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n0tr3adY

ASG CZ BREN 805 A1 feeding issue

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Hello guys!
I'm searching through the internet since a week, and can't find any solution for this.

 

Here it goes:

Shooting on semi the bb's fall out after 3-4 meters, chrono test shows 250-320 fps. Changing fire mode to auto after 2-3 bb's the air leak disappears, and the feeding goes well and the fps goes up to 380 +/- 10 fps (with m110 spring).. Easy to reproduce the malfunction, change mags.

The gearbox shimming and air seal is perfect.

 

I have some experience on ver2 / ver3 gearboxes, but never experienced that kind of malfunction.

 

 

Thanks in advance!

 

Upgrade parts:

- ASG 40k Ultimate motor

- Specna Arms 16:1 gear set

- Slong 100% (full) cylinder

- Slong 14 teeth piston

- ASG POM vented pistonhead

- SHS cylinder head
- Airsoftpro nozzle (same lenght as original, 34.1mm)

- King Arms delayer (stock)
- Maple leaf 70 rubber + omega nub with Maple leaf 6.02 tightbore barrel


 

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try swapping the maple leaf out for something else, i tend to find the feed lips are too long and give similar symptoms.

 

you can sand them down a bit, but it's kind of a pain in the ass.

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Are you using fully loaded midcaps for the first few shots? If so, half fill them then try semi. 

 

Could be midcap syndrome. 

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9 hours ago, Asomodai said:

Are you using fully loaded midcaps for the first few shots? If so, half fill them then try semi. 

 

Could be midcap syndrome. 

 

Already tried with the bren stock high cap magazine (have both magwell), same. 

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Sounds like it could be the nozzle not sealing correctly. Try the SHS nozzle with the cylinder head, I don’t know what compatibility is like with the Airsoft Pro version.

 

(Had the same issue with a M60- hence suggestion) 

 

Do your bbs fly every direction, or just out and drop?

 

 

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48 minutes ago, Prisce said:

Sounds like it could be the nozzle not sealing correctly. Try the SHS nozzle with the cylinder head, I don’t know what compatibility is like with the Airsoft Pro version.

 

(Had the same issue with a M60- hence suggestion) 

 

Do your bbs fly every direction, or just out and drop?

 

 

The nozzle seals perfectly in opened and closed state. The bbs flying for 2-4 meters in same direction then drop. There is only one type of aftermarket nozzle for Bren, because it's very long (34.1mm) - i had to replace the stock one because it leaks.

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5 hours ago, n0tr3adY said:

The nozzle seals perfectly in opened and closed state. The bbs flying for 2-4 meters in same direction then drop. There is only one type of aftermarket nozzle for Bren, because it's very long (34.1mm) - i had to replace the stock one because it leaks.

Then it’s definitely hop related. Either the hop unit is putting too much pressure on the bucking, the bucking isn’t in 100% square, the nub has moved or like @Adolf Hamster said, the bucking may be to hard.

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3 hours ago, Prisce said:

Then it’s definitely hop related. Either the hop unit is putting too much pressure on the bucking, the bucking isn’t in 100% square, the nub has moved or like @Adolf Hamster said, the bucking may be to hard.

 

Maybe..The BREN has unique hopup chamber (yt video), the nub can't move just up/down. 70° Maple leaf with Omega Tensioner (dedicated use with maple leaf rubbers).. I thought it was soft a bit for 0.3 - 0.32 bbs. I have a green G&G 60°, i'll throw a try.

 

Edit : replaced the rubber to G&G 60° with a softer nub, still feeding problems.. I'm starting to think my caps are sh1t.

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