Airsoft Canada - View Single Post - WETTI/AWSS - M4/SCAR/HK416

m102404 · September 28th, 2009, 09:31

An update ago I noted that I had received the "new" "WE M4 CO2 upgrade nozzle" instead of the older slim version that I had received with my M4. The new one looks just like the scar nozzle (longer rod though) and just like Hata's pics of the RA Tech NPAS (minus the adjustment bit).

I swapped in the new chamber that matches the nozzle profile and things seemed to work just great.

However....my nozzle is toast. I'm not 100% sure how, but the thin section by the inlet cutouts have collasped and the nozzle is toast. I suspect that it was more from a jam, where then the nozzle/bolt came smashing into it and the thin stand-offs of the nozzle couldn't take the strain. I kind of wonder if the overall length was too long....but unfortunately I didn't take any measurements of it to compare against my original setup....I kind of doubt that though, they seemed to be a nice fit.

If you look at Hata's pics, you'll note that the plastic tube spacer is missing from the assembly (probably since for the upgrade kit you need to use your stock one from the original assembly). You can see the opaque spacer in my pics back in one of the first posts of this thread.

I think that the length of that spacer is quite critical. It ensures that the nozzle is kept far enough forward so that the nozzle is firmly sealed/seated into the chamber. Obviously if the nozzle was allowed to sit back when the rifle fired, a lot of gas pressure would be lost.

In the event of a jam...the metal nozzle is forced forward by the bolt spring and has the weight/heft of the bolt assembly riding with it. That's enough to smash/crush bbs...and I suspect that if there's no give in the particular jam, the nozzle could suffer damage (as mine did).

So if the objective is to keep the nozzle pressed firmly forward...yet have some give in the event of a jam so the nozzle isn't damaged...then it might be an idea to replace the solid plastic spacer with firm but yeilding rubber.

I might try a bit of rubber tubing, rubber washers, or even a disk of sorbo type material on the next nozzle that I get.

September 28th, 2009, 09:31	#12
m102404 Tys Trader rating Join Date: Apr 2006 Location: Toronto	An update ago I noted that I had received the "new" "WE M4 CO2 upgrade nozzle" instead of the older slim version that I had received with my M4. The new one looks just like the scar nozzle (longer rod though) and just like Hata's pics of the RA Tech NPAS (minus the adjustment bit). I swapped in the new chamber that matches the nozzle profile and things seemed to work just great. However....my nozzle is toast. I'm not 100% sure how, but the thin section by the inlet cutouts have collasped and the nozzle is toast. I suspect that it was more from a jam, where then the nozzle/bolt came smashing into it and the thin stand-offs of the nozzle couldn't take the strain. I kind of wonder if the overall length was too long....but unfortunately I didn't take any measurements of it to compare against my original setup....I kind of doubt that though, they seemed to be a nice fit. If you look at Hata's pics, you'll note that the plastic tube spacer is missing from the assembly (probably since for the upgrade kit you need to use your stock one from the original assembly). You can see the opaque spacer in my pics back in one of the first posts of this thread. I think that the length of that spacer is quite critical. It ensures that the nozzle is kept far enough forward so that the nozzle is firmly sealed/seated into the chamber. Obviously if the nozzle was allowed to sit back when the rifle fired, a lot of gas pressure would be lost. In the event of a jam...the metal nozzle is forced forward by the bolt spring and has the weight/heft of the bolt assembly riding with it. That's enough to smash/crush bbs...and I suspect that if there's no give in the particular jam, the nozzle could suffer damage (as mine did). So if the objective is to keep the nozzle pressed firmly forward...yet have some give in the event of a jam so the nozzle isn't damaged...then it might be an idea to replace the solid plastic spacer with firm but yeilding rubber. I might try a bit of rubber tubing, rubber washers, or even a disk of sorbo type material on the next nozzle that I get.