John Sides compares NRA-member gunowners to non-members:

[G]un owners who were not NRA members were more supportive of gun control than guns owners who were NRA members. Forty percent of non-NRA gun owners supported a national gun registry. Forty percent supported a ban on the sale of magazines with more than 10 rounds. Thirty-six percent supported a ban on semi-automatic weapons—a striking figure given that almost every gun sold today is semi-automatic and gun owners would be likely to know that. To be sure, this means that the majority of gun owners—regardless of whether they belonged to the NRA—opposed many forms of gun control. But on the other hand, this list of gun laws did not include some popular proposals. For example, gun owners, regardless of NRA membership, appear to support criminal background checks.