Hop up arms not long enough?

[Skara]

Heya,

Just bought a prommy blue bucking and a couple of flat nubs for my arp, and I noticed that the hop arm doesn't push down enough to have any sort of effect ? (using the stock G&G rotary chamber)..

is there anything I'm missing?

 

[Prisce]

The Prommy Blue and Black are shite.

Better off flat hopping the Standard G&g green.

Have you the prommy flat nubs? Might be worth trying the Biro mod with them.

 

[ImTriggerHappy]

What flat nubs?

The blue hop rubber is fine, there were a couple of bad batches but been ok in the last year. Just make sure it is new stock.

 

[Skara]

The nubs are prommy bridge type ones, these http://www.tacticalcustom.com/it/gommini-hop-up/2993-prometheus-pressore-flat-hop-up-tensioner-bridge-type-0005322.html

Flat with a small trench in the middle, 2 in the pack, one blue (softer) and one black (harder).

I heard the blue buckings were shit, but I wanted to try them out anyway..

 

[Adolf Hamster]

Are you sure the nub isn't catching on the window in the hop unit/barrel? They can sometimes need a bit of trimming.

 

[Skara]

Are you sure the nub isn't catching on the window in the hop unit/barrel? They can sometimes need a bit of trimming.

Click to shrink...

Already trimmed.

It does the same with the standard tubular nub that comes with G&G greens. Fully dialed in yet it only applies barely enough hop to lift .25s..

I will update this post tomorrow with a couple of sketches so you guy get an idea (cba to take down the hop again)

 

[Adolf Hamster]

Already trimmed.

It does the same with the standard tubular nub that comes with G&G greens. Fully dialed in yet it only applies barely enough hop to lift .25s..

I will update this post tomorrow with a couple of sketches so you guy get an idea (cba to take down the hop again)

Click to shrink...

i think i get what you mean, although i'm surprised you're getting it with a standard type hop unit, normally it's the pro-win/madbull style ones have trouble with not enough lift

 

[ImTriggerHappy]

Already trimmed.

It does the same with the standard tubular nub that comes with G&G greens. Fully dialed in yet it only applies barely enough hop to lift .25s..

Click to shrink...

There is a small hole through the top of the nub put a piece of bar through it so that part of the nub cant compress. Also when doing a flat hop it works best if you angle the window on the barrel. This allows the rubber to push through with less tension. Also check the width not just the length of the nub.

Failing that add a spacer.

 

[Skara]

There is a small hole through the top of the nub put a piece of bar through it so that part of the nub cant compress. Also when doing a flat hop it works best if you angle the window on the barrel. This allows the rubber to push through with less tension. Also check the width not just the length of the nub.

Failing that add a spacer.

Click to shrink...

What do you mean by angling the barrel?

i think i get what you mean, although i'm surprised you're getting it with a standard type hop unit, normally it's the pro-win/madbull style ones have trouble with not enough lift

Click to shrink...

I also found the same problem with a Retro Arms CNC'd hop chamber and a Modify flat bucking + nub.

It's me being either completely retarded or extremely unlucky with my purchases ?

 

[Adolf Hamster]

I also found the same problem with a Retro Arms CNC'd hop chamber and a Modify flat bucking + nub.

It's me being either completely retarded or extremely unlucky with my purchases ?

Click to shrink...

yeah, the pro win seems to have the biggest lift of the aftermarket ones, but not as much as a default style.

you could look at the maple leaf macaron or rhopping, more meat inside to account for the lack of travel.