Obviously, the GMG is much more than a typical 'airgun', but still does not approach full auto firearm territory. The GMG shoots at a muzzle energy 4X that of the Drozd, and 'flows' energy downrange at 6.5X that of the Drozd. This graphic is important because it shown just how massive of an airgun the GMG truly is. Other good names for this unit would be "destruction capability", the " FSU factor", or a measurement for the airgun's " funness". In other words, this measures how much energy the gun pushes down range per minute. The second bar is what they call energy flow which is the projectile energy multiplied by the cyclic rate of fire of the gun. This is a good measure of how hard the projectile 'hits'. The top bar shows muzzle energy which is projectile velocity multiplied by projectile mass. The values range from lowest on the left to highest on the right. Now, what exactly does this mean and why should you care? The 2 colored bars show 2 different performance values for all those guns. I've attached the image below ( click for full view): This makes the airgun highly versatile, reliable, and powerful (because the shell design allows for closed-breech firing unlike the Drozd).Īnd just how powerful is the beast? Well, they made a nice graphic which compares the GMG's muzzle energy and firing rate to other airguns and even some full auto firearms. A shell catcher (similar to a brass catcher) will collect these shells for reuse. After firing, the shell casing is ejected out the side of the airgun. This allows you to load any projectile you like into the airgun, and the magazine will feed the shell up into the GMG's valve and shoot out the projectile. The inside of which holds a pellet, or lead round ball, or basically anything 22 caliber. The airgun uses these red plastic shell casings.
Speaking of shell casings, let's look into how the GMG works. It comes with a top picatinny rail to mount whatever red dot you like, and it also comes with a net bag 'shell catcher' which collects the plastic shell casings as they are ejected. The GMG has a 50 round removable magazine, 24" rifled barrel, 4 rail mount locations, non-cycling charge lever, and a 1/8NPT inlet for connection of a remote line from any common HPA/Nitrogen paintball tank. The thing weighs 7 pounds for cry'n-out-loud!
FULL AUTO!!! The GMG is a full size all metal bullpup monster of an airgun. It is still semi and full-auto capable, and fires 15.4gr lead balls over 600fps!!! That is a smokin' 13 ft-lb of muzzle energy. I would highly recommend buying an extra stock magazine.The GSMG airgun prototype introduced by a few years back has now been upgraded to the GMG airgun. run of 100! Not ready to shell out that kind of cash in a market that doesn't exist, or may never exist.īTW, for you daring do-it-your-selfers. Best price I've gotten so far is $5.75 per o ring, min. I was planning on manufacturing the Modified Piercing Plug from stainless steel on a CNC Machine with a split, screw-in handle at the bottom, but I'm having one heck of a time finding the European Metric 15x3u-70 O ring Shore Durometer 70a used by Umarex. That was the easy part! You get one shot at step 2 or kiss the plug goodbye! With the proper drilling depth I was still able to utilize what little was left of 6mm Allen socket to screw in the plug, which is not necessarily mandatory because the plug could be screwed in by hand from the secured pipe fitting. First, I center drilled the piercing plug with an 1/8" drill bit. This is a somewhat tricky procedure using the correct depth in drilling with a 21/64" drill and an 1/8" NPT bottom out tap to obtain at least 3 threads to properly secure the pipe fitting. I've already tackled this one two months ago and it works just fine! With the use of 3/16" OD 2000 PSI High Pressure Nylon Tubing.