RA-Tech NPAS Valve for KWA / KSC MP7 Airsoft GBB SMG Rifles

"Works fantastic in my KWA Masada 14.5". I have a TNT hop up unit, Bucking, Barrel and with the NPAS Completely open, it dropped my FPS to 400 with a .20 which is exactly where I wanted it to be at for outdoor play. It was originally shooting really hot, 520 with .28's so this lower flow NPAS for me is perfect. People were saying in previous reviews that it drops fps too low and I suppose that you could modify the NPAS to be thinner while not going too thin to hit the inner wall where the tool meshes to adjust it. Would be cool if RA-Tech made different diameters so that you could buy one that is high and low flow. All in all its a great product and people were saying that its too expensive but you have to keep in mind that for other guns an adjustable NPAS is the entire nozzle assembly which is usually double the price if not more, and since this should be compatible With the KWA LM4 as well (as I'm sure that the nozzles in the Masada and LM4 are very similar) this NPAS should work in that as well.

"MP7 - Works really well. I added some teflon tape to the screw to give it extra snugness to hold it's setting. The FPS range is similar to the CQB bolt, it's probably about 1.4J - 0.5J or roughly 350-250fps w/.20s

It's probably compatible with alot of KWA GBBs, but expect the max fps to drop by 50-minumum if your gun currently uses the rocket type valve.

"Gun used was a KWA M93r, internally is almost identical to the MP7.

Stock rocket valve: 360-390FPS

Aftermarket CQB valve: 320-350

NPAS: Maximum FPS: 260 Minimum FPS is 150 FPS.

As you can see that FPS range is kind of pointless, but very consistant. On a single mag, from start to finish the FPS only ranges by 10 FPS at most which is really good. The other valves had a range difference of 30 FPS from start to finish. I just wish the NPAS had a more useful stock adjustment range; but this can be compensated for with a shaving process; which is something I really don't want to do but I will if I have to.


Pros:

Easy to install
FPS is adjustable

Cons:

Really expensive, which sort of makes sense since this item has to be machined... but it is still very expensive.
FPS adjustment range is REALLY low...
FPS adjustment tool is also too short. I have to disassemble my slide to even use the tool; which isn't a big deal really. Just more things for me to pick at in the end.

"Used in a kwa mp7 with 275mm inner barrel. Stock rocket valve is up to 470-490 fps with my long inner barrel. Low power valve is around 270 fps. Too low.

Well this npas can "adjust" from too weak to push bbs out the barrel, to well below cqb fps requirements in the US. About 50 fps for bbs to exit the barrel, up to a max of 340 fps with a full tank of gas. Keep in mind that's with an inner barrel that's almost twice as long as stock lol.

With the stock barrel expect a MAX of 275 fps...