The Umarex EBOS – Part 3
by B.B. Pelletier
Today, I’ll finish the test of the Umarex Electronic Burst of Steel — the Umarex EBOS. This is accuracy day, and the test runs exactly as it has for the other two BB submachine guns I’ve tested — the HK MP5 K-PDW and the Umarex Steel Storm. That means 10 aimed shots at 15 feet on semi-auto, followed by several bursts of full-auto fire.
I have three BBs to test today, and the EBOS brings us a complex set of operating parameters. You can select from either one shot, which simulates semiautomatic fire, a 4-shot burst or an 8-shot burst. But there’s also the rate of fire to select. It can be set for 300, 400 or 500 rounds per minute (RPM). I discovered very quickly that 300 RPM is too much like shooting an M3 grease gun, which bounces around in your hand without much possibility for accurate aimed fire. So I did what every EBOS owner will eventually decide to do. Set it to 8-shot bursts and 500 RPM. Once I did that, I made no attempt to test the other rates or the lower burst count. Nor would a cigarette boat owner use a trolling motor for better fuel economy!
In the beginning, I was just trying to adjust the rear sight so the groups would be centered on the bull. The rear sight is fiddly and I found it difficult to adjust. When I shot, I felt the rear notch was too close to my eye for good accuracy, but the gun proved me wrong on that count. I’ve had the same problem with 9mm MP5s, and they always seem to hit their target as well. Apparently, mine are just the ramblings of an old dog who cannot learn new tricks.
Once the rear sight was centered in adjustment, the gun shot to the point of aim. I wish there was an elevation adjustment on the rear sight as well, but I suppose most owners will slap a red dot on the top Picatinny rail and be done with it.
Crosman Copperhead BBs
The first BBs I tried were Crosman Copperhead BBs. As I fired 10 semiauto shots, I was impressed by how smooth the EBOS trigger is. That’s no doubt due to the electrical drive unit in the pistol grip. All the trigger has to do is make contact and the gun fires.
The first group was impressive, especially in light of the tests of the other two guns. You can’t even see 10 holes in the target, but one hole at the bottom of the group is clearly larger than the rest, and apparently swallowed four BBs.
Then, I switched to rock ‘n’ roll. I first tried 300 RPM rate of fire and a 4-round burst, but it soon became obvious that wasn’t the way to go. So, all the switches were set to the max, and that’s the way the rest of the test was conducted.
Daisy zinc-plated BBs
Next, I loaded Daisy zinc-plated BBs and ran a second 10-shot semiauto test. Oh, my gosh! I got accuracy that’s not too far from the Avanti Champion 499 target gun! And this was with the sights I was complaining about! Imagine what this gun could do with dot sights!
At this point, I was wondering what would happen when I switch over to warp drive. Well, you know the answer. I switch and the gun continued to group tight. I kept shooting and reloading, shooting and reloading. At this point, my test design was blown because I hadn’t tested the other two guns the same way, nor am I going to. But I figured a part of this evaluation was the fun factor, and any day you can keep my finger on the trigger of a full-auto gun, you know I must be having fun!
Finally it came time to test the new RWS BBs. You may recall from the Steel Storm test that these BBs were almost as good as the Daisy zincs, and I said that more testing would be needed. Well, look at what happened with the EBOS.
When I switched to overdrive with the RWS BBs, something wonderful happened. The group stayed the same size. It just has about four times as many BBs through it. I could not stop shooting, and I know the full-auto group has at least 40 rounds in it.
Crosman 850 trap
Wow! It’s been a while since an airgun made me smile like this one does! And do you remember that I said I would be using the Crosman model 850 BB trap for this test? Well, I did, and despite the power of the EBOS, the trap did not suffer one bit.
So, now I’ve tested all three BB submachine guns completely. And here’s my assessment. The Steel Storm is the best value, but the EBOS is THE boss!