Comic books are all about setting aside reality and disbelief, and letting the imagination run wild. There's no denying the real-world implausibility of the characters, scenarios, and various gadgets seen in comic books, but some stand out like a sore thumb. This is especially true when it comes to weapons used by many of the characters.

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Marvel Comics weapons are indeed some of the most unique and inventive in all of comicdom. However, if anyone tried replicating them in the real world, they'd faced a series of significant challenges. Some weapons are better left in the realm of fantasy, rather than in the minds of would-be engineers and creatives.

Captain America's Shield

Captain America blocking incoming fire with his vibranium shield

Captain America has his fair share of weird comic book tales, but that shield is bizarre all by itself. There isn't a human being alive that could wield Cap's shield with any degree of accuracy. In the comics, the shield is used primarily as an offensive weapon, rather than a defensive item. Captain America can block a number of kinetic and energy-based attacks, but a real-life wielder would hardly get the chance if used as truly intended.

When thrown, the shield bounces off of objects (and people) before returning back to the user. Not only would this require an inhuman level of skill, but the laws of physics themselves wouldn't hold up. Plus, it's made out of vibranium, which means any special properties that give the shield its "bounce" would be lost.

Iron Man's Suit

Iron Man flying through the air with his power armor

Suspension of disbelief is a hard requirement for swallowing the pitch of Tony Stark's Iron Man armor, and for good reason. Although humanity is getting closer and closer to a workable exo-suit, it'll be decades (or more) before anything like the Iron Man suit becomes a reality.

Part of the problem is the power source required to run such a creation. Ark energy doesn't exist in the real world, which means any attempt to power the thing would be met with failure. Even if someone were to cram down a nuclear-based power source into the suit, it still wouldn't be the agile, sleek, and powerful weapon from the comics, or the films.

The Venom Symbiote

Venom leaping through the city skyline with his symbiote activated

The Venom symbiote has granted immense power to many Marvel characters over the years, and for all intents and purposes, it's a weapon unto itself. This biological terror can change a person's entire physiology from the ground up. It bonds perfectly to any life form it comes into contact with, imbuing it with super-strength, senses, reflexes, and a host of other abilities.

In reality, a Venom-style symbiote simply wouldn't be practical. It's less likely that the bonding would be so effortless, and far more likely that it would kill the host immediately, or in short order. Alien life from a different ecosystem would be subject to its own evolutionary timeline, not to mention the various viruses that come with it. A creature like Venom would end up being a nightmarish biological cocktail on the human body.

Wolverine's Adamantium Skeleton

Wolverine with his skin melted off and his adamantium skeleton showing

Many Marvel fans might be amazed to know that experiments with bonding various metals to things like spider silk and bone is quite possible, but not to the extent of the Wolverine comics. While the concept of having an unbreakable skeleton and retractable adamantium claws is undoubtedly cool, it wouldn't work in a real-life scenario.

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Part of the problem is bone marrow, which requires oxygenation. Bones are porous by nature, and red blood cells created by marrow move into the circulatory system to carry oxygen to the rest of the body. Bone marrow also stores vital information on viral infections, and helps mount a defense against future ones. Smothering bones in adamantium or any other metal would effectively kill these processes altogether.

Dr. Doom's Fingertip Darts

Dr. Doom fires his poisonous finger darts

Dr. Doom's fearsome suit of armor has a ton of built-in defensive and offensive technologies that have allowed him to commit some of the most heinous acts in the Marvel Universe. Not all of these gadgets are equal in terms of practicality, however. The rarely used fingertip darts are a perfect example.

These small darts are literally fired from the fingertips of Doom's gauntlets, as the name suggests. They are not intended for kinetic damage, but rather the injection of poison into the victim. In the real world, these darts would only get a single use, and require some sort of propulsion system to work. When compared to the rest of Doom's suit weaponry, these seem rather pointless.

Spider-Man's Web Shooters

Spider-Man firing both his web shooters at once

Of all the real-world properties that could theoretically be converted into a weapon, Spider-Man's web shooters seem one of the most plausible. Spider silk is routinely used in a variety of modern applications, and the research into this material seems endless.

The problem with the web shooters from a practical standpoint is how quickly a user would run out of webbing. There's simply no way a person could swing through a metropolis like New York City and web up criminals all night long, without running out of material. Even if a person took along spare cartridges, they would need a ton of them to make it through a single night, to say nothing of the replacement cost factor.

Black Panther's Spider Bites

The Black Panther Shuri hurling Spider-BItes to incapacitate two guards

There's a ton of cool Black Panther weaponry that many fans want to see in the film sequel, but some weapons should remain where they are, including the Spider Bites. All the wielder need do is hurl one of these little golden orbs at a target, causing it to explode and deal a non-lethal dose of electricity and gas. The objective is to incapacitate, rather than kill.

However, a real-world equivalent would be wrought with problems, particularly when it comes to activation. Some sort of sensor would need to be placed in each Spider Bite for it to correctly identify a target, which seems implausible. Without such a device, the carrier could inadvertently set one (or all) of them off by taking a hit, or simply tripping and falling over.

The Retroactive Cannon

The Time Variance Authority reveals their most powerful weapon, the Ret-Can

Nothing befuddles the human brain worse than a good old fashioned time paradox, which makes the Time Variance Authority's Retroactive Cannon - or "Ret-Can" for short - such an impractical weapon. Even if such a device were to exist in the real world, the ramifications of using it would undoubtedly be disastrous.

The weapon pummels a target with anti-temporal rays, effectively sending them back through time until they are erased from existence. Sounds straightforward enough, until the laws of time start kicking in. In the real world, a person's decisions and actions would affect the entire timeline, whether great or small. Erasing said person would theoretically erase those decisions, and possibly the entire fabric of reality in the process.

Hawkeye's Bow

Hawkeye gets ready to fire an arrow while leaping through the air

Hawkeye's main selling point is his pinpoint accuracy, on par with Bullseye when it comes to striking targets. He relies on his trusty bow and an assortment of specialty arrows to deal with threats, which sounds fine in a real-world application, at least until the individual runs out of arrows.

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This is touched on only a few times in the MCU films, and long after reality has checked out. The truth is that Hawkeye's quiver isn't quite that large, and even if he's yanking arrows out of targets and re-using them, he's bound to run out eventually. So would anyone else in his place.

The Paste-Gun

The Trapster aiming his Paste-Gun at Spider-Man on a rooftop

Nothing says "impractical" quite like the Paste-Gun used by the Trapster. The weapon was conceptualized in the 1960s (naturally) for Strange Tales #104, but it has made other appearances. The weapon fires an instantly hardening, flame-proof stream of glue that can incapacitate targets, form defensive walls, or clog up various machinery.

The impracticality of the weapon speaks for itself, as it required the use of a hip or backpack canister connected to the gun via a thick armored cable. This would drastically reduce mobility, making the weapon cumbersome and ineffective in a fight. Plus, if anyone punctured the canister, it would be lights out for the person holding the gun.

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