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SF_Chewy · June 5th, 2014, 13:30

I've had the aluminum nozzle since they came out. Here are my thoughts:

The NPAS in the aluminum nozzle is different from the one for the plastic nozzles. I believe in fact the adjustment is also backwards.
I, by far, have had the most consistency with the plastic nozzle + NPAS (+/- 5 FPS on a great day)
Saying that, I've broken many plastic nozzles, some with just 5 shots. At one point I went through one each time I went out.
My RA-Tech aluminum nozzle was HORRIBLE out of the box. I was getting +/- 100 FPS!!!!! This was due to a terrible design of the NPAS.
I did not use the aluminum nozzle until I found an "upgrade" (more like paid fix) for it which replaced the cup and spring for the NPAS. This fix greatly changed my FPS fluctations, now I'm getting +/- 10 FPS
I believe (not 100% sure) that the new RA-Tech nozzles have a new cup and seal design.
The way to tell is if you disassemble the new nozzle, the proper spring has a taper on it and is stronger, whereas the old one has a linear spring (no taper). The cup looks about the same as the old cup. Again I'm not 100% if the new nozzles have this or not. Whether it has it or not, to make this nozzle efficient, you NEED it. It is a $9 USD upgrade if you do not have it.
After I installed the upgrade I was able to get 400 FPS on 0.25's consistently, and down to about 320ish with it mostly closed
I've used the same hop up rubber that I've had (A+ hop up I believe) since the beginning (through all the regular nozzles and now the aluminum nozzle) and the wear after a year or so is slightly noticeable, but my performance hasn't changed too much in terms of hop.
The RA-Tech nozzle comes with some sharp edges and I recommend filing them down to reduce the amount of wear on the gun and your mags.
You'll notice kick is harder, but cycling is slower (weight of the nozzle)
Efficiency-wise I think the aluminum nozzle loses quite a bit because of the weight, but I'm not sure on this either. I also have a steel bolt so my efficiency is poop.

Also perhaps you may be adjusting your NPAS incorrectly, as fully open I have no problems shooting over 400 with my plastic nozzle.

June 5th, 2014, 13:30	#3
SF_Chewy Trader rating Join Date: Mar 2010	I've had the aluminum nozzle since they came out. Here are my thoughts: The NPAS in the aluminum nozzle is different from the one for the plastic nozzles. I believe in fact the adjustment is also backwards. I, by far, have had the most consistency with the plastic nozzle + NPAS (+/- 5 FPS on a great day) Saying that, I've broken many plastic nozzles, some with just 5 shots. At one point I went through one each time I went out. My RA-Tech aluminum nozzle was HORRIBLE out of the box. I was getting +/- 100 FPS!!!!! This was due to a terrible design of the NPAS. I did not use the aluminum nozzle until I found an "upgrade" (more like paid fix) for it which replaced the cup and spring for the NPAS. This fix greatly changed my FPS fluctations, now I'm getting +/- 10 FPS I believe (not 100% sure) that the new RA-Tech nozzles have a new cup and seal design. The way to tell is if you disassemble the new nozzle, the proper spring has a taper on it and is stronger, whereas the old one has a linear spring (no taper). The cup looks about the same as the old cup. Again I'm not 100% if the new nozzles have this or not. Whether it has it or not, to make this nozzle efficient, you NEED it. It is a $9 USD upgrade if you do not have it. After I installed the upgrade I was able to get 400 FPS on 0.25's consistently, and down to about 320ish with it mostly closed I've used the same hop up rubber that I've had (A+ hop up I believe) since the beginning (through all the regular nozzles and now the aluminum nozzle) and the wear after a year or so is slightly noticeable, but my performance hasn't changed too much in terms of hop. The RA-Tech nozzle comes with some sharp edges and I recommend filing them down to reduce the amount of wear on the gun and your mags. You'll notice kick is harder, but cycling is slower (weight of the nozzle) Efficiency-wise I think the aluminum nozzle loses quite a bit because of the weight, but I'm not sure on this either. I also have a steel bolt so my efficiency is poop. Also perhaps you may be adjusting your NPAS incorrectly, as fully open I have no problems shooting over 400 with my plastic nozzle.