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welcome to another episode of AIRSOFT REVIEWS HD
and here i have only one piston
on this episode we are going to talk about the SWISS CHEESE MOD on pistons
with this method we remove plastic mass from the piston which will make it more lightweight
after this modification the piston looks like swiss cheese
so lets see what is the swiss cheese mod and how it can be done by yourself
first of all keep in mind that this modification is worth only for AEG's that can shoot fast out of the box
or have already upgraded to shoot at least 25 rps
for AEG's that shoot less than 25 rps, this modification will not provide anything more than 1 or 2 rps
so cutting or drilling a piston on a slow rps AEG gearbox is not the best idea for upgrade
making a swiss cheese mod that will give you only max 2 rps is not the best result
but for those who want to create an ultra speed airsoft gun this modification is necessary
you can see my ultra speed m4 from the video link in the description
for the high speed modifications, 1 or 2 rps more are valuable
the swiss cheese mod is nothing more than mass removal from the piston
so the piston becomes more lightweight
so the motor can peak it up and pull it back fast
also the circle time will be reduced
but the most important improvement of lightweight piston is that it holds better its position on the gearbox
and the AOE is improved
better AOE means that the sector gear will engage the piston in the best way without damaging the teeth
for high rps rifles, a good AOE is necessary and without it the gearbox will fail
imagine how much stress can take the peak up tooth on a gearbox that can hit 35 or more rps
as i always say, there are many methods for the swiss cheese mod
and i will never admit that the way i show to you is the best way to do it
but after a good research and many applications on upgrades i have done, i believe that this methods are effective
there are many ways to apply the swiss cheese mod
i will tell you some popular ways to apply this mod
and i will show you how to do it with examples
but before that let me show you what kind of tools you will need for this modification
those are the tools you will need to apply the swiss cheese mod
you will need an electrical dremel
the most of them have rpm regulators
and of course some drills and sanding tools
you will need some sanding tools to remove the plastic that extents from the holes
because the piston surface must be smooth after the modification
also i suggest to get a mini vice to place the piston on so you can work easily
this mini vice can be easily installed even on a desk so you can hold the piston steady
so you can make linear holes without any mistakes
i will take this tools away now
and let me tell you a few words before starting the modification
so this is a classic army stock piston
its a polycarb piston with polycarb piston head
i suggest to remove the piston head before the modification
just loosen the screw from the inside of the piston and remove it
and then create your plan for the cutting or the drilling
there are many ways to remove plastic from the piston
the first plan is to drill many holes of different sizes on the piston
you can create different patterns of the holes
with small and many holes, two lines of holes or one line of big holes etc
before drilling you must know some basic rules
on this area which is close to the piston teeth i will suggest you to make only one line of small holes
i strongly suggest you not to remove to much plastic here because you will make the piston very weak
if you decide to create "windows" than holes
do not cut the piston on the teeth area
because this point takes the hole stress during operation of the gearbox
on the top part you can make many holes, windows etc
it depends of you patience
but always have in your mind that if you remove too much plastic you will make the piston very weak
but of course you will make it lightweight too
i will say that this modification is best for AEG's that shoot under 400 fps (.20g)
for AEG's over 400 fps you can only apply a few small holes to gain max 2 rps and make a better AOE
so the sector gear will engage the piston in the best way
for AEG's over 400 fps cutting the piston is a bad idea and it will propably brake
for AEG's less than 400 fps, like the cqb rifles
and you want to make it really fast you can apply the swiss cheese mod
(in our country we prefer semi fire in cqb games)
i have created a very fast rifle and you can see the results (link in the description)
and for such a fast rpm rate, you have to remove as much plastic as you can
of course you must not remove any plastic from the piston head and the teeth area
you can remove big pieces from the top (window cutting)
or circle pieces or you will drill it with many holes
always remove plastic symmetrically so the weight is balanced
create the same number of holes or cutting on each side
if the cutting is non symmetrical the weight balance will be bad and the piston position will be affected
lets start now the drilling example
of course you have to experiment with this modifications a lot
always keep in mind not to cut to much the piston because you will make it too weak
and it will finally fail
lets put the piston on the vice
we have the piston on the vice so it will be steady during the drilling
before starting, get all your tools close to you
also you must know that this modification will create too much dirt from the plastic of the piston
especially if you deside to drill the piston there will be too much plastic dirt
so you must be ready to clean your working space
i have installed a small drill on my dremel
i prefer to create many small holes and no big cuttings
i always take my time and work slowly to avoid any mistake that it will cost me a part
i will set my dremel on low rpm rate
i will hold the piston with one head to be steady and i will start the drilling
as i said, you can see the dirt that is produced
the classic army polycarb piston is tough so i will increase the rpm rate of the dremel
i try to keep same distance between holes
i have done a line with holes
on the top side of the piston, and i am really filled with dirt from the plastic
you can continue making holes next to this line i have done
at any pattern you want
or you can install a cutting rotor to cut windows
it depends on the type of the gearbox set up
and the final upgrade target
you can experiment in different types of cutting or drilling but be ready to sacrifice some parts
the more plastic you remove the more lightweight the piston becomes
in my opinion this modification will give good results only for low fps AEG's with high rof
and i will say that this modification will not give any upgrade to powerful AEG
like the woodland type rifles over 400 fps
the only advantage of swiss cheese mod in powerful airguns will be the better AOE
the better AOE is a very impartant upgrade but you must have a very durable
piston to apply swiss cheese mod in powerful AEG's
also you must experiment firstly in much lower fps AEG's to get critical experience for those modifications
before we end this episode let me show you one more thing
after the drilling you can see there are pieces of plastic stuck on and under the holes
its very important to smooth those plastic dirts on the surface of the piston
if you leave those dirts on the piston, they will fall in the gearbox during the operation
and they will cause problems in moving parts
the gearbox must be clean and lubricated inside so it will keep working for long time
so get a sanding tool on the dremel
and after you finish the drilling or cutting modifications smooth all the surfaces
apply soft forces on the piston surface with the sanding tool
and remove the dirt without sanding too much the surface
as you can see the dirt has been removed successfully
its very important to keep the surface clean and smooth
of course you must smoothen all the surfaces of the piston and i suggest to do that for the internal surface too
because the internal dirt or pieces of plastic will create problems on spring rotation
just imagine how fast all the internal parts of the gearbox are moving during operation
its just like a car engine, where everything must move smoothly and normally
having dirt, plastic pieces falling apart etc will create serious problems
do the smoothing also if you cut windows
all this kind of modifications need your patience
don't try to finish this modification as fast as you can
for the beginners you can practice on an old stock piston before doing it on an upgraded piston
so thats all for this episode
if you like that video subscribe to my channel
also check my other technical videos (links on description)
thanks for watching and see you on the next episode!
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