Getting more hop out of SRC Gen 3 (pro)

punkUser · November 2nd, 2011, 17:12

Hey guys,

I recently picked up an SRC HK416 Gen 3 Pro (thanks Ken) and overall it's a really excellent gun. After swapping the spring, I've gamed it a few times and have had no real issues with its operation.

That said, my wife recently picked up a CA G36C (also a nice gun) and when comparing the two, one thing is fairly obvious: I'm not getting a lot of hop out of the 416.

I always suspected something here as adjusting the hop-up even to the entirely on position made only a minor difference to the BB trajectories and I can never get the adjustment far enough that the BBs shoot up (or even as flat as I think they ought to).

I should note that the gun shoots consistently, just looking for a flatter trajectory with a bit more range (which the CA G36C seems to achieve better). Note also that I've tried a few different brands and weights of BBs and while the heavier ones obviously shoot somewhat flatter, there's no really noticeable difference in the hop between them. I think most of them have been 5.95 +/- 0.01's though, so perhaps 5.98's would get more hop in this gun?

Does anyone have experience with SRC Gen 3 hop-up units? Is this a normal problem? Anything I can do to make it operate better? Is there any way that I could have reinstalled it incorrectly (after doing the spring change) that would cause it to not hop, but otherwise operate normally (seems like a long shot)?

Please feel free to move this to the "upgrades and modifications" section if that's more appropriate. I couldn't really decide where this belonged...

Thanks in advance,
Andrew

punkUser · November 22nd, 2011, 01:32

Just to loop back on this, I took the hopup apart today and it appears to be missing the nub! That would explain this entirely :S No idea how that could have happened... I didn't touch the hopup unit at all when I took apart the gun to change the spring.

Anyways easy enough to fix - ordered a new one and I'm assuming once installed my hopup wil be vastly improved

krap101 · November 22nd, 2011, 01:50

If you changed the barrel at some point, it could have fallen out then, but that doesn't sound like it's the case. Either way, nice catch

XZIVR · November 22nd, 2011, 02:21

I had the same thing happen in a P90 I bought used.. took me almost 6 months to notice though, since it is an indoor only gun and the amount of hopup was still perfect for CQB range. :P

Now, that said, I have an SRC AK and when I took it apart, I noticed it apparently doesn't use a nub at all. It has a metal concave nub built into the thing. I feel kind of dumb asking this, like a mechanic asking if your car wont start because it's out of gas, but.. Are you sure it doesnt have the nub built in like mine?

punkUser · November 22nd, 2011, 03:26

Yeah I never touched the barrel or hopup, so not sure how it could have fallen out...

XZIVR that's not a dumb question at all... in fact that's the first thing I concluded as well. However after some fiddling it clearly doesn't adjust far enough for it not to have a separate nub unless I'm missing something. Even with the one gear at it's maximum location, the arm doesn't come into the barrel at all. If you push it down on the top you can make it protrude, but the gear can never get it that far.

That said, is there a way to know if it's a typical separate nub setup or supposed to be built-in? Would it be shaped differently? I don't have a ton of experience with these things but there's certainly just plastic there on the arm, no metal. Perhaps tomorrow I'll take a picture so you guys can see to make sure, but let me know what to look for in the mean time.

krap101 · November 22nd, 2011, 03:48

Normally, if you have a built-in nub, the symmetric to a line parallel to the barrel axis. Otherwise it will be "perpendicular", so your nub can get in.

punkUser · November 22nd, 2011, 12:48

Ok good point, I'll check that tonight.

punkUser · November 22nd, 2011, 22:17

Alright it looks like it might actually indeed have a built-in nub... what do you guys think?

So given that, any ideas on how to get it to extend into the chamber? Just fiddle with the gears and orientations until I can get something to happen? I assume even at fully extended it should only just show up when looking down the barrel, given the millimeter tolerances we're talking about here, correct?

Thanks for the help so far guys.

HKGhost · November 22nd, 2011, 22:55

Leave the hop up arm with it's nub and get a new bucking. Systema, Guarder, ARS and Firefly just to name a few.

punkUser · November 23rd, 2011, 00:14

Yeah that's what I was thinking as well. I ordered a variety of new buckings yesterday (incidentally from airsoftparts.ca

) and they should come on Thursday so I'll try one of those and see if it performs better than whatever the stock SRC one is.

XZIVR · November 23rd, 2011, 01:03

Yeah that definitely looks like my built in nub. Now I'm glad I mentioned it lol

punkUser · November 26th, 2011, 16:25

So even though the new buckings haven't arrived yet, after taking it all apart and reassembling it I noticed that the range of motion of the gear was much larger than it was before, and indeed I was able to get some visible movement out of the bucking. I reinstalled it in the gun and took it out to test and it's working great now! I'll probably still put a new bucking in when they arrive, but it seems the problem has been largely solved. I guess something about the gears wasn't quite aligned/right and it was catching and preventing the hopup from engaging fully.

In any case thanks for the help guys - everything with the gun is working great now

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November 2nd, 2011, 17:12	#1
punkUser Trader rating Join Date: Sep 2011	Getting more hop out of SRC Gen 3 (pro) Hey guys, I recently picked up an SRC HK416 Gen 3 Pro (thanks Ken) and overall it's a really excellent gun. After swapping the spring, I've gamed it a few times and have had no real issues with its operation. That said, my wife recently picked up a CA G36C (also a nice gun) and when comparing the two, one thing is fairly obvious: I'm not getting a lot of hop out of the 416. I always suspected something here as adjusting the hop-up even to the entirely on position made only a minor difference to the BB trajectories and I can never get the adjustment far enough that the BBs shoot up (or even as flat as I think they ought to). I should note that the gun shoots consistently, just looking for a flatter trajectory with a bit more range (which the CA G36C seems to achieve better). Note also that I've tried a few different brands and weights of BBs and while the heavier ones obviously shoot somewhat flatter, there's no really noticeable difference in the hop between them. I think most of them have been 5.95 +/- 0.01's though, so perhaps 5.98's would get more hop in this gun? Does anyone have experience with SRC Gen 3 hop-up units? Is this a normal problem? Anything I can do to make it operate better? Is there any way that I could have reinstalled it incorrectly (after doing the spring change) that would cause it to not hop, but otherwise operate normally (seems like a long shot)? Please feel free to move this to the "upgrades and modifications" section if that's more appropriate. I couldn't really decide where this belonged... Thanks in advance, Andrew Last edited by punkUser; November 2nd, 2011 at 17:33..

November 22nd, 2011, 01:50	#3
krap101 Trader rating Join Date: Jun 2007 Location: Roscoe, IL USA	If you changed the barrel at some point, it could have fallen out then, but that doesn't sound like it's the case. Either way, nice catch __________________ AIRSOFT PRECISION DYNAMICS - Augmenting Reality

November 22nd, 2011, 03:48	#6
krap101 Trader rating Join Date: Jun 2007 Location: Roscoe, IL USA	Normally, if you have a built-in nub, the symmetric to a line parallel to the barrel axis. Otherwise it will be "perpendicular", so your nub can get in. __________________ AIRSOFT PRECISION DYNAMICS - Augmenting Reality

November 22nd, 2011, 01:32	#2
punkUser Trader rating Join Date: Sep 2011	Just to loop back on this, I took the hopup apart today and it appears to be missing the nub! That would explain this entirely :S No idea how that could have happened... I didn't touch the hopup unit at all when I took apart the gun to change the spring. Anyways easy enough to fix - ordered a new one and I'm assuming once installed my hopup wil be vastly improved

November 22nd, 2011, 02:21	#4
XZIVR Trader rating Join Date: Mar 2011 Location: Calgary, AB	I had the same thing happen in a P90 I bought used.. took me almost 6 months to notice though, since it is an indoor only gun and the amount of hopup was still perfect for CQB range. :P Now, that said, I have an SRC AK and when I took it apart, I noticed it apparently doesn't use a nub at all. It has a metal concave nub built into the thing. I feel kind of dumb asking this, like a mechanic asking if your car wont start because it's out of gas, but.. Are you sure it doesnt have the nub built in like mine?

November 22nd, 2011, 03:26	#5
punkUser Trader rating Join Date: Sep 2011	Yeah I never touched the barrel or hopup, so not sure how it could have fallen out... XZIVR that's not a dumb question at all... in fact that's the first thing I concluded as well. However after some fiddling it clearly doesn't adjust far enough for it not to have a separate nub unless I'm missing something. Even with the one gear at it's maximum location, the arm doesn't come into the barrel at all. If you push it down on the top you can make it protrude, but the gear can never get it that far. That said, is there a way to know if it's a typical separate nub setup or supposed to be built-in? Would it be shaped differently? I don't have a ton of experience with these things but there's certainly just plastic there on the arm, no metal. Perhaps tomorrow I'll take a picture so you guys can see to make sure, but let me know what to look for in the mean time.

November 22nd, 2011, 12:48	#7
punkUser Trader rating Join Date: Sep 2011	Ok good point, I'll check that tonight.

November 22nd, 2011, 22:17	#8
punkUser Trader rating Join Date: Sep 2011	Alright it looks like it might actually indeed have a built-in nub... what do you guys think? So given that, any ideas on how to get it to extend into the chamber? Just fiddle with the gears and orientations until I can get something to happen? I assume even at fully extended it should only just show up when looking down the barrel, given the millimeter tolerances we're talking about here, correct? Thanks for the help so far guys.

November 22nd, 2011, 22:55	#9
HKGhost Trader rating Join Date: Nov 2009 Location: Mississauga, ON	Leave the hop up arm with it's nub and get a new bucking. Systema, Guarder, ARS and Firefly just to name a few. __________________ Please email me as I'm not on ASC too often. Custom Build \| Upgrades \| Repairs \| Maintenance Contact: ghostgunwork@gmail.com / Private Message

November 23rd, 2011, 00:14	#10
punkUser Trader rating Join Date: Sep 2011	Yeah that's what I was thinking as well. I ordered a variety of new buckings yesterday (incidentally from airsoftparts.ca ) and they should come on Thursday so I'll try one of those and see if it performs better than whatever the stock SRC one is. Last edited by punkUser; November 23rd, 2011 at 00:21..

November 23rd, 2011, 01:03	#11
XZIVR Trader rating Join Date: Mar 2011 Location: Calgary, AB	Yeah that definitely looks like my built in nub. Now I'm glad I mentioned it lol

November 26th, 2011, 16:25	#12
punkUser Trader rating Join Date: Sep 2011	So even though the new buckings haven't arrived yet, after taking it all apart and reassembling it I noticed that the range of motion of the gear was much larger than it was before, and indeed I was able to get some visible movement out of the bucking. I reinstalled it in the gun and took it out to test and it's working great now! I'll probably still put a new bucking in when they arrive, but it seems the problem has been largely solved. I guess something about the gears wasn't quite aligned/right and it was catching and preventing the hopup from engaging fully. In any case thanks for the help guys - everything with the gun is working great now

Getting more hop out of SRC Gen 3 (pro)

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