I searched and read all 13 old threads before posting this question. I have a bunch of Mech Techs for our G21's and the whole family just loves them. I just got a 10mm for a G20/21 and will start reloading this weekend. I am thinking about a slower burning powder to utilize the 16" barrel and get better velocities. More of a powder for 44 mag with longer barrels. 30-years ago we used 2400, then 296, some pistol caliber carbine users and cowboy action now use LilGun. I have most powders but will buy whatever I need to try. The powders that we have a bunch of are; Power Pistol, LilGun, 231, and some 2400, 296 but will buy whatever works well. Been wanting one of these for a while, I saw a post where a member put a 2-7x scope on his and I am thinking along those lines I got a 1-6X so it could be shot 1X up close both eyes open like a Red Dot or zoom to 6X for longer shots or target shooting. I read the high capacity mag mod threads too, we already have a bunch of Kriss and SGM mags for the 45 so it's really getting exciting now. Don't know if you have seen this but on Mech Tech's home page right in the middle has a video link "Can 45acp be consistently accurate at 100-yards?" http://www.mechtechsys.com/index.php That short video they are shoot 10- clay pigeons at 100 yds then drop down on a small steel plate for a 20-round group with what looks almost like Gold Tracers. If you go full screen you can watch the group as they shoot fast and it ends up Golf Ball sized group on that painted plate at a 100-yards. At the end of shooting they pan back to show you it is really 100-yards.