ACM M4/M16 Hi-cap magazine 300rd-Black - with key winder

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It's an M16 300 round hi-cap. It fits M16 & M4 variants.

It's an M16 300 round hi-cap. It fits M16 & M4 variants. It's cracking value for money. Buy several...

PLEASE NOTE: These mags are VERY tight in the KWA M4s - and we cannot therefore recommend these mags for those guns. For KWA rifles please choose the KWA 360 round M4 hi cap
Weight (Kg) 0.2190
Manufacturer Army Armament
ACM M4/M16 Hi-cap magazine 300rd-Black - with key winder
Great Beginner weapon
Review by
This is being used by my Son Luc and he really likes this weapon, its solid build and works well so far, we are going to our second airsoft meeting this sunday and will really start to but it through some harsh treatment :)

bottom line if your looking for a good beginner weapon then this is it. the stock FPS is about 250fps.

ACM M4/M16 Hi-cap magazine 300rd-Black - with key winder
good product
Review by
I've bought about 4 of these from here, does what it says on the tin. A good quality metal high cap mag with a winder at the bottom. Suitable for most M4 variants. Mine was bought for the G&G Toptech T4-18.
Important Information


All images, product contents and specifications listed are based on checks performed when a product is first listed and may differ due to changes over time made by the manufacturer. This includes package contents in regards to any 'extras' provided e.g. Sample BBs.

Items used in images to promote the main item (Holsters, Camo, etc) are not supplied unless listed in the Specification tab under 'Extras'. This includes attached rails, grips, scopes, suppressors etc. If no extras are listed, please assume none are supplied.

Unless otherwise stated in the Specification tab, Battery and Chargers are not suppplied.

Where supplied, Chinese batteries and chargers are warrantied to be not DOA (Dead on Arrival) only. We always recommend swapping out to a better quality battery and charger at the earliest opportunity.

Custom Painted products (Two-Tone) are non-refundable as these are painted to order. 

Unless otherwise stated, all products are sold singly.



Any figures used are based on tests performed on the products when they are first listed. These can vary due to changes by the manufacturer, gas pressure, gas used and a number of other factors. All figures should be treated as an approximate guide and used for reference only. 

All listed FPS are +/- 5% due to differences from rifle to rifle. If you require a guaranteed FPS, please add an upgrade/downgrade option on to your product (this may cost extra).

No airsoft AEG is warrantied for use with an 11.1v LiPo or higher voltage battery at UK velocities (373fps or lower) unless specifically recommended on the product itself. Use of higher voltage batteries can cause failures and will negate any warranty implied or otherwise.


Wearable Items

We cannot offer a refund or exchange on articles bought and worn skirmishing that you subsequently feel aren't suitable. If in doubt, try the kit on in your house BEFORE you play as soiled items will not be refunded for this reason. Clothing worn next to the skin (Long Johns, Socks etc) cannot be returned for refund if worn at all. For sizing, simply place them next to you before physically putting them on. Would you like to wear someone elses soiled socks?


We cannot offer an exchange on pyrotechnic devices due to device failure or items that have been stored for long periods of time. We are unable to guarantee that the pyrotechnic device has been stored in a moisture free environment or used correctly in accordance with the manufacturers guidelines.

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