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I recently aquired a G&G UMG in exchange for my CA G36C. Here are my thoughts about it:
The Box
The packaging is pretty well done. The box is amazingly small! Its approximately 19.25" (L), 9.75" (W), and 4.5" (H).
The box itself is nice with a non glossy white background. The graphics printed on it is glossy in appearance.
These words are printed on the box:
-CAUTION!!! Always read the instruction manul thoroughly before operation
-The following item are not included
HaHa! I thought that was pretty funny...
On the bright side, the instruction manual spells "manual" correctly.
Inside the box is a styrofoam insert with cut outs for the Manual, Silencer, and Standard Magazine. In addition to that, the foam insert has a slot that you can put your hand into to grab. This helps in taking taking the gun out of the box. Pretty nifty! The only thing is that the foam insert is not all that sturdy (so the ends of the cut outs could easily break off).
Another thing that was on the box is a sticker that indicates the serial number of the UMG.
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The Gearbox
I'm going over what could be replaced.
1. Gears - These are pretty well made. The material used seems to be better than those of the stock TM gears. The only difference is that it as five notches for the anti-reversal latch instead of the newer CA bevel gear and TM bevel gear (which both have four notches). I did end up yanking this one out in favor of Systema High Speed Gears because they sounded too "whiny" for my taste.
2. Anti-Reversal Latch - The material is pretty much the same as that of the bevel gear. This part interacts with the notches on the bevel gear and keeps the gears from rotating back (which is one of the causes for double feeding).
3. Bushings - The material used is some sort of plastic. It's not the same material as those that come stock with the TM AEG's. IMO, these are pretty crappy.
4. Piston - The material used is similar to the Systema/ Area 1000 black polycarb pistons. I actually like these.
5. Piston Head - It's the same material as the piston. It has 6 holes which is supposed to help with better compression. Systema Duracon Piston head also have 6 holes. Stock CA piston heads only have 4 holes. Stock TM piston heads do not have any portings. The piston head also has a rotating plastic spacer (which functions the same way bearings in piston heads do - for smoother compression).
6. Cylinder - The cylinder type is similar to the cylinder that stock TM MP5K's come with. The hole is a few millimeters off center of the cylinder's length. Compared to TM and CA stock cylinders, these seem to have smaller diameter.
7. Cylinder Head - This piece has a foam padding and tapered (like the Systema Silent Cylinder Heads...just that the tapering is not as pronounced)
8. Spring Guide - Like the piston head, the spring guide has a rotating plastic spacer that acts the same way bearings in bearing spring guides do. It's there for smoother compression. The base of the spring guide is metal, while the top part is made out of plastic.
9. Tappet Plate - On the version one of the UMG, tappet plates look like regular version 3 AEG tappet plates. On the newer ver. 2 release of the UMG, it's different. It was re-designed to stop the double feed problem suffered by the ver. 1 UMG's.
10. Air Seal Nozzle - This piece has an o-ring insert which helps in creating a better seal. Better seal, better FPS.
11. Selector Plate - IMO, they are longer than needed. The back part actually touches the wiring. If the wires gets pushed back, the selector plate could actually damage the wires with the back and forth movement - pounding into the wires. The selector plate type is similar to the ones the TM/CA G36C's use. Those selector plates are interchangable.
12. Spring - These are better than the stock CA springs. These are actually tapered. They will allow for higher than 300 FPS output (provided that the cylider assembly has good compression)
13. G&G Hi-Torque Motor - It's rated for 25,000rpm with an 8.4v 1800mah battery. TM EG1000's are said to have 24,000rpm with what battery? I'm not sure. However, TM Hyper Command Batteries are only rated 8.4v 1300mah. I would not be surprised if the TM EG1000 motor is actually faster than the G&G motor. The pinion gear on the G&G motor looks like it's harder than the TM motor. However, the teeth on the G&G pinion gear's motor is not as good as the TM motor. This may result in a "whinier" output when firing the AEG on semi and full auto mode.
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So, the question now is how well do these parts work together.
Answer: Not as good as TM or CA gearboxes.
-The gears are well made but the motor pinion gear doesnt mesh with the gears as smooth as if a Marui motor was used instead.
-The cylinder being smaller in diameter should allow for better compression but actually doesnt. The hole placement, while good for higher rate of fire is not enough for the gun to push a bb through the 205mm inner barrel efficiently. This results in loss of velocity.
-The piston head is mostly at fault with this seal. The O-ring used is smaller in diameter and the portings that were supposed to help expand the o-ring (creating a better seal) doesn't quite work
These are reasons why you'll see reviews for the G&G UMG would say that stock muzzle velocity is from 260-280 FPS.
When I replaced the piston head with a Sytema Bearing Piston Head(and then relubed it using the TM silicone grease) the UMG shot up to 305 FPS with the hop set for .20g BBs...(Excel .20g BBs).
In AEX's review, they only managed to get 320 FPS with Guarder SP120 spring. With an M120 spring and the new piston head, I was getting 360 FPS.
This just goes to show the inefficiency of the parts that come with the G&G UMG.
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If you really like the UMG/UMP though you will have to get the following parts replaced:
1. Piston Head (switch to TM Piston)
2. Nylon Bushings (switch to TM Nylon Bushings or Systema/Guarder Bushings)
3. Cylinder (switch to an MP5A/SD or M4 cylinder)
4. Cylinder Head (same brand as the cylinder)
5. Anti-Reversal Latch Spring (use a stock TM anti-reversal latch spring, its stiffer)
6. Selector Plate (switch to TM, CA, or cut the back 2mm of the plate)
7. Gear Set (although they appear to be high quality, they have that distinctive AEG whine that I hate wholeheartedly)
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I have replaced thse parts mentioned above and have the following parts in my UMG
1. TM Piston/Piston Head (no portings)
2. Systema Metal Bushings
3. TM MP5 Cylinder
4. TM AK Cylinder Head
5. TM Anti-Reversal Latch Spring
6. Cut down the Stock Selector Plate's back
*7. Guarder Ver. 3 Bearing Spring Guide
*8. Systema M100 spring
*9. TM Hop Bucking
*10. TM MP5 Inner Barrel (229mm)...........barrel length is at 205mm
*11. TM EG700 Motor
12. Systema High Speed Gear Set
With the hop set for Marui .25g BBs I get the following FPS readings:
Excel .20g BBs ~351-355 FPS
Marui .25g BBs ~318-322 FPS
I have no doubt that I'll be able to get the 390-400 FPS that Systema M120 springs are rated for in my the UMG with an MP5 inner barre because the compression is as good as can be.l
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The G&G UMG 70rd Standard Magazine
98% of the magazine is plastic. The only things that are not plastic include the pins and springs used on it. Oddly enough, the "70" round standard magazine says "Hi-Cap Mag" on it.
While the manual states that the magazine the UMG comes with has a 70 round capacity, it actually doesn't. The magazine that I have fits exactly 54 rounds using the smaller diameter 5.88mm Excel .20g BBs. It's possible that the magazine could hold one less bb using Airsoft Elite .20g BBs (5.93mm) - not that it matters that much. Still, the magazine holds almost 20 BB's it's stated capacity.
I have read online that people's standard mags have the same capacity as mine. What's the dealio here?! Perhaps the spring they used behind the BB follower is WAY TOO LONG?
20 BB's worth of compressed spring long?
Maybe, maybe not. I have heard of people cutting these springs shorter. It's not because they want to fit more BB's, but because they believe that the increased tension behind the BB's result in the UMG double feeding.
Those looking for "standard" magazines should be aware that they are not going to get 70 round mags. Instead, they should expect a 50 some bb capacity standard magazine.
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The G&G UMG 530rd Hi-Cap Magazine
G&G's 530rd Magazine for the UMG reminds me of the TM MP5 hi-cap mag. The feed tube/bb door assembly is identical to those of the 200rd MPg Magazine.
No, I did not count to see how many BB's the high capacity magazine actually holds. Well, at least not yet.
These magazines (or at least the only one I have at the moment) works flawlessly. It feeds great. Winding the magazine until the mechanism's clicking sound changes would allow for you to empty a little less than half the magazine capacity ( between 200-250 rounds)
So far, I haven't had a double feed, and skipping issue with my hi-cap mag.
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The G&G UMG Suppresor (from AEX)
The suppressor has a uniform matte black finish. The release button is grayish in appearance.
The suppressor is a one touch silencer. It does need to be lined up properly to the UMG's muzzle or you will damage the muzzle.
AEX's G&G UMG Suppressors act more like a barrel jacket. A metal tube can be found inside the silencer to guide the extended inner barrel kit. (available as a G&G optional part).
The suppressor however can be taken apart, and the sound dampening material added.
There is a slight wobble even when installed properly. The wobble doesn't interfere with the shooting of the UMG. BBs will exit the suppressor as it should.
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Batteries for the G&G UMG
There are a lot of batteries that fit in the G&G UMG. These include:
1. 8.4v 600mah NiCad AK Type Battery - Old School. These batteries ahave been out dated. The only reason why they are still around is that they are arguable the most affordable batteries around. Generally, these things last around 500 shots (or one hi-cap magazine's worth of BBs)
2. 8.4v 1050mah KAN NiMH AK Type Battery - Higher capacity than the NiCad AK Type Battery. It doesn't suffer from memory.
3. 8.4v 1200mah Intellect NiMh AK Type Battery - Similar to the previous battery; Only with a higher capacity. Will last more than two hi-cap magazine's worth of BBs. The best deal when it comes to AK type batteries. It's cheaper than buying two 600mah NiCad batteries and lasts more than twice as long. Doesn't suffer from memory.
4. 9.6v 1100mah Ni-Cad Stick Type Battery - Two rows of 4 cells lined up lengthwise. The ones made specifically for the G&G UMG have an extra long wire so you can connect the connector from the gun into the battery connector neatly. The wire/connector comming from the gearbox is somewhat short.
5. 9.6v 1400mah Kan NiMh Stick Type Battery - Same as above. Higher capacity, no memory. Unfortunately, the wires either not long enough, or too long. When connecting it to the gun, the wires have to be placed a certain way. Lengthening the wires from the gun (by about 3 inches) would help with this.
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