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Showcase cover image for A+ Studio Hop Up Rubber

General Information

Price
8
Link:
http://www.acmgear.com/advanced_search_result.php?keywords=a%2B&x=0&y=0

The
A+ Studio hop up rubber is advertised as being capable of stretching
the range of your airsoft gun more than noticeably. First video of
this product showed a WE Glock 18C accurately shooting out to 60
metres (197 feet). Let’s see how much of this is true.
Im
not the mechanical type, so Im just gonna give you my impressions on
this rubber. I turned it inside out so you can see the surface that
gives the BB its spin: it’s much wider than the average rubber and
the circumference seems to give a more
The
hop up rubber comes in a little plastic baggie, together with a small
piece of paper stating the hardness level (depending on the power
your gun is shooting at), you may need a 60’ (up to 330 fps), a 70’
(340-390 fps) or an 80’ 83’ (390 fps and above), and the type of
gun for which this specific rubber is made (AEG, Gas Pistol or sniper
rifle, careful: just a few models can take this rubber).
I
wish they came mounted on a piece of plastic tube (like Madbull’s),
as mine came a bit flattened. No hop up nub is included. I guess you
can use the standard one.









Installing
these parts is very easy (once you get the inner barrel and hop up
unit out; this can take less than a minute on most M4 type AEGs, to
10 minutes on more complicated guns). Get yourself a disassembly
guide for your gun, study it, get a clean working surface (white
towel so small parts dont jump around and can be easily seen).
Disassemble
the hop up unit. Take the standard rubber out and substitute with the
XX. Make sure it’s in the correct position. Carefully mount back
into hop up chamber and reassemble the whole gun.
The
theory is that the wider contact surface is going to provide the BB
with a more thorough backspin. Also, the inner curve of the contact
surface should provide better control of the BB, as it is touching it
more widely, which should increase precision, IMO. There are people
on this forum who know whay more about the physics of these. Look for
hop up rubber mods, R-Hop, etc.



Performance:


I
used KSC 0,20 gram BBs.
I
tested this in a stock JM SR-16 with a 13.5’ barrel (CQBR style).
Stock inner barrel (cleaned), stock everything. Stock FPS: 341-352.
Hop up adjusted.
The
average range of the gun was (in a circle of about 2 meters in
diameter) from where I was shooting in kneeling position: 60 meters
(200 feet).
At
around 30 meters (100 feet), I hit this box 12/20 times.
At
12 meters (40 feet) I got this grouping.


On
the same gun, after just changing the hop up rubber and leaving
everything else as it was, I got these results:
FPS:
went up to 358-366. Because of the tighter fit against the BB,
there’s a better seal, I guess.
Range:
Shooting from more or less the same position, I got the BBs to drop
at around 80 meters (260 feet).
At
around 30 meters (100 feet), I hit this box 18/20 times.
At
12 meters (40 feet) I got this grouping.

Gallery

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