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Old 04-11-2019, 07:57 PM   #1
Young Gun
 
Join Date: Jul 2016
Posts: 38
Choosing the right bucking

Hi guys,

I own an upgraded VFC Hk416, but since a couple of weeks I noticed that the first few rounds of each magazine don't fly straight.

I'm not sure what's causing this issue, but I assume that the bucking is not properly hitting the first few BBs. I'm currently using a ML bucking, but I'm not sure which one.

Now I want to buy another bucking, but I'm not sure which one I should buy. I'm looking for the best accuracy and range possible. I'm not sure if I should go for a TNT or a ML bucking.

The inner barrel is a Prommy 6.03 EG, the FPS is around 350.

Can someone advise me?

Thanks!
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Old 04-12-2019, 01:40 AM   #2
Jr. Sniper
 
Join Date: Apr 2017
Posts: 118
spring pressure of the fresh mag could also push the nozzle out of alignment?
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Old 04-12-2019, 11:44 AM   #3
Young Gun
 
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But it also happens after not shooting for a couple of minutes.. also with almost empty mags. So I think it's not the nozzle, right?
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Old 04-13-2019, 06:41 AM   #4
Jr. Sniper
 
Join Date: Apr 2017
Posts: 118
well it still could be a nozzle issue.


however, did you make feed tests? take the barrel/hopup group out of the gun and feed a bb by hand in the feed tube, look if it falls freely and can be pushed by mild force past the bucking lips...
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Old 04-14-2019, 11:56 PM   #5
Nilye   Nilye is offline
Young Gun
 
Join Date: Jun 2018
Posts: 32
Could it be a temperature issue? If you shoot near 5-7 C the bucking could not work correctly for 15+ shots till the drag makes it a bit hotter.
Michal
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Old 04-15-2019, 11:10 AM   #6
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Location: Canada
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Check for slop between the nozzle and the tube coming out of the cylinder head. With the nozzle extended to where it's supposed to be when firing, check for play between the nozzle and the tube on the head...if you get more than the slightest bit, your nozzle is out of alignment and succumbing to pressure from the mag.
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Old Today, 05:35 AM   #7
Young Gun
 
Join Date: Jul 2016
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So I tested a couple of things.. the BBs don't fall out freely, but I only have to apply mild force (barely any) to get them past the lips.

It can't be the temperature since it's 20+ C here. The nozzle has no play at all, so I guess it's the bucking, right?
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