To pass a constitutional amendment, the way all since the bill of rights were passed, you need a 2/3 majority of both houses of Congress, and ratification by 3/4 of the state legislatures. So 34 senators, or 146 representatives, or the legislatures of 13 states can deny any proposed amendments.
In our current climate I’d wager that 45-60 senators would oppose this (most Rs, even RINOs plus some Ds that remember 1994). Highly unlikely it would even get a simple majority in the House, let alone 2/3 majority. They might struggle to get even 13 states to ratify. The left coast, most of New England and mid-Atlantic, Illinois, but that’s probably it. That coalition could stop an amendment to strengthen the 2A but can’t repeal it.