
Wikipedia still has a long way to go before it becomes a credible and reliable source, but even if the April issue appeared on news stands at the beginning of March, it still does not alter the fact that he Hidell order form clearly refers to the February issue.
The most remarkable part of this discussion is how LNs are trying to put a square peg into a round hole.
This was supposed to be a simple, normal, transaction. A guy orders a mail order rifle from the February issue of some magazine and either receives that rifle or gets notified it's out of stock.
Here we have, as so often in this case, as massive spin story on how a 36" rifle ordered from the February issue of a magazine somehow turns into an alleged delivery of a 40" rifle that wasn't advertised until the April issue of the same magazine.
Even worse, there isn't even a shred of evidence that any rifle was actually sent to a P.O. box in Dallas and/or was received by anybody.
LNs who actually believe and defend this BS have no sense of reality but could do very well by a applying for a job at Disney Land!