QB79 Ninja - The $200 PCP

[WECSOG]

Thanks, Mike. That sounds like a good plan of action.

[pllagunos]

I finally finished to mod my qb79 .177, my results are 690fps with the 10,5 CPUMs using the stock (850 psi) regulator  I actually wanted 12 fpe, but I am not going to complain since I haven't done any valve mods yet, and also I think my breach seal isn't set perfectly. What I did is removed the piercing pin and filter from the valve, enlarged the ports  to 9/64" along with the poly tubing seal, which was a pain to cut, also installed a RVA and the cock on open mod; I polished everything to a smooth finish and finally lubed with moly paste and silicone grease.

I can tell you guys, that it is a sweat shooter, it's accurate and has enough energy to dispatch small game at close distances and it is VERY fun to shoot.

[SpiralGroove]

Hey Pablo,
How many shots do you get per 213cc tank full?
Have you increased the bolt probe tip to 9/64"?
Are you getting 690 fps on the knee of the curve or at max. preload?

You only need another 25/30 fps to reach your goal of 12 fpe   The easiest thing to do would be to increase your set-point a tad - maybe 900/950 psi.

[pllagunos]

Hey Pablo,
How many shots do you get per 213cc tank full?
Have you increased the bolt probe tip to 9/64"?
Are you getting 690 fps on the knee of the curve or at max. preload?

You only need another 25/30 fps to reach your goal of 12 fpe   The easiest thing to do would be to increase your set-point a tad - maybe 900/950 psi.

Hey Kirk,
I am not sure how many shots per fill I get, I am going to make a full chorine one of these days, however I do know that it gives me a lot! I actually filled to 2100psi and the needle hasn't moved much even after 20shots for me it looks like the needle is at 1900psi however I will continue shooting and once I get to 1500psi I can get an estimate of my efficiency.

Yes I increased the bolt probe to 9/64", I am getting between 680-694fps, 685fps avg I would think... I am not sure if it's on the knee of the curve but it is close, definitely not at max preload, I tried to set the RVA where I can hear the valve opening in a more consistent way, kind of a quick snap.

I will try to increase the set point, however I don't have an output pressure device so that would be a main problem.

[mackeral5]

here is a good thread discussing regulator adjustment. 


http://www.gatewaytoairguns.org/GTA/index.php?topic=49648.20

[Kailua]

I'll probably try bending it a little more after all. I can't get the valve poppet to seal with my hand pump, so I'm gonna pull it all the way down again. So I guess I'll work on the barrel while it's out.

BTW, did I mention that the stock nut was stripped, out of the box? These things really are parts kits, in my experience. Don't get me wrong; I fully intend to make this a viable airgun, and am enjoying the process of doing so. But if I were like some of my fellow MPP consumers, I would have already written this thing off as a piece of junk and sent it back; and would now be telling everyone who would listen to save their money. 

And I'm not referring to the poppet seal problem; that one was my doing by choosing the wrong spring.

I had read a while back on the Flying Dragon website that the newer QBs are not as well make as the older guns. As you have mentioned these are project guns which can be fixed to perform better.

[SpiralGroove]

Hey Pablo,
If you pay to ship the Ninja regulator to me I can set it wherever you want.
Kirk

[Buldawg76]

Thanks, Mike. That sounds like a good plan of action.

Tracy

Not a problem and its frustrating to have a gun that shoot way off its mark so that a scope runs out of adjustment before getting close to the bulls. Like I said just go slow and shoot after every adjustment so you can see the change in POIs.

Mike

[jpsgunworks]

Does the tank with the pro SHP regulator just screw on or does the barrel have to be pulled ? With a regular Ninja
tank and regulator the gauge and fill nipple don't clear without taking the barrel off.  I want to carry extra tanks and
change them like you would a CO2 tank. Thanks.

[BigTinBoat]

Does the tank with the pro SHP regulator just screw on or does the barrel have to be pulled ? With a regular Ninja
tank and regulator the gauge and fill nipple don't clear without taking the barrel off.  I want to carry extra tanks and
change them like you would a CO2 tank. Thanks.

Won't work without a breech riser

[rsterne]

Unscrewing an HPA tank that still has 1000 psi or more in it will likely blow the O-ring on the ASA fitting.... Even though the QB tank block has a small vent hole to prevent this from being dangerous (not sure if the JDS one does?).... they are only designed to be unscrewed when a CO2 tank is empty and the pressure is very low.... You can fit an On-Off valve between the regulator and tank block which will then allow you to remove the tank (after firing the gun to depressurize the tank block).... but as the previous poster mentioned, you will need either a riser breech, or an offset (lower) block adapter.... to be able to unscrew the tank with the barrel in place.... Most guys just use a Pony Tank to top up the bottle on the gun....

Bob

[BigTinBoat]

Unscrewing an HPA tank that still has 1000 psi or more in it will likely blow the O-ring on the ASA fitting....

When I unscrew mine with 1500psi of regulated pressure I just unscrew the bottle 1 complete turn. I then dry fire a couple of times and the bottle easily unscrews without any pressure on it at all.

[bugg100]

I am thinking of trying a 79 out with the Ninja SHP, lots of great info here, thanks to all for sharing!

I haven't seen it referenced in this thread directly... So does the Ninja tank fit without interference of the barrel, or is an aftermarket tank block required? Not asking about removing the bottle, just curious about shooting conditions.

thanks in advance,
Joe

[BigTinBoat]

I am thinking of trying a 79 out with the Ninja SHP, lots of great info here, thanks to all for sharing!

I haven't seen it referenced in this thread directly... So does the Ninja tank fit without interference of the barrel, or is an aftermarket tank block required? Not asking about removing the bottle, just curious about shooting conditions.

thanks in advance,
Joe

Yes - the Ninja tank will screw on to the tank block w/i touching the barrel after installation.

[birdmove]

    Sorry, as I haven't read through this whole thread yet. The tank the original poster suggests, are they fillable with a hand pump, such as used on Crosman Discovery airguns?

    Thanks, Jon

[Buldawg76]

RAP4 Paintball.... http://www.rap4.com/p/019690/13ci-compressed-air-tank-cylinder-no-regulator-

Bob

Bob
I checked out the tank link you sent me again and the price is good till you get to the shipping which is 17 bucks so that it puts just the tank 3 bucks shy of a complete ninja tank and regulator off eBay with free shipping so likely will just go that route and resell the regulator that comes with the tank since my SHP is already set to 1100 psi output. I have one other question concerning velocity.

I am wanting the gun for FT use so am looking to shoot JSB 177 cal 10.34 grain pellets at 890 to 900 fps and am trying to decide on if I need the extra plenum volume of a QB78 as compared to the 79s plenum to achieve the fps I am after from the gun or would the smaller 79s plenum be enough to achieve my intended fps with just the bolt and valve mods of opening up the transfer port and removing the front of the valve nose or reducing its unneeded material.

I am really liking the AR2079 target gun for the stock but don't want to get it and have to do extensive mods to get the 890 to 900 fps with 10.34 JSBs. The AR 2078 thumbhole is also being considered  so just asking which you think would be the best candidate for my plans. I know the 2078 would need the tank block added so that's also another factor as far as additional work to covert to HPA as compared to the 2079 or QB79.

Your thoughts.

Mike

[mackeral5]

Make sure the 2079 is actually available before you get your hopes up.  I don't believe any loose guns are available, only packages with scopes, tanks, etc.  Add to cart and you will see if there are any in stock.  you will find that a lot of QB stuff listed on the Archer site are actually out of stock.

[Buldawg76]

Mike
I will check it out and see as you may be right , thanks

Mike

[rsterne]

I haven't built a '79 in .177, but if you max out the available plenum volume you should be OK.... You may need to run up to 1400 psi, but there is no reason you shouldn't be able to get 20 FPE.... but as I say I haven't built one....

Bob

[Buldawg76]

Bob
Thanks as I was kind of thinking the same thing but just want your opinion and spiral groove has one for sale now that he says is making 19 fpe with CP 10.5s with your stage 1 and 2 mods so I believe it is possible.

ASlso found a good deal on a QB 78 NIB that I am going to get so its a non issue now anyway as I know the 78 will be more than capable of achieving it.

Thanks Mike