C-Mag AK 40 Round steel magazine

Overview

The C-Mag 40 Round steel magazine is a curved, high-capacity box magazine built for the AK-47 and AKM family of rifles chambered in 7.62x39mm. It follows the same profile that has fed Kalashnikov-pattern rifles since the 1950s: a stamped and welded steel body with the familiar rib pattern down the front face, holding forty rounds instead of the standard thirty for shooters who want more rounds between reloads on the range or in the field.

Steel magazines like this one remain the benchmark against which polymer and bakelite AK magazines are measured, because a well-made steel body resists cracking under hard drops and rough handling in a way that plastic sometimes does not. The trade-off is weight: a loaded 40-round steel magazine is noticeably heavier on the belt or in a chest rig than an equivalent polymer unit, and the extra fifteen centimetres of curve compared to a 30-rounder makes it a poor fit for prone shooting from a bipod unless the shooter adjusts their support hand position.

This is a straightforward, no-frills magazine rather than a boutique accessory: it is bought for reliability and round count, not for tactical styling. Buyers comparing it against Bulgarian, Russian or Chinese surplus steel 40-rounders will find broadly the same dimensions, finish and feed geometry, since the 7.62x39mm AK magazine well and cartridge stack have never really changed across manufacturers.

Key Features

• Forty-round steel body gives thirty-three percent more capacity than a standard AK-47 magazine, cutting the number of reloads needed during extended range sessions or culling work.
• Stamped steel construction with welded seams and a ribbed front face adds stiffness to the feed lips and body, so the magazine holds its shape after repeated insertion and removal.
• The curved profile follows the natural taper of the 7.62x39mm cartridge stack, which keeps feeding reliable right down to the last round instead of binding as the case taper changes through the magazine.
• A protective external finish over the steel resists surface rust and everyday handling marks better than bare metal, though it still needs the same oiling routine as any other steel AK magazine kept in a humid climate.
• The magazine catch lug and feed lips are machined to the same tolerances used across the AK platform, so it drops into AK-47, AKM and most 7.62x39mm AK-pattern rifles without needing to be filed or fitted.
• A witness hole pattern on the rear face lets the shooter gauge remaining rounds at a glance, useful when running the magazine dry in training rather than in a fixed-count drill.

Technical Specifications

Materials & Construction

The body is stamped from sheet steel and joined along a rear seam, the same construction method used on original military-pattern AK magazines since the 1950s. Ribbing pressed into the front face stiffens the shell and helps the magazine keep its curve under the load of forty rounds. Feed lips are formed from the same steel rather than a separate insert, which is standard for this class of magazine and means minor lip damage from a hard drop can usually be straightened rather than needing replacement. A dark protective coating over the bare metal cuts down on surface rust, but any coated steel magazine will still show wear at the base and along the ribs where it contacts the magazine well repeatedly.

Fit & Compatibility

This magazine is built to the 7.62x39mm AK magazine well and will drop into AK-47, AKM and the great majority of 7.62x39mm AK-pattern rifles from Russian, Bulgarian, Romanian, Chinese, Egyptian and similar production lines, since the magazine catch geometry has stayed consistent across the platform. It is not interchangeable with 5.45x39mm or 5.56x45mm AK-pattern rifles, which use a narrower magazine body, and it will not fit AK platforms converted to accept AR-15 magazines. Because of the extra length over a 30-round magazine, shooters using a folding stock or shooting from a low prone position may find the extended curve contacts the ground or support surface before the standard 30-rounder would.

Care & Maintenance

Steel magazines reward a five-minute clean after a range day: wipe down the body, run a dry patch through the follower channel, and put a light film of oil on the feed lips and spring to keep surface rust from starting, particularly on the coast where salt air accelerates corrosion. Store magazines unloaded or at reduced capacity for long-term storage to keep spring tension consistent, and strip the follower and spring out periodically to check for grit or corrosion building up in the base. A stiff spring and a clean follower channel do more for reliable feeding over the magazine's life than any amount of coating on the outside of the body.

Who It's For

This magazine suits AK owners who want more rounds on tap for range sessions, culling or plinking without stepping up to a drum magazine, and who prioritise a magazine that survives being dropped in the dirt over one that minimises weight. It is not the first choice for a shooter running prone drills from a bipod, where the shorter 30-round magazine sits closer to the ground, or for anyone who wants the lightest possible loadout on a chest rig.

FAQ

Will this fit my Vektor R4 or R5? No. Vektor R4/R5 rifles use the 5.56x45mm AK-derived magazine well, which is narrower than the 7.62x39mm body this magazine is built to.

Does it fit AKM rifles as well as the original AK-47? Yes, the 7.62x39mm magazine well is common to both, along with most later AK-pattern variants in the same calibre.

Is a 40-round steel magazine reliable compared to a 30-round one? Reliability comes down to spring condition and clean feed lips rather than round count; a well-maintained 40-rounder feeds as reliably as a 30-rounder of the same build quality.

Can the spring be replaced if it weakens? Yes, the follower and spring are a standard AK-pattern assembly that can be stripped from the base plate and replaced without special tools.