I have the MecTec for the G-40. Also the G-17. Had one for the 1911 as well.
A bit heavy for what they are. Consistently reliable with a wide range of bullet weights and power levels. The 10mm kit fired the .40s&w with the same reliability. Built pretty rugged.
Accuracy was a bit surprising in all 3. Much better than expected out to 100yds. My friends dubbed them the "giggle sticks" Fun to shoot, eats ammo faster than you would ever believe. Even the lowly 9mm is nothing to sneeze at coming out of a 16" barrel. The velocity is reminiscent of a 357mag out of a 4" pistol. The .40s&w should be impressive as well.
There won't be anything short and weak about it.
Just aquired a G-41 lower specifically for another MecTec CCU in .45acp. The other two have dedicated lowers as well.
About the only thing that would make them better is if Glock would make 33rd 10mm and .45 magazines.
Dandy little carbines for HD or a great truck gun with all the crazy unrest out there. A bit pricey, but IMHO worth it.
I have the wire stocks, Vortex red dot optics, & flip-up irons. The 10mm unit rides in my harley's trunk on long rides through the PNW mountain roads, the G-40 tucked under my jacket. Some of the local wildlife isn't freindly to humans and some of the locals along those back roads don't like "tourists "
Good investment if you're thinking of getting one. But, I'm sure you know that you can get a decent AR for about the same $, and even less if you shop around.
The selling point to me is that I've always had an affinity for pistols and handy little carbines that share the same ammo. These share magazines as well as the same controls.
It works for me.