I actualy have a Madbul 3 in 1 with a madbul rubber and 455mm V2 Balck madbul barrel.
Ok the hopup.. not a fan, couldn't seem to get it to feed the bbs (I was new) with the knowledge I have now. Maybe just maybe, area the little spring fit in (the one that pushes the hopup against the front of the mechbox) the upper was to deep and the hopup was out of position.
The hopup Rubbers... not a fan.. no matter what barrel i used i couldnt seem to get a
consistant FPS (20 point jumps)
when I put in a guarder i would have a 4 or 5 fps varience in the same system.
The 455mm Barrel - It was in my 481 FPS VSR and out to about 75 feet it was ok, afte that
the bbs spread like a shot gun (30Wt Devils)
I did try it in a M4 with the king arms Hopup assembly with guarder black rubber and
a FPS around 360, it was tight out to about 120 feet with 28 bastards and 30 wt devils.
So my consensus.
the barrel Not to shabby, find the right BB and hopup rubber you'll be in like Flynn.
The hopup rubbers.. YA NO. hell tempt fate BABY try the modify ones, I am.
So far on aegs under 420 with Rofs ranging from 8 BBs Per sec (411 Avg FPS) to
20 BBs persec at 373 FPS and they hold up nice so far
the hopup assembly Needs to be retested but at 25 for a modify with 2 control arms
i dont think i'll testing soon
Ps i likethe king arms aswell but when dollars are dollars ..
well to quote the Great Geddy Lee "10 bucks is 10 bucks"