3913 and Promags - parts question

[aedavis]

Update from original poster:

I bought 10 Promags and 10 S&W 3913 red/orange followers from Midway and tested them out yesterday (I didn't buy S&W magazine springs because they were out of stock). I ran a couple hundred rounds (124gr and 147gr handloads) through the Promags stock and they ran fine with no issues. I also ran some more through the Promags with S&W followers installed and again, no issues.

Regarding which S&W parts will swap into Promags:

- Followers will swap
- Springs will swap

- Floorplate catch that hooks on bottom of spring will NOT swap
- Floorplates will swap, but leave a large gap - see below

S&W factory 3913 floorplate on Promag


S&W factory 3913 floorplate on factory mag


Promag floorplate on Promag


For now, I'm going to keep the Promags with S&W followers installed and run them. If/when I can get S&W mag springs I'll swap them too, but the Promag springs under S&W followers are working fine. The Promag followers worked fine too, but drug a little in the mag body so I just swapped them out as a preventive measure.

 

[squidsix]

I recommend and use 4040PD mags in my 3900 pistols. They have functioned perfectly for me for years now, thousands of rounds, three pistols, twelve magazines. They are about $25 here and there. Nobody seems to have 4040pd pistols, so the mags are cheap. And they WORK. (and yes they say .40 caliber and also say 7 rounds but they work perfectly with 9mm and hold 8 rounds)

 

[Yaworski]

Here's my ProMag story . . .

Back in the Dark Days of the AWB, I had a business selling mags at gunshows. I bought hundreds of ProMag magazines and sold most of them (I still have about 20 BHP mags, apparently not as popular as I had hoped).

Every customer got a receipt with my email address and phone number. I also did the gun show circuit so people could find me. Out of the hundreds sold, I only had one return and that was because the guy had bought the wrong mag.

I'm sure that many bought mags just because they were hard to get but a few had to get used.

For my 1911s, the only mags that I ever had an issue with were made by Triple-K. I've used the cheapest gun show/GI knock off mags, Colt, MegCar, genuine GI, and some inexpensive Argentine mags with +1 baseplate and they all ran in my 1911s and Ballerina Mollester.