||This replica is awesome. It is by far, the best AEG I have ever handled, and I have handled many. Ranging from CA MP5's and M4/M16's up to ECHO1 MP5's and G36's. This is by far the best built AEG I have had experience with.
1) Excellent internal/external quality. The real steel version of this SMG (UMP) is fiber glass, so I'm glad G&G stuck with ABS plastic for the body. The internals are of much higher quality than Tokyo Marui and Classic Army. The metal stock internals that came with the gun have lasted me around 40,000 rounds with no replacements other than the hopup unit. The gears are steel, not pot metal, and very strong. The piston is not plastic, it's polycarbonate much like a Guarder piston used for upgrades. The piston head is a strong plastic that has lasted as well.
2) Outstanding performance. This gun had about a 700RPM w/ an 8.4V battery. I would consider that average for a stock AEG, however when I put a custom 9.6V 2000mAh battery in it. It shot it up to around 900RPM. That's w/ stock internals! The G&G UMG chrono'd at 330-340 FPS w/ Airsoft Elite .2g BB's. The accuracy was very impressive. The UMG comes STOCK with a 6.04mm inner barrel. That's considered a tightbore. It can hit a pop can from 50 ft consistently, and a sheet of paper consistently from 150 ft.
3) Durability is excellent as well. I have put around 75,000 rounds through my UMG, and have had only one minor external problem. The catch on the bolt snapped off after a while, but it can be replaced from ordering a new bolt for around $25.
4) It's UNIQUE! I don't know about you, but I get sick of seeing M4/M16 variants and MP5's. Sure, they're great guns, they look good, and they perform well. So does the UMG, and not every Joe-Schmo has one...It's a unique choice, and a rather sexy one.
1) Certain aftermarket stock parts for this replica can be difficult to find at times, it's not your normal M4/M16 variant where parts can be found anywhere, but they can be found, if you know where to look.
2) Battery life is somewhat limited because of the small compartment used to store the battery, you are limited to a stick or custom type of battery. The Intellect 9.6V 2000mAh (in a double stack formation) is the highest voltage and mAh capacity I have seen for a battery that will fit in the UMG.
Overall, if you're looking for a unique CQB airsoft replica, I would highly recommend this gun. It doesn't need a lot of repair work, so it works for a newbie to airsoft, and it accepts most Version 3 Gearbox upgrade parts for the more expirienced player.
For your enjoyment I will list what I have done to my UMG over the time I have had it:
*Systema High Speed Gear set for Ver 3
*Systema Polycarbonate Piston for Ver 3
*Guarder SP 130 enhanced AEG spring
*Custom Intellect 9.6V 2000mAh battery
*Systema silicone hopup w/ bucking
*Custom work on the hopup and C-clamp
*Dees Customs Barrel- 6.01mm tightbore, 208mm length
*M16 ergonomic pistol grip for the bottom rail
*Opticess/PHX Panorama Multi-Reticule Reflex Sight
*Custom work on the battery compartment to house battery
*Chronos at 380FPS w/ a .2
*~950RPM w/ 9.6V
*3-inch groupings at 180ft (no wind) w/ Dees Customs barrel
Rating: [5 of 5 Stars!]