Lower FPS JG Bar build questions

Jmann · Jul 29, 2015

Hello Everyone, as you can see in my signature I have already ordered and received a few things for my new JG Bar 10 G Spec. My field has a 550 FPS limit but a 450 FPS with no MED, I have read a lot on this forum and rather like the idea of under 450 FPS with no MED.

The confusion for me is that apparently the new JG bar 10s both G Spec and regular have a lower FPS spring then the older ones, but all of the chrono videos show the older model. With the TM chamber, 6.03mm 430 mm barrel, and TM bucking anyone have a rough idea on my FPS? More importantly what else do I need for a dependable 440ish FPS BAR 10?

Thanks so much, awesome forum I have learned a lot without even posting up until now!

Chassy13 · Jul 29, 2015

There really isn't a way for us to tell you what your FPS is, especially out of a stock rifle. The tightbore might boost it up a little.

I wouldn't assume you're over the field limit with what you have. Maybe you could buy a spring and quickly change it if you're over the limit.

The following link should tell you everything you need to know about adjusting your FPS: http://www.airsoftsniperforum.com/32-general-sniper-talk/4260-need-speed-fps-checklist.html

As to your last question, the first thing you should be buying is a better trigger system, more specifically better sears to avoid the famous slam-fire. I suggest the AA Zero Trigger, but there are others as well, which should last you a very long time. Some stock sears break within 50 shots! Lots of information here: http://www.airsoftsniperforum.com/41-vsr-rifles/10635-ultimate-guide-your-vsr-10-a.html. And if you're sick of the bb curving issues with these models, look into either the TDC mod or an AA hopup chamber.

Edit: Looks like you've got some upgrades covered in your sig. Just shuffle through those threads I placed then and you'll find further modifications/upgrades you can do.

Making a truly great rifle will take blood, sweat, and tears (oh, and a little weight loss on the wallet...

). But when you finally fire and that BB smacks where your crosshairs told it to, it is all worth it.

Jmann · Jul 29, 2015

Thanks Chassy for the reply

Will the SHS Sears in the stock gearbox be good enough for a 450 FPS setup long term? How about the stock Piston? The guide states a recommendation of the Laylex or AA trigger system, but not just the sears, any advantage on a low FPS system?

It seems with FPS we do not know the stock FPS of the regular or g spec, does each rifle vary in FPS so much it is to tough to call? Poor manufacturing tolerances of JG?

Chassy13 · Jul 29, 2015

I do not have experience with SHS sears, but from what I have heard they can be hit or miss on how long they last. I'll wait for someone else to put their knowledge into that. Either way, I'd run your sears until they do break and then install the new ones.

The AA trigger gives you a really light trigger pull. On top of that, you don't really have to worry about ever slam-firing, the trigger system removes almost all possibilities of that problem becuase they are built tough. If you buy the set, it will also come with a great piston. This can probably wait if you're on a budget and just purchased new sears.

For the piston, check for air leaks. You can slightly lube the edges of the piston and inside the cylinder with grease, but do not overdo it and keep any grease away from the cylinder head. Do not use oil (or you could end up splashing some into your bucking), use grease, that does not contain petroleum.

FPS can vary based on many factors. If I remember correctly, the JG Bar-10 was typically shooting around 400 FPS or so out of the box, but don't quote me on that. BB weight, BB brand, springs, air seal, and numerous other factors can affect FPS. If you are aiming to be 450 for sure, then I would look into some lower power springs, and see if you can chrono them early at the field if you're close by.

Jmann · Jul 29, 2015

Thanks Chassy this is exactly the information I was looking for, sounds like the AA trigger has a lot more advantages then I had first thought, if it has a new piston it may even up the FPS a bit. I think I will do what you have said and keep the stock Sears, but keep the SHS ones with the gun in case they break in the field for me. I think I will shim the hop up, but wait on the TDC mod, then go buy the AA chamber and AA trigger if I enjoy sniping.

Chassy13 · Jul 29, 2015

Jmann said:
Thanks Chassy this is exactly the information I was looking for, sounds like the AA trigger has a lot more advantages then I had first thought, if it has a new piston it may even up the FPS a bit. I think I will do what you have said and keep the stock Sears, but keep the SHS ones with the gun in case they break in the field for me. I think I will shim the hop up, but wait on the TDC mod, then go buy the AA chamber and AA trigger if I enjoy sniping.

It is a great idea to make sure you like the role of a sniper before spending a lot of money on upgrades. A lot of people spend a lot of money on upgrades, then realize you don't always get 1,000 kills per match, and drop the idea of sniping. Good plan. :tup:

Jmann · Jul 29, 2015

Thanks Chassy, yeah I just don't see a good reason to do the dangerwerx hop up arm, anti blow by rings, and TDC when I could pick up a nice AA chamber. Can't wait to see where I'm at chrono wise.

DillSS · Jul 30, 2015

The stock bar-10 shoots at 400 fps but quickly drops to 380 within 2 months. To increase that fps, the best solution is to input a stronger spring. A m140 can get you to around 450 fps, but not all the time. Additionally, that 6.03 barrel will just increase fps by 5. I recommend getting a stronger spring, m170, and cut it down to your desired fps. Look up 1tonne's spring cutting tutorial.

Now the shs piston sear is 1mm longer than the stock one and has given me some headache. However, the build quality is very good. Eventually, the rifle would not fire because the sear was still holding onto the piston after a trigger pull and required a good bashing to shoot on its own. I did shave off that 1mm but still encountered slam fire. But I may have just gotten a lemon. If you have the funds, invest into a 90 degree trigger because it is reliable, durable, and has a very smooth bolt cycle.

Jmann · Jul 30, 2015

Ok so it appears I should keep the SHS gears in my field bag with some tools and hope I don't need them before the stock setup breaks. It really sounds like from reading it's not poor quality parts it's the terrible 45 degree system. I was not planning on going crazy so soon but the guides were not lying you can't really build a decent sniper for less than 500.00.

So is AA the zero trigger the general recommendation? can I throw an m140 on stock Sears for two 8 hour games before putting another 150.00 in this gun?

Thanks again awesome info

Chassy13 · Jul 30, 2015

Yep - the sniper rifle is very expensive indeed but it's truly a cool experience when you see results. And you learn A LOT while building them, which is why I recommend building/modifying everything yourself. Patience is key, do your research and take it slow (like a sniper should do anyway!). Lots of options out there and it's easy to get confused. That's why this forum exists.

I recommend the AA trigger simply because it's a copy of the Laylax one but $60 cheaper without losing quality. In fact, most of AA's parts are copies of the Laylax ones and much cheaper. The only part I don't recommend from AA is their tightbore barrels, there are better quality barrels but they are great if you're on a budget. There are probably better buckings out there, but AA's buckings are cheap and have worked fine for me thus far. There are other trigger systems out there though, don't hold back from looking around.

Can you throw an M140 spring in for a couple games? Yes. Will it last for sure? No. Like I said earlier, the stock trigger sears are very unpredictable. I've seen cases of them breaking within 50 shots, 300 shots, 2000 shots...sometimes even longer. Increasing the spring power decreases the lifetime. The AA trigger can take M170 springs, and I believe some people even run 190s in them. I personally use an M170 that's cut down a little bit, or an M150 depending on where I play.

If you can, try and figure out how to install the new sears before you head to the field. That way if your gun DOES break, you aren't sitting there spinning on how to install the new sears, and don't lose a lot of play time. Just be careful when disassembling, lots of small screws and springs that can fly all over the place.

Jmann · Jul 30, 2015

Thanks Chassy I am definitely going to look into a new trigger system. I think I will throw the SHS Sears in to see if they work since some people are having issues with them from the get go. It will let me know if I truly have a spare Sears set or not.

bushes · Aug 2, 2015

I think you've got a good start to experiment with sniping right now. The SHS sears and stock piston should hold up to a 450 fps setup just fine for a while unless you've got a lemon part somewhere. I've been running a similar set up with angel custom sears (I know, judge me) for a good while now with no issues. With a good barrel and bucking, some hopup mods, and a good airseal you should have an effective rifle. Look through the general sniper talk section and the stickied build threads for free/cheap mods you can do. Get a better O-ring for the stock piston (#14 I think?), Clay the stock, make some barrel spacers, and look into ariseal mods, TDC, and LRB.

I think you should be close to 440 with the stock spring and a good airseal, but you'll just have to chrono your rifle at the field to find out for sure. If the fps is lower than you want you can shim up the spring to add some more preload, and if it's too high you can cut a coil or two off of the spring.

Jmann · Aug 3, 2015

Thanks Bushes,

Update! I have done all of the mods, the TDC mod is drying, it shot 175 feet very accurately with a slight right curve. Coke can chrono revealed just under 400 fps before wrapping the cylinder head, air brake mod, and TDC. I'm hoping to be 430-440 fps with those DIY mods. I think with my current setup in my signature I should be roughly a 200-220 foot effective range sniper. Next mod will depend on how well the gun chromos at the field, keeps raining here so it might be awhile. While 550fps sounds nice I'm not sure it's worth giving up 90 feet of engagement distance over 100 fps. Can't wait to try it all out at the field!

Jmann · Aug 12, 2015

Ok an update all of the upgrades and DIY modifications in my signature are complete with the exception of the three ordered parts.

AA 45 degree piston
AA spring guide
AA m150

I am hitting out to 200-220 feet maybe more consistently, I am considering either trimming the spring to 450 fps or keeping it at 500 fps with the full length spring. Either way I want my Sears to be be high quality and right now I have SHS Sears installed and the stock ones I can replace if those break. I have seen people say SHS are for stock only but no one that actually has used them until they broke. I am looking for real world experience with Sears only, I know edgi Sears can handle 550 fps all day long with no issues. I have not seen any similar experiences with the pdi, laylax, or action army. I would like positive input on any Sears set, fps level, and length of time. Once again not interested in trigger setups for my project, I have considered this in depth. Thanks again the project is going great I will post pics of the paint job soon

Lower FPS JG Bar build questions

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