It's about time I picked up another Glock, this will be my third as I have a 17 and a 27. Looking for a large cal., more for the woods as well as HD/range. Maybe some hunting after adding a longer barrel. I think 10mm is the way to go here. I started toying with the 10mm cartridge and am really liking it. Got to plink my buddy's Delta not long ago and I was blown away by it's accuracy and power downrange. Anyway, I'm a 1911 guy, most of my guns are 1911s so I am rather familiar with the .45 ACP cartridge. So, in a way I do want something new and different. I will primarily be shooting 10mm, my understanding is that I can buy a G21sf and drop in a 10mm conversion barrel. I see KKM makes a barrel for this application. My question is reliability. How reliable are those "drop in" conversion barrels? Would you trust these barrels for HD? If I'm going to be shooting .45, I'll more than likely be using one of my 1911s. The 20 is $50 cheaper than the 21 in my neck of the woods (can't find a 20sf RTF2 though). I saw pics of a 21sf RTF2, did they start making 20sfs with the RT2 frame yet? Not sure what way to go...20 or 21. DH Wanna kill these ads? We can help!