Weapons are not entirely reliable within this modification, meaning that the Shotgun and Double-Barrelled Shotgun can jam, while the Grenade Launcher and Rocket Launcher will explode from overuse. The mechanisms are able to be overheated if not intended to be rapid-fire weaponry, the Nailgun in particular would not overheat due to being gas-powered. The player should not run into these unless they are continuously spamming their Weapon; for example this prevents campers from spamming an endless stream of grenades.
The over-usage mechanism is determined by a random variable combined with the time the player has been firing the Weapon. The time between each shot is averaged; if it is lower than a certain number the Weapon will fail from overuse. Stopping a half second can be enough to raise the average time and prevent a jam/explosion. A Shotgun will be jammed for 2 seconds, while a Double-Barrelled Shotgun will be jammed for 4 seconds. The time it takes to no longer be jammed will be increased if the player continues to fire the Weapon while it is jammed. The player can expect to fire the Shotgun 18 times, the Double-Barrelled Shotgun 14 times, the Grenade Launcher 12 times, and the Rocket Launcher 8 times continuously before it will fail on average.
This modification also slows down the Nailgun, Super Nailgun, and Rocket Launcher when the projectile travels through Water as it holds more resistance than air (though they are still relatively fast). The Grenade Launcher is even more severe, being able to only travel a short distance from the player's location and thus not being ideal for underwater combat. The Rocket Launcher will produce bubbles when it explodes in Water.
This modification also punishes players that hold a large number of Rockets by forcing them to move slower. While still not entirely realistic, since 100 Rockets still is impossible to be held by one person, it is a step towards greater realism. 100 Rockets will cause a player to move at half speed, including jumping height, meaning they are mostly a sitting duck. A player with a couple Rockets will be able to move at normal speeds, it starts becoming noticeable around 30-40 Rockets. The only speeds not affected are turning ability and the speed of falling.
Furthermore, the Grenade Launcher and Rocket Launcher have recoil, adding a realistic kickback from Weapons that would be shoulder-mounted in real life. While this recoil is small, it is noticeable enough that the player should be careful to not be too close to the edge of a platform. One benefit of having more Rockets is that the added weight will lower the severity of the recoil.
Impulse 20 can be used to drop a Backpack with half of the player's currently held Rockets. This can be used to decrease the player's weight and give them more speed, thus allowing them to clear jumps they otherwise would not be able to get across. Note however that the Backpack will drop on the player, meaning it will be taken immediately and thus does not function properly. The player can also get a minor speed increase (up to the default speed, this is used to speed up a player being slowed down by Rockets) if they pick up a 100 Health; it is proportional to the percentage of health above 100.
Almost all physical objects, including any projectiles, can now go through Teleporters. Note however that this feature is buggy and shall result in certain levels, such as E2M1: the Installation, crashing immediately.