Other than a couple brief mention, I have yet to talk about Mr. Engler on Grey Ops. This is a bit of an oopsy on my part, as Mr. Engler has done a lot for the milsim paintball community for a long time.
So, who is he?!
Well go browse Eric's website for a bit and you'll see why people talk about him so much.
In a nutshell (or should I say clamshell [it's a Tippmann joke, don't worry about it]) Mr. Engler takes various Tippmann markers and real steel parts, and combines them into custom made creations.
Here's a video of Mike from TechPB shooting an Engler MG-42:
And a video of Engler showing off his clear paintballs and a Q-Loaded PPSH: