Technical information

Practical A.E.G Upgrade 2006

How to improve accuracy with short barrel?

Can a long barrel deliver higher accuracy and range?

Why (and why not) should I replace the stock cylinder when using a

longer inner barrel?

With a short inner barrel, the only way to achieve better bullet stability is to use

heavier BBs such as 0.25g. At the stock power level, you should not use anything

heavier than this. You will also need to use a slightly stronger spring to

compensate for the drop in FPS due to the heavier BBs. A M120 spring can

sustain 0.30g perfectly, while a M130 (or above) spring can drive 0.4g and

produce great impact.

In terms of accuracy, a long inner barrel can always make a visible difference. In

terms of range, at the stock level the difference is minimal, while at 400FPS or

above you will start to see greater differences.

Every time the piston is pulled backward by the sector gear, air is being sucked

into the cylinder. When the piston is pushed forward by the spring, air inside the

cylinder is compressed for propelling the bullet. The amount of air available for

compression is essential. With a longer barrel, more compressed air is required

to move the bullet out of the barrel. This is why you may need extra capacity

within the cylinder for accommodating a greater amount of air.

The suck-back problem?

If you upgrade to a longer barrel without installing a matching cylinder,

suck-back MAY occur.

It is believed by some airsofters that suck-back can occur if the piston retracts

before the bullet has completely left the barrel (the so called “vacuum effect”