7/10.
The NRA there is in a font that would imply a slightly more advanced socialist-stylized National Recovery Act, rather than National Rifle Association.
The bird and streaks of light give a very socialist appearance, also suggesting the National Recovery Act's socialism rather than the NRA immediately. In fact, it looks more like socialist propaganda than the socialist propaganda it is.
As to the substance of the text, it manages to toss in an "America" font that looks old-timey (like something from Lester's Ammuntion ads), and the rest of it at least fits, but visually it starts to not work quite the same. There's a lot of empty red space in the bottom right that just doesn't fit so well. They could've filled that dead space with something.
The rifle itself isn't of a standard configuration to the current topic, so I'm sure it was chosen for its components and the alien, machine-like look of it, rather than basing it on something that currently exists. The forward grip is good, but the AK magazine really doesn't fit with the current debate that mostly centers around ARs. Unless it was chosen for the opportunity to put in an upside-down American flag with some subtlety, it just doesn't seem to work.
As to the actual text of the argument and the body of it, are you sure it isn't parody? The "God saves" is a cliched leftist dig at the religious Country Class used to express contempt, while the "Satan invests in assault weapons and high capacity magazines" is both wordy and stupid, and while insulting God and believers, is used to say that Satan as existential evil (or true evil, depending on one's belief system) would actually favor something. It fails there as well. Concerning the crux of the argument, that citizen disarmament is good, and guns are bad, m'kay, of course no true socialist will acknowledge that in any great leap forward on the long march, millions upon millions have to die, and they are kiled at the hands of governments, not at the hands of armed individuals. So juxtaposing the reality of the socialist/communist system that this style of propaganda developed from with its wording is simply a bizarre conflict and indicative of a clinical cognitive disability on the part of the propaganda artist. The artist doesn't know who Ivan Denisovich is, nor has he read Kolyma Tales.
Beyond this, there are other substantive visual issues, like the fact that what is shown, though an odd configuration, is clearly a rifle, hunting for doves (or any other bird) with a rifle is an aberration, to say the least; and indicative of someone who is unaware of how bird hunting (or shooting) even works.
Use of bold colors are good, trying to look like Soviet propaganda that would undermine American values is effective, because for some reason, Americans are believing Soviet propaganda, despite the raging failure of the USSR. Overall, I give it 7/10.
It's effecitve, but only if you're stupid, uninformed or apathetic; which is probably enough to still make its point.