First Look & Overview In this table top review, we are taking a look at the Umarex Glock 17 Gen 5 MOS Full Blowback CO2 4.5mm BB Pistol. We will be focusing purely on the table-top aspects for this video, so there is no active shooting featured here; a dedicated field test shooting video will be coming down the road. As a fully licensed replica from Umarex, it offers all the authentic Gen 5 styling and markings you would expect. Today, we are specifically looking at the full blowback version, which prioritizes a true-to-life shooting experience and heavy recoil simulation over pure power and efficiency.
Specifications
Caliber: 4.5mm steel BBs
Action: Single action, full blowback
Magazine: 17-round drop-out magazine
Power Source: 12-gram CO2
FPS: Maximum 300 FPS
Weight: 1.5 lbs (680 grams)
Length: 7.95 inches (20.2 cm)
Barrel: 4-inch (10 cm) smooth bore
Build Quality & Design The Umarex Glock 17 Gen 5 MOS features an incredibly realistic design, boasting a heavy metal slide paired with a durable polymer frame. It completely matches the heft of its real steel counterpart, weighing in at a solid 1.5 pounds, and feels very comfortable in the hand. The slide comes with the signature Gen 5 front serrations and cycle.s completely back during operation, opening the ejection port fully to reveal the wide open magwell
Magazine & Loading System Loading the Umarex Glock 17 Gen 5 MOS BB Pistol is straightforward. It utilizes a heavy, full-size drop-out magazine that holds 17 rounds of 4.5mm steel BBs. The magazine follower can be pulled down and easily locked in place with a quick flick, making loading incredibly fast. Unlike partial blowback models where the magazine pulls forward to seal the breech, this model utilizes a traditional Airsoft-style follower-fed system where the slide simply strips the BB and loads it directly into the breech. While this design is less CO2 efficient and results in slightly less power, it is essential for delivering that complete, highly realistic full blowback action.
Handling & Controls True to the Glock platform, the handling on this replica is extremely authentic. It incorporates an ambidextrous slide catch release that smoothly locks the heavy slide rearward when the magazine runs empty. The single-action trigger pull is relatively light and short. In terms of safeties, it has the classic built-in trigger safety, but Umarex has also integrated an additional cross-bolt safety directly onto the trigger. While it functions well, it can be slightly awkward to push flush and disengage with your finger when you are preparing to shoot.
Sights & Optics This specific MOS (Modular Optic System) version truly shines when it comes to aiming options. Out of the box, it comes equipped with the standard fixed white-dot front and rear sights for easy target acquisition. However, the package also includes an Allen key and four different adapter plates, allowing you to seamlessly mount a variety of micro red dot sights directly to the slide. If you want to add more accessories, the built-in lower rail easily accommodates tactical lights or lasers.
Performance Expectations The Umarex Glock 17 Gen 5 MOS Full Blowback CO2 4.5mm BB Pistol operates with a heavy focus on realism. Because the heavy metal slide travels all the way back with every shot, you get a very satisfying simulated recoil. However, this heavy action demands a significant amount of CO2. As a result, you can expect a slightly lower velocity, coming in at around 300 FPS, and fewer overall shots per CO2 cartridge compared to partial blowback models.
Pros
Realistic Replica in looks, weight, and full blowback function.
Good weight and feel to it, build quality seems excellent as with all the Umarex Licensed Glocks.
Really nice looking and full featured replica of the original Glock 17 Gen 5 MOS.
Fully Glock licensed via Umarex.
Easy to see white dot sights front and back.
Recessed barrel for added realism.
Accessory rail under barrel for adding a laser or tactical light.
Full slide travel blowback action provides a true, hard-recoil shooting experience.
Can be field stripped just like the real steel version.
Cross Bolt Safety built into the trigger.
Full size drop out metal magazine that holds the CO2 and 4.5mm steel BBs.
Slide spring is super snappy and firm, giving an exceptionally crisp and authentic recoil effect.
Warning instructions are nice and discreet under trigger guard.
Lighter, true single-action trigger pull as the full blowback slide cocks the internal striker on every cycle.
Cons
Full blowback action decreases CO2 efficiency, resulting in fewer shots per cartridge.
Slightly lower velocity (300 FPS) due to the heavy slide action.
No adjustable sights out of the box without mounting a red dot.
Final Thoughts The Umarex Glock 17 Gen 5 MOS is a fantastic option for anyone who values maximum realism and training utility over raw FPS. While you do trade some CO2 efficiency for the heavy slide travel, the simulated recoil and authentic handling make it an incredibly enjoyable Airgun to shoot. The inclusion of the MOS plates is a massive bonus for modern shooters wanting to run optics. Stay tuned for the upcoming shooting video to see exactly how this performs down range.
We’ve got yet another box on the table today for our August Mystery Unboxing. It took a while to arrive, but it was absolutely worth the wait. We’re diving into four highly anticipated products across the BB, Pellet, and Airsoft categories.
Here is a quick first look at what’s hitting the review table soon!
First out of the box is the Marksman 1018. This is a very budget-friendly (around $50), 1911-inspired spring-actuated pistol. It features fiber-optic sights on the front and back, making it an excellent, quiet option for basement or backyard plinking. While it can technically shoot darts and bolts, we'll be sticking to BBs and pellets for our tests.
Next up is a beauty from Umarex, the Glock 17 Gen 5 MOS. If you love ultra-realistic replicas, this is it. It features a heavy full-metal slide spring, a recessed barrel, and classic white dot sights. The "MOS" means it comes ready with all the mounting plates you need to attach your favorite red dot sights. It runs on a full-size, drop-out 17-round metal magazine and utilizes a full blowback system for ultra realistic blowback operation.
Basic Specifications:
Action: Semi-auto full blowback, single CO2 cartridge
I'm incredibly excited to finally do a proper field test on this one. This is a replacement for a previous model that had a leaky loading valve. This gas-operated, "Mares Leg" style lever-action rifle is heavily modernized. It features a gorgeous real wood stock, an enlarged lever loop, a Picatinny top rail, an M-LOK handguard for accessories, and a mock suppressor on the front.
Finally, we have an absolute powerhouse in a tiny package: the Specna Arms SA-E10 PDW. This is a super-compact AR-style AEG with a polymer-metal build and a telescopic stock. Specna Arms goes above and beyond with the box contents on this one. Along with the rifle, you get two S-MAG mid-cap magazines, an additional M90 drop-in spring to easily lower your FPS for indoor fields, a Deans adapter, and a vertical foregrip.
Basic Specifications:
Action: Electric (AEG) with Pre-installed MOSFET
Capacity: Includes two 125-round mid-cap S-MAG magazines
Velocity: 375-390 FPS (Drops to ~310-320 FPS with included M90 spring)
Length: Minimum 505 mm (approx. 19.8 inches)
Inner Barrel: 160 mm precision 6.03mm barrel
Stay tuned to the Replica Airguns channel, as I'll be doing dedicated tabletop and field test shooting videos for all of these very soon.
I finally got my hands on the new Umarex Glock 17 Gen 5 MOS CO2 Blowback BB Pistol that was introduced at this years SHOT Show, and I have already made my Table Top Review Video so make sure to watch that video for information on specifications, details, Pro’s and Con’s and more close up video… In this Field test Shooting video I focus on the performance of the Umarex Glock 17 Gen 5 MOS CO2 Blowback BB Pistol by testing the velocity out with my Chronograph, and I also shoot 10 rounds into a paper target setup 30 feet down range to see what the real world velocity and accuracy truly is.
Starting off with the Velocity portion the test, as always I use a brand new 12 gram CO2 along with standard 5.1 grain Steel BB’s. Temperature for the record was about 22 degrees Celsius or 72 degrees Fahrenheit. Here are the result of my multi shot Chronograph testing as it seemed to keep shooting faster and fast so I ended up using the last 5 shots for my average: 354, 349, 348, 343, 344 fps with an average of 348 fps. That was fairly close but just a bit under the 370 claimed fps. Warmer temperatures could for sure get this Blowback Airgun up to the slightly higher claimed fps.
Next I shot 10 rounds into a fresh paper target 30 feet down range using a semi-rested shooting position, with my hands resting on a sand bag up front, and sitting on a comfortable stool in the back, for somewhat stable shooting. There is always going to be a bit of human factor involved, but I seemed steady on this day, and I did get a nice result for a Blowback CO2 Air Pistol. The Umarex Glock 17 Gen 5 MOS CO2 Blowback BB Pistol shot good for me out of the box. The grouping spread out about 2 inches total well center up and down, just a hair above the bullseye but did wonder off to the left a little bit. Still a very good result for a blowback Airgun.
I was very pleased with the performance of the Umarex Glock 17 Gen 5 MOS CO2 Blowback BB Pistol. It had a lot more blowback action than I was expecting as the slide spring did feel kind of lazy to me when releasing it at first. The velocity was close to the mark and for sure as claimed in a warmer environment, and the accuracy was as good as you are going to get with a blowback BB Pistol. I didn't even mind the double action trigger at all as the first portion of the trigger is very light with almost no friction and even the release is not very heavy but for sure heavier than a true Single Action Trigger. I also like that you are going to get a lot more magazines worth of shots from a single CO2 out of the Umarex Glock 17 Gen 5 MOS CO2 Blowback BB Pistol with it’s semi blowback action and magazine design that seals off the BB into the breach area of the barrel. If you are OK with a DO trigger on a Glock, then I would suggest you chose the Glock 17 MOS Semi Blowback over the Glock 19 MOS Full Blowback simply for the higher fps, better CO2 efficiency and slightly improved accuracy.
Type:Blowback CO2 BB Pistol. Manufacturer:Distributed by Umarex. Model:Glock 17 Gen 5 MOS. Materials: Metal & Polymer. Weight: 1.5 pounds (683 grams). Total Length: 7.95 inches (20.2cm). Barrel: Smooth bore 4 inch barrel (10cm). Propulsion: CO2 x 1. Action: Semi auto blowback, double action only trigger. Ammunition Type: 4.5mm steel BB's. Ammunition Capacity: 18 round drop out full size metal magazine. FPS: Claimed 370.
Trigger Pull: The trigger pull on the Umarex Glock 17 Gen 5 MOS CO2 Blowback BB Pistol is very similar in most ways to a real steel Glock Pistol with the blowback action, which does engage the striker alleviating some of the trigger pull to some degree. That said the trigger is more like a double action trigger in terms of weight and length, as the trigger pull is used to shuttle a BB into the breach, which does require additional trigger length and weight making it more like a double action trigger at the end of the day. The blowback action on this version is not full, but rather partial, so it does not go back as far as the real steel slide would go. The chambering of BB’s and the partial blowback design has an upside allowing for a higher velocity and more shots per CO2.
Accuracy: At this point I have not shot the Umarex Glock 17 Gen 5 MOS CO2 Blowback BB Pistol, so I can only quote what Umarex is saying in terms of FPS which is around 370. As mentioned earlier, the partial blowback action and the way the magazine seals the BB in the breach helps to increase the FPS to something a lot closer to what a non-blowback BB pistol generally offers in velocity. In terms of accuracy I will have to make my Field Test Shooting Video first before I know for sure, but generally a CO2 Blowback BB Pistol like this will get around a 4 inch grouping based on past similar shooting tests.
Build Quality: Being Glock licensed via Umarex, the, Umarex Glock 17 Gen 5 MOS CO2 Blowback BB Pistol has to be made with Glocks high quality standards in mind. I am not 100% sure who actually makes this Airgun, as Umarex is not so much a manufacturer of Airguns, but more of a distribution and licensing company. I am pretty sure that KWC is making this Airgun for Umarex and KWC has for sure improved their quality over time in terms of fit and finish, so I am happy to say that the Umarex Glock 17 Gen 5 MOS CO2 Blowback BB Pistol is a really well built Airgun.
Realism: The Umarex Glock 17 Gen 5 MOS CO2 Blowback BB Pistol absolutely has most of everything you would want in a Replica Airgun, like blowback action, a working slide catch release, trigger safety, magazine release, and full size drop out metal magazine. Its shortcomings would be that you can not easily field strip its and it does have a trigger closer to a double action only rather than the Glock short and very light single action trigger. I can overlook this because it is very well priced and has a nice high velocity along with a lot of shots per CO2.
Pros:
Good weight and feel to it, build quality seems excellent.
Really nice looking and full featured replica of the original Glock 17 Gen 5 MOS.
Fully Glock licensed via Umarex.
Easy to see white dot sights front and back.
Recessed barrel for added realism.
Accessory rail under barrel for adding a laser or tactical light.
MOS (Modular Optical System) on slide for adding a red dot.
Safety built into serial number under the barrel.
Full size drop out metal magazine that holds the CO2 and 18, 4.5mm steel BB’s.
Slide spring is firm, will have a nice blowback recoil effect.
Warning instruction are nice and discreet under the trigger guard.
Not an overly heavy DOA feeling trigger as the blowback pre-cocks the internal hammer/striker but the trigger does move a BB into the breach area.
Because of partial blowback action and magazine design, it has a higher fps and you get a lot more shots than a similar full blowback Airgun.
Working trigger safety like the real steel version.
Cons:
Trigger is more like a DOA trigger which is longer and heavier than a real steel Glock, but not bad.
Sights are non-adjustable which is common with low cost airguns like this one.
Blowback action is not full so not as heavy of a recoil feel as a full blowback Airgun.
Comments:
I was excited when I first saw the Glock 17 and 19 Gen 5 MOS 4.5mm Steel BB Blowback Airguns at SHOT Show this year, and I have been really looking forward to getting my hands on both of them. They both look and feel just as good as they did at SHOT Show, and now all I need to do is test them out and see how they both perform in the Replica Airguns Indoor Sea Can Shooting Range. I know the Umarex Glock 17 Gen 5 MOS CO2 Blowback BB Pistol is for sure going to have a lot more power over the Umarex Glock 19, but the full blowback action of the Glock 19 Gen 5 MOS may take a win over power from the Glock 17 Gen 5 MOS. It may come down to which one is more accurate? I will have to wait and see so keep watching to find out who the winner is in my books.
