RS parts compatibility chart

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Postby old_Hades on Thu Jan 15, 2009 6:37 am

There is no Real steel OUTER barrel, there is just A barrel.
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Postby Cartman on Thu Jan 15, 2009 9:17 am

A real barrel will physically fit the upper but you can't fit an inner barrel(as per Hades above) inside it.
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Postby smokenghosts on Thu Jan 15, 2009 7:09 pm

Yea, It was a long night I don't know why I said that. It's too bad though would be awesome to fit my ptw with my barrel
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Postby Crenna on Thu Jan 29, 2009 9:29 pm

You can fit an inner barrel inside the real one, if you drill the inner diameter of the real barrel enough. Easier way to get the visible part of the real barrel is to cut PTW outer barrel somewhere inside handguard and weld a part of real barrel as a replacement.

Here's a pic of my A1 project with real A1 barrel:


I don't really see any point to do this with A2/M4 barrels, but older ones are another matter since there are no aftermarket A1 style barrels available.
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Postby JoeyJackhammer on Tue Apr 28, 2009 6:58 pm

Magpul ASAP fits, but requires a stopper of some kind to prevent the buffer tube alignment key from falling into the lower receiver. I used a foam ear plug that I cut in half.
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Re: RS parts compatibility chart

Postby rackcitymitch on Mon May 13, 2013 9:27 am

thank you!
I didnt know about the pistol grip
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Re: RS parts compatibility chart

Postby n1ch0 on Sun Aug 11, 2013 1:09 pm

Just want to add Larue APEG pistol grip won't work in a PTW. Its too short to cover the motor
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Re: RS parts compatibility chart

Postby ekolesov on Tue Jan 07, 2014 12:24 am

Thanks much for this chart! It's very helpfull :)
Sorry for my English
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Re: RS parts compatibility chart

Postby jungley on Tue Jan 20, 2015 5:15 am

I would change "Compensator" to "Muzzle attachments (e.g., muzzle break, flash suppressor, compensator)"

Systema PTW thread is M14x1.0 (or M14-1.0) clockwise.
In this notation, this means it uses metric convention, with 14mm nominal outer diameter of bolt, and 1.0mm thread pitch.

More info can be found here: ... d_777.html

The real-steel thread is 5/8x24 tpi clockwise.
These are imperial units, and means 5/8 inch nominal outer diameter, 24 turns per inch.

Simply converting between metric and imperial, we find that the PTW is approximately equivalent to: 0.551181… x 25.4 tpi. Conversely, the real-steel is approximately equivalent to M15.875x1.05833 in metric units. I say approximate because there are more decimal places, but also because there are other conventions between metric vs imperial threading such as thread depth and thread angle that are also different.

Based on these numbers, the "hole" in the real-steel flash hider is almost 2mm too large. This means it is easy to re-tap an Airsoft flash hider for real-steel thread, but a special thread insert is needed to convert a real-steel to Airsoft.

I don't think that such a thread insert currently exists on the market, so you would need to make one yourself. To start with, you would need a hunk of steel, and then you would also need the following:

5/8" - 24 Right Hand Thread Die 5/8 - 24 TPI (for $15) ... thread+die

14mm X 1 Metric HSS Right Hand Thread Tap M14 X 1.0mm Pitch ($20) ... thread+tap
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Re: RS parts compatibility chart

Postby michaellennox on Sat Nov 10, 2018 11:28 pm

The only recommendation is to remember to put the dust cover on before you put the barrel nut on. Many people keeps forgetting to do this.
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