With my new Hi-Power, I also purchased two 10 round Mec-Gar mags in 9mmP. They do not have the mousetrap spring like the Browning ones do--more on this aspect in a moment.
The Browning mags (which came with the pistol) work fine. The Mec-Gar mags though do not. They make the trigger pull gritty and sticky. Also, with the Mec-Gar ones only, the slide has locked back with one round left.
I took the Mec-gar mags (with the pistol and original mags) back to the dealer from whom I purchased the pistol to show him my problem. He could not tell any difference in the trigger pull and thought I was nuts. I left the Mec-gar mags there over night so he could call Mec-gar and ask them about it.
Mec-gar said the magazines are the same as the Browning ones except for the mousetrap spring, which Browning only wants on the mags they sell under their name. Otherwise, my mags measure the same as what Mec-Gar says they should.
After this conversation, the dealer refused to refund my money. I swear though the aftermarket mags affect the function of the pistol. Just to be sure, I removed the mousetrap spring from the Browning mags and tested them in my pistol. Without the spring, they do not drop free. In contrast, the aftermarket ones do.
So, there is a difference between the Mec-Gar ones and the Browning ones, although they are made on the same equipment in Italy. The Browning ones fit more tightly. I think this tighter fit engages the magazine disconnect better to make the trigger pull smoother. When the mags are unloaded, the followers on the Browning mags are level while the Mec-Gar ones rest at an upward angle.
Bottom line: I have two 10 round aftermarket mags that do not function properly in my pistol while there is no refund or consideration coming from either the retailer or the manufacturer.
A friend suggested that once I have the pistol and magazines tuned together, all the mags should work properly. We will see.
[This message has been edited by Drago (edited 10-12-2001).]