5KU Stock Guide for M4/M16 AEG Black

The 5KU Stock Guide for M4/M16 AEG Black is an aluminium stock guide for compatible M4- and M16-type AEG airsoft replicas. This component acts as the guide and mounting base for an adjustable M4-style stock and features 5 adjustment positions, allowing the length of the stock to be adjusted to suit the user and their preferred playing style.

The stock guide is made from aluminium and comes with a screw, washer and steel guide ring for fitting. Measuring 16.5 cm in length and weighing approximately 100 grams, it offers a compact aftermarket solution for replacing or upgrading the stock system of a compatible M4/M16 AEG.

Aluminium frame with 5 adjustment positions

The stock guide is made from aluminium, enabling the 5KU to combine a metal construction with a relatively low weight. The black finish complements most standard and custom M4/M16 configurations.

The guide has 5 adjustment positions. When used in conjunction with a suitable adjustable M4-style stock, this allows the length of the rear of the replica to be adjusted to several different positions.

A shorter stock length can be comfortable during CQB or when a compact stance is required. Conversely, a fully extended stock provides more distance between the shoulder and the receiver. Which position is most comfortable depends on your build, equipment and personal preference.

For M4/M16 AEG platforms

This 5KU Stock Guide is intended for M4/M16-type AEG airsoft replicas. It is therefore a component for electric airsoft replicas and not, by definition, a buffer tube for GBBR systems.

In an AEG, a stock guide serves a different purpose to the functional buffer system found in a gas blowback AR platform. In GBBRs, internal recoil and bolt components move in or around the buffer tube, whereas a traditional AEG does not require this design.

Although this part has been developed for M4/M16 AEGs, it should not be assumed that every AEG receiver uses the same mounting system. When replacing the part, therefore, always check the connection to the receiver and its compatibility with the stock being used.

Includes fitting materials

The stock guide comes with a screw, washer and steel guide ring. This means that key components for attaching the guide to a suitable replica are included.

The steel guide ring provides a metal component at the relevant fixing point, whilst the washer and screw are used to assemble the whole unit correctly.

During assembly, check that all parts fit correctly and without unnecessary tension. Over-tightening a fixing screw will not make a stock system any more secure if the parts have been fitted incorrectly; on the contrary, it may cause damage to the thread or the receiver.

Practical insights

An adjustable stock guide primarily affects the ergonomics and configuration of the replica. With five positions, the user can adjust the stock length to suit, for example, CQB, outdoor use, thick clothing or when wearing a plate carrier.

Before fitting, check not only the receiver compatibility but also the stock that is to be fitted over the guide. Not every aftermarket stock and every tube/guide has exactly the same internal diameter and tolerances. A small amount of play may occur with certain combinations, whilst another stock may fit too tightly.

If the AEG is rear-wired and the wiring runs towards the stock, you must also take into account the available space for cables and, where applicable, the battery. The product information provided does not specify the internal battery capacity, so you must check in advance whether the chosen battery and wiring are compatible with the final configuration.

Who is the 5KU Stock Guide suitable for?

The 5KU Stock Guide for M4/M16 AEG Black is suitable for players and airsoft technicians who wish to replace or repair the stock system of a compatible M4/M16 AEG, or use it as the basis for a custom build.

The aluminium construction and five adjustment positions make this component suitable for both standard M4 configurations and custom builds where an adjustable stock is required.

This component is not intended as a universal solution for every AR platform. Particularly in the case of GBBRs, non-standard receivers and replicas with proprietary stock systems, it is essential to check first which type of buffer tube or stock guide is required.

Specificaties

• Note: 5KU
• Producttype: Stock guide / buffer tube
• Platform: M4 / M16
• System: AEG
• Material: Aluminium
• Guide ring material: Steel
• Colour: Black
• Number of adjustment positions: 5
• Total length: 16.5 cm
• Width: 3 cm
• Height: 3.5 cm
• Weight: 100 g
• Adjustable: Yes
• Screw included: Yes
• Washer included: Yes
• Steel guide ring included: Yes
• Application: Airsoft / replacement part / custom M4/M16 AEG build

Contents of the pack

• 1x 5KU Aluminium Stock Guide
• 1x fixing screw
• 1x Washer
• 1x Stalen guide ring

Common mistakes

• Do not automatically assume universal compatibility with every M4/M16 AEG.
• Do not confuse this AEG stock guide with a functional GBBR buffer tube.
• Before fitting, check that the mounting is secure on the receiver.
• Check that the adjustable stock you are using is suitable for the dimensions of the stock guide.
• Do not force a rod if it is sliding too tightly over the guide.
• Do not overtighten the fixing screw.
• For a rear-wired AEG, check whether the wiring can run freely through or alongside the stock assembly.
• Do not automatically assume that there is sufficient internal space for every LiPo or NiMH battery.
• Please bear in mind that tolerances may vary between batches from different manufacturers.
• After fitting, check that the stock locks correctly in all five positions.

Frequently Asked Questions

What type of replica is this 5KU Stock Guide designed for?
The stock guide has been developed for compatible M4/M16-type AEG airsoft replicas.

What material is the stock guide made of?
The guide itself is made of aluminium. A steel guide ring is also included.

How many adjustment positions does the stock guide have?
The guide has 5 adjustment positions for a suitable adjustable M4-style stock.

How long is the stock guide?
The total specified length is 16.5 cm.

How heavy is the part?
The stated weight is approximately 100 grams.

Are the fitting components included?
Yes. According to the product information, a screw, washer and steel guide ring are included.

Will any M4 stock fit this stock guide?
This should not be automatically assumed. Dimensions and tolerances may vary between stocks and manufacturers. You should therefore check the compatibility of your chosen stock.

Can this stock guide be used on a GBBR?
This version is designed for AEG platforms. A GBBR uses a functional buffer system for its moving internal components and therefore places different demands on the buffer tube.

Can a battery be fitted into the stock guide?
The available product information does not specify a particular internal battery compartment or maximum battery dimensions. For a rear-wired AEG, it is therefore necessary to check in advance whether the chosen battery and wiring will fit within the final stock configuration.

Are the five positions part of the stock or the guide?
The stock guide has five adjustment positions. A compatible adjustable stock can be locked into these positions.

The 5KU Stock Guide for M4/M16 AEG Black features an aluminium construction with five adjustment positions and includes mounting hardware for replacing or fitting the stock system on a compatible M4/M16 AEG.