Whos insulting? Look.. I actually own some of the Sigma promags. Its obvious most if not all in this thread have not. That gives me experience with these particular magazines in question and Ive been using aftermarket magazines and tuning them to function since shortly before the days of the 94 AWB when you basically had to convert magazines and learn different formulas of followers, spring strengths etc to get them running.
Im not all that young and this notion of calling "Old Men" some sort of experts because they have never tried the product in question is kind of laughable. It takes more than reading about something on the internet to have actual experience.
As far as 3 gun matches go I dont think that hs anything to do with what was being asked so I dont know where all that is coming from unless its some sort of ego propping going on there. I have nothing against 3 gun shooters. Theres a lot of accessories people use in competition that are not really things I would consider practical for CCW though. Regardless of that when I actually read the thread the question at hand was about promags and particularly Sigma/SD promags.
Never said these would be ideal for something like CCW. LOTS of things are not CCW friendly in one way or another. ETS nor Triple K even make magazines for Sigmas so I dont know why thats even in question but I will say the ETS magazines upon handling look like or are close to being a polycarbonate magazine and thats going to be a very fragile magazine so while the see through magazine is neat for some its going to be a handle with care magazine. I think the only polycarbonate magazines I have used long term that have survived decently are the butler creek steel lipped Ruger 10/22 mags.
My favorite magazines are Mec-gars for the most part but I would rank Promag second in terms of aftermarket manufacturers that make magazines for a wide line of firearms. The overwhelming majority of the standard capacity magazines work fine. Where things get dicey is with 32rd 9mm extended magazines and that is just due to the cartridge itself in combination with the traditional pistol double stack single feed magazine design.
Normally a 9mm pistol magazine will start running into problems right around the 22Rd- 25rd market for the double stack. This is due to case taper and nose drop. If you look at the newer Beretta 92 factory OEM 30 rounders you will see a rib running down the sides. Same Rib can be seen on the XDM extended magazines. In a single stack 9mm start to typically have nose drop problems around 9 or 10 rounds.
Obviously this is not for "Carry" use though. I dont see anyone walking around with 32rd magazines hanging out of their carry pistols let alone a drum mag.
I would run promags in my Sigmas for carry if I had no other choice but Im not sure I would trust them outside of Ball Ammo because Im not shooting hundreds of rounds of pricey boutique self defense ammo at the range when target shooting.
My biggest beef with promags SD/Sigma mags are their magazine springs. S&W uses a minimalistic follower in their magazine design similar to the glock which is unfortunate but they manage to get away with it. Lots of tilt in that approach though compared to something like a 5900 series magazine. Its unfortunate promag didnt beef up the springs at least to factory S&W standards but they tend to stick with the same gage wire for every magazine and as far as I can tell there is no substitute for the spring promag uses on the Sigma mags because the follower is a little different. It would take either making a spring or trying to modify something like a glock 18 33rd + Power magazine spring to work. Standard size mags its not as much of an issue.
Off hand I will list just some of the "Garbage" promags that have been 100% for me in more popular pistols that have been around..
Beretta 92 15 & 20 round mags.. PASS
Taurus 92 15 and 20 round mags.. PASS
XD 16 and 20 round mags... PASS
Smith And Wesson 5900 series 15rd mags... PASS
Ruger P Series 9mm 15/20rd and 45acp 8 round magazines.. pass
Bersa Thunder 9mm 15 round magazines .. pass
Walther P38 8rd Magazines... pass
Hipoint C9 8 round magazines ... Pass
Sccy 15 round magazines... Pass
Ruger LC9 8rd 9mm... Pass
S&W Sigma.. see above post
The only major problems I can recall running into with promags are the extended 32rd magazines. Sometimes its curable and sometimes its not. I know I have to use a VERY strong straight blowback submachine gun magazine spring along with a very slight alteration of the feedlips on the 30rd micro 9mm magazines to get them 100% but thats basically due to the lightning fast cycle speeds of all these micro 9mms. They do run 100% though. Am I going to walk around CCWing one of my Keltec P11s with a 30 round mag sticking out.. of course not.
But hey.. what do I know? I just own and using magazines since the late 1980s along with Mecgar, Wilson Combats, Checkmates, Ramlines, U.S.A. Brand, Triple K, Factory OEM, Nationals, Chip McCormick, ACT etc. etc. Better people just listen to whomever on the internet with no real real experience (let alone learning how to make them function of problematic). Fly bye comments with no actual useful info and ego blustering is all that matters these days I guess. Gun snobbery has devolved into magazine snobbery I guess. Strange to see such attitudes in a Sigma forum as its one of the most bashed handguns of all time.
When I eventually try their Drum magazine for the Sigma I will post a short review. I have only ever encountered one promag drum and it was for the Ruger P89 in 9mm. It worked. There are no LRHO features on the promag drums though from what I can tell due to how Drum Magazines have to be designed. Im not into Drum Magazines much but they are interesting and as I said earlier there is not a whole lot of aftermarket for the Lowley Sigmas out there these days.
*****ALSO...Anyone throwing their Garbage magazines in the trash let me know. I will pay shipping. Some of these older aftermarket mags can be hard to track down.
If you do get a bad promag I suggest you call them. They will basically bend over backwards to make you happy and although Ive never had to send one back I have called and gotten new components a few times freshen things up. The only time I have ever encountered something like feedlips cracking is on their 1911 10 rd magazines and that just comes with the territory on most 1911 mags.