After an earlier video showing how fast this German 7.62 NATO / .308 Win plastic training ammo actually goes, some doubting Thomases in the comments weren't satisfied.

Also, I promised a closer look at the stuff, including a disassembly of it. So finally, after 2 years, here it is: German Kurzbahnpatronen Redux! With the help of a Sterling 7.62mm Lee-Enfield No.4 conversion! Also includes a picture of the lightened straight blowback bolt for shooting this stuff out of an HK G3.