Good in CHECKMATE Mags
If for some reason you're lucky enough to have some military issue Checkmate Magazines that weren't properly disposed of you may want to upgrade to these. With old springs I would get Fail to Feeds, especially with Winchester Steel 9mm. I believe the interior of magazine and Dry Lube on shell casing actually caused friction, resulting in some non-feeds, (my opinion only). When I shot brass, or staggered Win/steel and brass they fed better. These new springs are notably stronger than factory springs. All the Checkmate Mags I put these in had Win/steel feeding and loading just fine. My FS92A1 was eating ammo like a fat boy eats cake! The mags were free, so 12 bucks for springs were an easy pill to swallow. GOOD SPRINGS!!!
