This year at SHOT Show Las Vegas 2019 Umarex introduced some new Glock's, a New Beretta and a new Pellet Rifle which unfortunately was not brought to my attention when I did my Interview so sorry now coverage of the Ruger 10/22 CO2 Pellet Rifle :(
Starting with two new CO2 Blowback 4.5mm BB Glocks, Umarex now has a Glock 17 Generation 3 partial blowback CO2 BB Glock with a full size drop out metal magazine. This setup will increase the fps a bit since it uses the more efficient partial blowback system. If you would rather have a full Blowback CO2 BB Glock then Umarex has it in a Glock 17 Generation 4 version that functions pretty much like a traditional Airsoft Blowback gun but instead this one uses 4.5mm steel BB’s.
In terms of Blowback Airsoft Glocks Umarex has a two Glock 17’s, yo can get them in generation 3 or 4 an both are full blowback with full size drop out metal magazines...