For those beginning their adventure with shooting, technical terms can seem intricate; however, understanding the rimfire mechanism is a foundation for the conscious use of firearms. In this article, we will take a closer look at this specific group of weaponry, which has enjoyed unwavering popularity among both athletes and hobbyists for decades.

From this article, you will learn:

• Exactly what is a rimfire weapon and how does its mechanism work?
• What are the differences between rimfire and centerfire systems?
• What calibers dominate this category?
• What to look for when servicing and disassembling rifles?

What is a rimfire pistol?

Let’s start with a basic definition. The term rimfire pistol refers to the way the shot is initiated. In classic rimfire ammunition, the priming compound (primer) is not located in a separate cap in the center of the casing head, but is pressed inside the protruding edge (rim) of its base.

When you pull the trigger, the pistol's firing pin strikes the edge of the casing directly. The crushing of the rim causes the ignition of the compound, which then ignites the powder inside. This simple construction solution makes the casings thinner and cheaper to produce, and the weapon mechanism itself can be less massive than in the case of more powerful calibers.

Rimfire vs Centerfire: Which to choose?

A frequent question at shooting ranges is which system is better. The answer depends entirely on the intended use of the weapon.

• Economy and availability: Rimfire ammunition is significantly cheaper. This allows for firing hundreds of shots during a single training session without straining the budget.
• Recoil: Rimfire weapons are characterized by minimal recoil. This is an ideal solution for learning proper habits, trigger control, and for individuals with less physical strength.
• Power and range: Here, centerfire wins. Centerfire ammunition is loaded to much higher pressures, which translates into greater stopping power and range. For personal protection or big game hunting, centerfire systems are chosen.

Therefore, if your goal is recreation, improving technique, or participating in silhouette competitions, a rimfire pistol will be a sound choice.

What is a rimfire weapon?

The concept of a rimfire weapon covers a wide range of designs. We are not limited here only to short firearms.

• Pistols: Most commonly found in .22 LR caliber. They are used for target and dynamic shooting.
• Revolvers: Often chosen for their reliability and simplicity of operation.
• Rifles: Indispensable in learning the basics of long-distance shooting at shorter ranges (up to 100-150 meters).

It is worth noting that in practice, it is primarily about comfort and repeatability. Due to the low energy of the projectile, these designs are often lighter, which facilitates long-term static training.

Popular calibers:

When wondering what calibers are rimfire, most shooters immediately mention .22 LR. It is the most popular cartridge in the world, but the market offering is broader:

• .22 Short: Currently less common, once used in pistols for rapid-fire competitions.
• .22 WMR (Winchester Magnum Rimfire): A more powerful variant, offering significantly higher muzzle velocity and energy, often used in rifles for pest control.
• .17 HMR: A modern, very fast cartridge with a flat flight trajectory, excellent for precision shooting at a distance of 100 meters.

The choice of caliber determines not only the price of training but also the availability of accessories and the weapon itself at local distributors.

Servicing: Rimfire rifles assembly and disassembly

Taking care of the cleanliness of a rimfire weapon is important for one main reason: this ammunition is "dirty." Unjacketed lead and the specific chemical composition of the priming compound cause carbon fouling to build up quickly inside the barrel and the bolt.

The process of rimfire rifles assembly disassembly varies depending on the model. In popular designs, such as the Ruger 10/22 or AR-15 based platforms in .22 caliber, disassembly for basic cleaning usually does not require specialized tools. However, a few rules should be remembered:

• Always check the chamber before disassembly.
• Avoid "dry firing" without a snap cap – in many models, a firing pin striking the edge of the chamber directly can be damaged.
• Regularly remove deposits from the bolt face to avoid misfires and problems with casing extraction.

The role of specialists

Although many maintenance tasks can be performed independently, there are situations where it is worth visiting a workshop. Rimfire gunsmiths are professionals who specialize in tuning this delicate mechanics. Their tasks include, among others, polishing feed ramps, replacing springs with lighter ones, or bedding precision barrels in stocks.

In the case of rimfire weapons, where tolerances can be very tight and materials (such as aluminum alloys in bolts) are less resistant to errors than steel in battle rifles, a gunsmith's help can be invaluable when clearing jams or improving trigger action.

Rimfire weapons are not just a transitional stage for beginners, but a fully-fledged branch of shooting. Thanks to low operating costs, the great fun of shooting, and a wide selection of designs – from classic revolvers to modern sporting rifles – rimfire systems remain a foundation of shooting culture worldwide. Regardless of whether you plan to start in competitions or simply want to spend an afternoon at the range, a rimfire pistol will provide you with exactly what you need: accuracy and repeatable results.