RVAs?

[cmw0081]

SO is an RVA worth it? How do you setup the to VA's with a rVA and an FVA?

[Medina]

Yes, an RVA is worth it. It helps with your consistency. I have my FVA flush with the inside of the tube, and my RVA is turned in a lot (I don't know how to explain it other than it being screwed almost all the way in). When you have both I noticed that tuning the FVA makes big changes in velocity, while the RVA makes minute changes.

I ran nitro this past sunday and my velocity was within 1-5 fps taking 10 shots at the chrono.

[MerrSonn]

Agreed, RVAs are definitely worth it. They make fine-tuning velocity much easier and increase efficiency (slightly, but every bit helps). I really like my JCS RVA, and it only set me back $15 or so.

[Trigga Nometry]

I have tried both the DOP and the JCS RVA's on the A-5. Both worked perfectly and gave the same type of results the guys above me are reporting. I felt that the JCS was better built and easier to work with. The RVA really lets you fine tune the performance of the A-5.

[deluxestogie]

My experience with the DOP and JCS RVA's led me to conclude that the JCS is a sturdier procuct, as others have stated. Also, the thread pitch on the setting screws is finer on the JCS, allowing a little more sensitive adjustment, and less likelihood that it will unscrew itself.

On the DOP, I've had the lock grub screw loosen, allowing the setting screw to unscrew itself. Since the setting screw on the DOP is the same diameter as the spring, that worries me. On the JCS, there is a nylon locking screw that simply applys continuous pressure, preventing the setting screw from turning. On both of them, a tiny Allen wrench needs to be handy at the chrono stand.

[SilentDeath]

Now lets say the nylon locking screw on the JCS RVA is torn to shreds (let's say, from a frustrated owner with a flathead screwdriver), is that RVA done for? Or is there a way to remove and replace that nylon screw?

[jmstallard]

silentdeath said:

Now lets say the nylon locking screw on the JCS RVA is torn to shreds (let's say, from a frustrated owner with a flathead screwdriver), is that RVA done for? Or is there a way to remove and replace that nylon screw?

I feel your pain brother....almost. I stuck a screwdriver in mine but stopped just short of damaging it when I saw that it was soft. As long as it's still adding pressure, you should be fine.

I have no idea how you'd replace one.

[deluxestogie]

With the JCS, you shouldn't need to touch the nylon set screw once it's tightened enough to apply pressure to the setting screw. Just leave it that way so that it adds friction to the rotation of the setting screw. It doesn't actually "lock" it.

If it's really trashed and is not snug against the setting screw, you may need to use a tiny easy-out to remove it. Automotive shops have various sizes, and may have one that small. If it's a mess and you can remove it, give JCS a call at 800-518-2200 (Web site), and they'll probably just send you one for free.

[SilentDeath]

Oh, so "my friend" shouldn't have tampered with that nylon screw in the first place? haha
I..uh, I told him not to play around with it. But he didn't listen.. you know, damn know-it-all's..

Okay, joking aside.. my nylon screw is still in there and still applying the friction. I only tried to loosen it because I found the set screw to be a little too tight, so I figured I'd loosen the nylon screw just a bit so I can freely adjust my velocity, and I'd retighten the nylon screw when I'm done. Learned the hard way and didn't have a manual.

So, as long as the nylon screw is still snug in there, I should be fine?

[deluxestogie]

Your friend should be fine. JCS (Blackpoint Engineering) is a group of talented engineers, but they get kind of a C- for writing documentation. There are similar nylon screws on the JCS trigger, and are basically ignored in the documentation.

[flyboy]

Im' going to be ordering an RVA soon. Is there a certain size screw I can replace the FVA with and be done with it? or is backking it out the best option?

[Vashthestampede]

JCS makes a powertube that has the front velocity screw deleted. Or you could back the fva screw out so that its flush with the powertube and just loctite it in place.

[flyboy]

thanks, I'll look for the power tube too.

[feltoid]

you need a 5/16 -24 x 1/4 inch long allen screw

[scphantom9195]

Be careful using Loctite on plastic. I tried that once, and the plastic crumbled apart. Not sure what type of plastic I was working with though.