Reproduced by kind permission of Project PTW.

“This blog examines common beliefs held about the PTW platform, which are actually completely wrong.

Barrel Nut Torque

You do not need to torque the PTW’s barrel nut. Like it or not, experience am bestest on this one.

A simple quotation from Geissele – manufacturer of *the* best rail system on the planet – says it all and says it well (stolen from The Reptile House Blog – hope you don’t mind, Rich!)”

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“However, what you *do* need to carry out this operation are the correct tools (not pipe grips and a tea towel), a vice and a receiver action block. Clamshell is best.


The PTW does not need to be modified to run on lipos. The PTW is lipo ready out of the box. The lipo mod is a space efficiency exercise, to ensure there is enough room in the stock tube for a battery when using the ASS-EL-01-M4 PTW FET.

Fire Selector

You do not need any special training to set the firmness of the fire selector’s movement. It is a personal preference, which I would recommend is set by the user. I like mine tight and firm. You may not. The grub screw seen here, on the top face of the gearbox, can be adjusted to set the pressure of the spring that detents into the selector switch.”

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“Be aware: don’t go too tight and don’t go too loose. Again experience am bestest, but don’t be afraid with a little experimentation. It’s your rifle, set it up to suit you.

Buffer Tube Shimming

Again, this is something I see as part and parcel of owning a PTW. It does not need to be set by an expert.

Some points to consider:

1. The cylinder should not move when the PTW is fired.

2. The receivers should close with a nice snap.

3. The shimming should not be so tight as to require excess force upon closing or opening.

4. The receiver should only be opened by hand (which, again, means the shimming shouldn’t be too tight)

5. You will only encounter FPS loss if the receiver doesn’t snap shut nicely, but over shimming will not increase FPS

6. The receiver should require reasonable force to open

Which leads to…


I like this one. With the standard receiver set, do not slap your PTW in any way to open it! You risk breaking it.

CNC receivers take more abuse and most serious PTW users will end up replacing that nasty Systema logo which shouts, “Look at my expensive toy gun. I am AMAZING!”

However, by this time I’d hope the user would have evolved into a caring, sensitive receiver opener. Particularly if slapping was what initiated the purchase of replacement CNC receivers.

Try this method below:”

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“1: Selector in SAFE. Rear Take Down Pin fully extracted.

2: Support the rifle in three places. The stock and buffer tube with leg and hand cradling thew buffer tube. The muzzle rests on the left foot. Thirdly pressure is applied to the charging handle and or the forward assist area.

3: The PTW will pop open gently and in a controlled manner. Adapt this method to however best suits you.

Moisture Proofing

No single form of moisture proofing will make a PTW waterproof. There is a clue in the name. However, moisture proofing done correctly will help no end.

Spray-on applications are a short cut. I will leave it at that.

Please do not email asking how its done properly.


Out of the box they still fail. If you do have one which lasts, without a rewind and modification, then you are lucky. Very lucky. This may seem like a ploy for business but the truth is, Systema motors have poorly wound cores with numerous faults.

Also, the motor *is* your grip. No matter how strong the sheath which we refer to as a grip, it will never relieve the stress applied to motor by the user during use. The grip is merely a vessel to protect the workings of the motor and look like the real thing.

“A dollop of grease in my gearbox is good practice…”

No, no it isn’t. The gearbox requires very little grease. Spooning more in as part of getting your kit ready for a game will end in tears.

“My PTW requires no looking after, it just keeps going…”

I doubt it, but good luck to you! Motor, mags, barrel and cylinder all need regular maintenance:

1. Clean your barrel after every game. Don’t damage the hop – wind it off while doing this.

2. Service your cylinder as often as you can afford.

3. Keep the holes clear in the sector gear – this is what the gun uses to sense a complete gearbox cycle.

4. Get your motor checked at least every 12 months. Likewise the gearbox.

Of course, the skeptical amongst you will be thinking I would say all of the above ;)”