These magazines are not as well internally finished as other SIG magazines I own. They required cleaning/lubing out of the box and a mag loader to get them to load. The mag release notch could also be polished or reshaped to allow for easier loading as rounds tended to hang up there. Once loaded I didn't have any issues with them and I'm hoping they smooth-up with use.
Mighty 12 Count Magazine a nice addition to the SIG 365.
Of course the 12 round magazine is a large geometric gain in firepower. The number “12” satisfies all requests for more rounds in a tight, well built, very small concealed carry weapon. My only complaint is the almost impossibility to load any of the SIG 365 magazines beyond a 5 count. I wrestled with all of the clips for over 20 minutes trying to stuff more bullets down into the clips. My fingers were bloodied up, and the maximum crammed into the super sprung clips was 5. I had to buy a mag loader. Solved all of the loading problems, mags are fully filled, gun never a jams, a very tight package. Precision come to mind.