SA M4 / AR15 Mid-Cap Magazine, 140 BBs – Tan

Specna Arms M4 polymer Mid-Cap magazine

This expert product description was prepared by the ANAREUS.cz expert team. All rights to this unique content are bound to the anareus.cz domain.Specna Arms Mid-Cap magazine is designed for electric airsoft guns based on the M4 / AR15 platform. The capacity of 140 BBs represents a compromise between ammunition capacity, reliable feeding and realistic reloading. The BBs are guided through an internal feeding channel and pushed towards the feed lips by a spring, so they do not rattle freely inside the magazine when moving as they do in a conventional Hi-Cap magazine. The magazine body is made from durable polymer, which keeps the weight of your gear low even when carrying a larger number of magazines. The magazine follows the STANAG design, so it fits perfectly into pouches for 5.56 calibre magazines (.223 Rem) while also being wider than slim S-MAG magazines. To load the Mid-Cap magazine, a speedloader is required, which is not included in the package.

Key features of the Specna Arms M4 Mid-Cap magazine

Capacity of 140 BBs

The magazine holds 140 airsoft BBs, so you do not need to reload as often.

Spring-loaded mechanism

BBs are fed by a spring inside the feeding channel, so the magazine does not need to be wound during firing and the BBs do not rattle freely inside.

Strong feeding spring

The high-quality spring is designed for reliable BB feeding and can also handle heavier ammunition.

Durable polymer body

Lightweight polymer and STANAG design make the magazine easier to handle and allow the use of pouches designed for 5.56 calibre magazines.

For M4 / AR15 AEGs

Universal magazine design for M4 / M16 / MK18 AEGs and other compatible AR15 platforms.

STANAG-style polymer magazine

The image shows a polymer magazine in the original STANAG 5.56 (M4) design in black.

Technical specifications

• Manufacturer: Specna Arms
• Series: STANAG M4
• Type: Mid-Cap magazine
• Capacity: 140 BBs
• Material: Polymer
• Feeding mechanism: Spring-loaded
• Winding: No
• Loading: Through the feed lips using a speedloader
• Designed for: AEG
• Compatibility: M4 / M16 / MK18 and other compatible AR15 AEG platforms

Warnings and recommendations for using a Mid-Cap magazine

• A speedloader is required to load the Mid-Cap magazine and is not included in the package.
• BBs are gradually pushed through the feed lips against the feeding spring using the speedloader.
• Do not use excessive force when loading, and once the maximum capacity has been reached, do not attempt to force additional BBs into the magazine.
• Before first use, we recommend gradually breaking in the spring.
• First load approximately 20 BBs and then release them from the magazine.
• Then load approximately 40 BBs and repeat the process in increments of roughly 20 BBs until full capacity is reached.
• This gradually loads the spring and internal feeding mechanism during the first cycles.
• After the game, always empty the magazine and do not store it with BBs inside for extended periods.
• A spring kept compressed for long periods may gradually lose its properties, which can later result in poorer BB feeding.

Package contents

• 1× Specna Arms polymer Mid-Cap magazine for M4 / AR15 (140 BBs)

Frequently asked questions from our store

Which is better, a Mid-Cap or a Hi-Cap?

Mid-Cap magazines offer quiet operation without rattling, smooth feeding and greater realism, making them a standard choice for tactically oriented games. Hi-Cap magazines can hold hundreds of BBs and are easy to load, but they rattle when moving and require periodic winding, making them more suitable for beginners and smaller games where more BBs are fired.

How do you load a Mid-Cap magazine?

You need a speedloader for loading. Place its loading nozzle against the magazine's feed lips and use the plunger to gradually push BBs inside against the feeding spring. The speedloader is not included in the package.

Do BBs rattle inside a Mid-Cap magazine?

Not like they do in a conventional Hi-Cap. In a Mid-Cap magazine, the BBs are guided through the feeding channel and held under spring pressure, so they do not move freely around a large storage compartment.

Can I store a Mid-Cap magazine loaded?

No, we recommend removing all BBs from the magazine after the game. This prevents the spring from remaining compressed for extended periods, helping to preserve its feeding performance and extend the service life of the magazine.

Does this magazine fit all M4-type guns?

The magazine is designed for standard M4 / AR15 AEG platforms and their variants, such as the M16 or MK18. Dimensional tolerances of magazine wells and feeding systems may vary between manufacturers, so 100% flawless compatibility with every existing model cannot be guaranteed. Based on our testing, however, it is one of the most universal magazines on the market.