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The Echo1 Red Star IGOR has a proprietary air nozzle. But this air nozzle is not air sealed with an o-ring, therefore is a candidate for upgrade. It's unlikely Echo1, or actually S&T (Echo1 and AY are rebrands), would design a completely new air nozzle for this VSS Vintorez airsoft gun. It's likely that the air nozzle comes from a different airsoft set-up.
I have an APS V2 air seal nozzle, so I compared the IGOR air nozzle to it. From the photo below, you can see that the IGOR air nozzle's external diameter is a little bigger than the V2 air nozzle. But the internal diameter is exactly the same, because the V2 air nozzle o-ring fits like a glove on the IGOR cylinder head. It also integrates with the tapper plate just fine.
Attached Image: 
APS V2 vs. IGOR Air Nozzle Diameter.jpg
Jake
Thu, 31 Jul 2014 00:50:36 +0400
The V2 air nozzle is also a little bit longer than the IGOR air nozzle (see photo below). However, I found that the IGOR dry fires fine with this V2 air nozzle when assembled. It still creates a tight seal with the rubber bucking when firing. But the longer air nozzle blocks the hop-up BB feeding tube a little. Therefore, BB cannot freely enter the hop-up chamber with the V2 air nozzle. So the V2 air nozzle will not work in the IGOR.
By the way, if you haven't figured it out already, the stainless steel nozzle is the APS. The translucent nozzle is IGOR.
Attached Image: 
APS V2 vs. IGOR Air Nozzle Length.jpg
Jake
Thu, 31 Jul 2014 00:52:40 +0400
Ok, so maybe the Echo1 Red Star IGOR's air nozzle is not that proprietary. I just received the Hawk Arms AK Short Air Seal Nozzle. It is practically an exact match to the IGOR air nozzle. I installed it and increased the FPS by 10.
The photo below shows the diameter of the two air nozzles.
Attached Image: 
V3 Air Seal Nozzle vs. IGOR Air Nozzle Diameter.jpg
Jake
Mon, 04 Aug 2014 03:38:32 +0400
In the following photo, you can see that the length are exactly the same.
Attached Image: 
V3 Air Seal Nozzle vs. IGOR Air Nozzle Length.jpg .jpg
Jake
Mon, 04 Aug 2014 03:40:08 +0400
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Title: Does Echo1 Red Star IGOR Use Version 7 Cylinder Head?
Weblog: Airsoft SpecOps
Excerpt: I finally took apart my Echo1 Red Star IGOR last night to upgrade it. It has a version 3 gearbox, but the cylinder head is not version 3. I have attached the photo below. Scouring the Internet, I noticed that it looks very similar to the veraion 7 cylinder head. I don't have a V7 cylinder head to co . . .
Tracked: Thu, 31 Jul 2014 01:22:02 +0400
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