CCI No. 34 Primers – Military-Grade Large Rifle Primers for 7.62mm Ammunition

CCI No. 34 Primers – Military-Grade Large Rifle Primers for 7.62mm Ammunition

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Manufacturer

• CCI (Cascade Cartridge Inc.)

  • Founded in 1951 and based in Lewiston, Idaho, USA.

  • Industry leader in primers, rimfire ammo, and reloading components.

  • A division of Vista Outdoor, which also owns Federal, Speer, and RCBS.

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Product Overview

The CCI No. 34 primer is a military-style large rifle primer specifically engineered for semi-automatic rifleschambered in 7.62 NATO / .308 Win and other similar rounds.

It features a hardened primer cup and a military-spec priming mix to help prevent slamfires and ensure reliable ignition in semi-auto and full-auto firearms with free-floating firing pins, such as:

• M1A / M14

• AR-10 / LR-308

• FN FAL

• G3 / HK91

• M1 Garand (.30-06 version also applies)

• Other 7.62 NATO battle rifles

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Key Specifications

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What Makes CCI No. 34 Primers “Military”

1. Thicker Cup

   • Prevents accidental ignition from free-floating firing pins, especially during chambering in semi-auto or full-auto firearms.

2. Hotter Ignition

   • Capable of igniting ball powders and slow-burning powders common in military-style ammo.

3. Reduced Sensitivity

   • Specifically engineered to minimize slamfire risk—a dangerous unintended discharge that can occur when the bolt closes too forcefully.

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Best Applications

• Military Semi-Automatics & Battle Rifles

  • M1A/M14, FN FAL, HK91, PTR-91, AR-10s, etc.

• Match or Service Rifle Loads

  • Reloaders building mil-spec loads, including for Service Rifle competitions or vintage military matches.

• High-Reliability Ammo

  • Ideal when field reliability or extreme environments are a concern.

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Compatible Cartridges

⚠️ Not intended for low-pressure loads or bolt actions unless slamfire resistance is needed.

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CCI Primer Comparison Table

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Why Slamfires Matter

Slamfire: An unintended discharge that occurs when the firing pin hits the primer as the bolt closes, without trigger input.

• Especially possible in rifles with free-floating firing pins (e.g., M1A, M1 Garand, AR-style rifles).

• Using standard soft primers (like CCI 200 or Federal 210) in these rifles increases the risk.

• CCI No. 34’s hardened cup resists this and is strongly recommended for safe reloading in military semi-autos.

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Tips for Using CCI No. 34 Primers

• Seat primers firmly – ensure the anvil contacts the bottom of the primer pocket.

• Clean primer pockets thoroughly for consistent seating and ignition.

• Avoid light firing pin strikes – these primers are tougher and may not ignite if improperly seated or if firing pin energy is too low.

• Do not substitute standard large rifle primers if you’re using these in rifles like the M1A, M1, FAL, etc.

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Storage and Safety

• Store in original packaging, in a dry, cool environment.

• Keep away from static, flame, or sources of impact.

• Primers are classified as explosives—handle with caution and never attempt to modify them.

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Summary

The CCI No. 34 Large Rifle Primer is the gold standard for reloading military 7.62mm / .308 Winchester ammo in semi-automatic rifles. With a tougher cup, hot ignition, and military-grade reliability, it is ideal for avoiding slamfires and ensuring dependable cycling in battle rifles and service rifles.