I only watched the clip. I found it funny on MANY levels. Others will find it funny for other reasons. But first of all, it is claimed that Cohen pranked lefties and righties in these episodes, including Bernie Sanders.  
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The character (Israeli commando) is funny. The patter is funny. The outlandish examples are tragically funny.  
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I didn't check to make sure that the people claimed to be gun supporters, gun organization spokesmen, Congressmen, and so on actually were those people and not actors. If they were actors, we'd be hearing about lawsuits already instead of admissions of "He tricked me! Bad man!"  So I'm going with the real people.
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It's funny how people with an agenda so easily bought into the claims because those claims and ideas were consistent with their own views and positions. Only one person (in the clip version) questioned the claims as being outlandish. No one else questioned the "fake news" that Cohen was spewing because they liked his message! This trait is not exclusive to pro-gun lobbyists or righties. Many lefties can be pranked, too.  
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What is also funny is that no one questioned how or IF the weapons are modified to make them easier for kids to use. A typical hand gun has, what, a 4-5 pound pull force? A 5 yo can pull that, w/o modification? Maybe with two hands, held between her knees pushed into the floor, but not in real time trying to take down an armed moving target attacking her classmates. What about the recoil? 5-10 foot-pounds? An unmodified weapon using unmodified ammo will probably bounce a kid back across the room while dislocating her shoulder. [Note: this paragraph was sarcasm.]  
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Not sarcasm: An instructor was killed at shooting range when a young girl could not control the recoil or quickly remove her finger from the trigger on an Uzi.
http://www.cbsnews.com/news/family-charles-vacca-gun-instructor-killed-girl-uzi-sues-arizona-range/
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Parents are buying bulletproof backpacks for their schoolkids:  
http://time.com/money/5175526/bulletproof-backpacks/
http://www.bulletblocker.com/bulletproof-school-safety-protection.html
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Why aren't the gun manufacturers coming out with better designs to make a child appropriate suite of weapons and ammo (lighter weights, smaller grips, lighter pulls, lighter loads) and gear (bulletproof vests, ammo belts in child sizes)?  Without better equipment, I predict more tragic accidents. (Note: more sarcasm.)
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This model comes in Ballistic Pink.