Knowing what ammo your gun uses is the first step to buying the right ammunition. Every firearm is designed for a specific cartridge, and choosing the correct ammo helps ensure proper fit, reliable function, and a better shooting experience.
Whether you own a handgun, AR-15, AK platform, pistol-caliber carbine, or rimfire rifle, this guide helps you quickly identify the correct ammunition for popular firearms.
At Bulk Ammo To Go, we help shooters find reliable ammunition options for training, competition, recreational shooting, and everyday range use. Use this guide to match your firearm with the right caliber and explore compatible bulk ammunition options.
How to Find the Correct Ammo for Your Firearm
Before purchasing ammunition, always confirm the caliber marked on your firearm.
Most firearms display their caliber information in one of these locations:
- Barrel markings
- Slide or receiver markings
- Manufacturer specifications
- Owner’s manual
The caliber marking tells you which cartridge your firearm is designed to use.
For example:
- A Glock 19 uses 9mm Luger ammunition
- An AR-15 commonly uses 5.56 NATO or .223 Remington ammunition
- A Draco AK pistol uses 7.62×39 ammunition
- A Ruger 10/22 uses .22 LR ammunition
Using the correct cartridge is essential. Ammunition that does not match your firearm specifications may not function properly and may create unsafe conditions.
Firearm Ammo Compatibility Guide
Use the chart below to quickly find common firearms and their matching ammunition.
| Firearm Platform | Compatible Ammo |
|---|---|
| Glock 19 | 9mm Luger |
| Glock 17 | 9mm Luger |
| Glock 20 | 10mm Auto |
| Glock 21 | .45 ACP |
| SIG Sauer P365 | 9mm Luger |
| 1911 Pistols | .45 ACP |
| AR-15 Rifle | 5.56 NATO / .223 Remington |
| AR-10 Rifle | .308 Winchester / 7.62 NATO |
| AK-47 Rifle | 7.62×39 |
| Century Draco AK Pistol | 7.62×39 |
| HK SP5 / MP5 Platform | 9mm Luger |
| CZ Scorpion PCC | 9mm Luger |
| FN PS90 | 5.7×28 |
| Ruger 10/22 | .22 LR |
What Ammo Does an AR-15 Use?
The AR-15 is one of the most popular rifle platforms in the United States. Most AR-15 rifles use 5.56 NATO or .223 Remington ammunition.
Many shooters choose AR-15 ammunition for:
- Range training
- Target shooting
- Competition
- General rifle practice
Popular AR-15 ammo options include:
- 55 grain FMJ range ammunition
- 62 grain loads
- Bulk 5.56 NATO ammunition
- .223 Remington training rounds
When buying ammunition for an AR-15, always confirm whether your rifle is chambered for .223 Remington, 5.56 NATO, or .223 Wylde.
Shop:
Bulk 5.56 Ammo
Bulk .223 Ammo
What Ammo Does a Draco AK Pistol Use?
The Century Draco AK pistol uses 7.62×39 ammunition, the same cartridge commonly associated with AK-47 rifles around the world.
Draco owners often choose 7.62×39 ammo because it provides:
- Reliable performance
- Affordable range shooting
- Wide ammunition availability
- Compatibility with the AK platform
Popular options include:
- 7.62×39 FMJ range ammunition
- 123 grain loads
- Bulk 7.62×39 cases
Buying bulk ammunition is popular among AK owners because these firearms are commonly used for high-volume shooting.
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Bulk 7.62×39 Ammo
What Ammo Does an HK SP5 or MP5 Use?
The HK SP5 and MP5 platform use 9mm Luger ammunition.
These firearms are known for their smooth shooting characteristics and are commonly used for:
- Range training
- PCC competitions
- Recreational shooting
Popular ammunition choices include:
- 115 grain FMJ
- 124 grain FMJ
- 147 grain subsonic loads
Many MP5-style firearm owners purchase 9mm ammunition in bulk because these platforms are designed for frequent shooting.
Shop:
Bulk 9mm Ammo
What Ammo Does a CZ Scorpion Use?
The CZ Scorpion PCC uses 9mm Luger ammunition.
Because of its low recoil and affordable operating cost, the CZ Scorpion is a popular choice for recreational shooters and PCC competitors.
Common ammunition choices include:
- 115 grain FMJ range ammo
- 124 grain FMJ training ammo
- Bulk 9mm ammunition
For frequent range use, purchasing larger quantities can help reduce the average cost per round.
Shop:
Bulk 9mm Ammo
What Ammo Does an FN PS90 Use?
The FN PS90 uses the specialized 5.7x28mm cartridge.
The 5.7x28mm round was designed for compact firearms like the P90 platform and offers a lightweight, high-velocity option for shooters who want something different from traditional rifle and handgun calibers.
Popular 5.7×28 ammunition includes:
- Federal American Eagle 5.7×28
- FN factory ammunition
- Premium defensive 5.7×28 loads
Because 5.7×28 is a specialty cartridge, many PS90 owners purchase ammunition when availability is strong.
Shop:
Bulk 5.7×28 Ammo
What Ammo Does a Ruger 10/22 Use?
The Ruger 10/22 uses .22 LR ammunition.
The 10/22 is one of the most popular rimfire rifles because it is affordable to shoot, easy to customize, and enjoyable for beginners and experienced shooters.
Common .22 LR ammunition choices include:
- 40 grain standard velocity loads
- High-velocity rounds
- Target ammunition
- Bulk .22 LR packs
Because .22 LR ammunition is inexpensive compared with centerfire cartridges, many shooters buy thousands of rounds for regular practice.
Shop:
Bulk .22 LR Ammo
Choosing the Best Ammo for Your Shooting Needs
The best ammunition depends on how you use your firearm.
For Range Training
Most shooters choose reliable FMJ ammunition because it provides an affordable option for high-volume practice.
For Competition
Competitive shooters often select ammunition based on reliability, accuracy, and consistency.
For High-Volume Shooting
Buying bulk ammunition can help lower the average cost per round and reduce the need for frequent purchases.
For Specialty Firearms
Platforms like the FN PS90 and other less common firearms may require planning ahead because specialty calibers may have fewer options available.
Why Buy Ammo in Bulk?
Many firearm owners choose bulk ammunition because it provides several advantages:
- Lower cost per round
- Fewer trips to purchase ammunition
- More consistent training supply
- Better preparation for regular shooting
Whether you shoot an AR-15, AK pistol, PCC, or rimfire rifle, buying the correct ammunition in larger quantities can make range time more convenient and affordable.
Frequently Asked Questions About Firearm Ammunition
How do I know what ammo my gun uses?
Check the caliber marking on your firearm barrel, slide, receiver, or manufacturer documentation. The marking identifies the cartridge your firearm is designed to use.
Can different guns use the same ammunition?
Yes. Many firearms share the same caliber. For example, Glock pistols, HK SP5 platforms, and CZ Scorpion PCCs commonly use 9mm ammunition.
What are the most common firearm calibers?
Some of the most popular ammunition types include 9mm, 5.56 NATO, .223 Remington, .22 LR, 7.62×39, .308 Winchester, and .45 ACP.
Is buying bulk ammo cheaper?
In many cases, purchasing larger quantities lowers the average cost per round compared with buying smaller boxes.
What is the best ammo for my firearm?
The best ammunition depends on your firearm, intended use, and shooting goals. Reliable range ammunition is often the best choice for regular training.
Find the Right Ammo for Your Firearm
Choosing ammunition starts with knowing your firearm’s caliber. Once you identify the correct cartridge, you can compare different loads, brands, and quantities to find the best option for your needs.
Bulk Ammo To Go makes it easier to find popular ammunition for today’s most common firearms, including AR-15 rifles, AK platforms, PCC firearms, handguns, and rimfire rifles.
Explore our ammunition selection and find the right rounds for your firearm.