Forums

Typically AEGs will find longer barrels more difficult because of air volume issues. The gearbox only has so much air to push through the barrel, so if you have more barrel volume than cylinder volume your BB will stop accelerating and start decelerating while it's still in the barrel. However, if you have more cylinder volume than barrel volume you will end up wasting a lot of air as there is more air to push after the BB has left. This makes it a bit louder as you get a more noticeable pop as the BB escapes the barrel and the air expands, but it can also have some issues that I can't remember. All I remember is discussing it with a tech and he told me what happens but I can't remember exactly what he said, I just remember it sounded like a valid issue that I wouldn't want.   For HPA it isn't such a problem because you can typically adjust your dwell depending on how long your barrel is, allowing more air to released per trigger pull in order to properly fill the barrel. A properly volumed HPA setup will joule creep like a gas gun.   For gas guns, the problem with longer barrels is joule creep. With a gas gun the BB will constantly accelerate through the barrel as the gas constantly expands through it, much in the same way a bullet will accelerate more through a longer barrel than a shorter one. So when you have a heavy BB, which starts and moves slower than a lighter BB at the same energy, it will have far longer in the barrel to accelerate and will leave with a far greater muzzle energy than a short barrel due to the relative increase in energy imparted through the longer acceleration.   All that said, you don't need a long barrel to have a "DMR" as it's just a designation in airsoft of a rifle that is semi-auto locked and typically has a higher energy limit and an MED. However, I'm a bit of a purist and am of the belief that a DMR should at least look like a DMR, so a 14.5" or 16"+ outer barrel is a must in my opinion, and then I'd just get an inner barrel that will go all the way through it. If you're going HPA, the only thing I would watch out for is joule creep, however you can easily fine tune the power output by tweaking the psi on the regulator to make sure you're within your site's limits.

Yeah CETME was first, some Germans went to France after the war, then Spain, worked on a new gun based on the StG45.  Eventually (after lots of iterations) the Spanish adopted the CETME in 762 NATO in the late 50s and the Germans got a few along the way.  Those guns became the basis for the G3.  That's the super compacted version.   If you look at the metal base/sockets on stock of the Stg44, 45, CETME and G3, the single pin at the bottom that holds them and the rough shape of TMH/lower receiver on each you can follow the lineage along pretty nicely.

My main concern if I were a potential buyer, would be this guns history. You see these come up in the classifieds all the time, with one dark and/or blurry picture on someone's duvet (usually also featuring the photographers feet).   "I got this off a mate, who got it off some bloke at a game day. He reckons it's had some upgrades, dunno what or how old it is. Please give me £20 less than retail. Collection only, thanks"   Put some effort into the ad and you may get around 60% of the new price. Hopefully you can at least recall how much you paid?