Extend your Glock 21/41 from 13, to a full 17 rounds of firepower! Built for USPSA's "Limited" Division, the finished magazine is 140mm long, as measured down the back (versus about 120mm stock). Also works (as a +5!) on the 10mm G20 -- but the newest followers will not accept G21 springs (the .45 ACP follower can be modified to work on the 10mm). Ships with a custom-made Wolff spring. Due to U.S. State Department restrictions, we cannot ship this part internationally. HISTORY: Glock's early .45 ACP mags used a 9mm-width spring -- with mixed results. The newest design uses a full-width spring, eliminating the problems of the earlier style. When the wide springs became available, we re-designed our old G21+4 to take advantage of them -- and extended the length to fit the new USPSA gauge at the same time. The result is a +4+ situation that's simpler and more reliable than the old skinny-spring G21. NOTE: Our new springs don't fit the older skinny-spring followers very well. They will work, but you're better off getting new mags with the new chisel-nose followers.
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The product is made well and works as expected, but I feel it is over priced because it is plastic. Base pads I have purchased in the past have been machined aluminum. That being said I would like to see a larger one for those who prefer 45/10mm.
NOTE - Delrin is a high-tech material which we mill (not molded) to the same standards as our other metal parts. Delrin in bar form is almost as expensive as Aluminum hence the cost. If we used a cheap plastic, we could not mill it to the same standards or apply a lifetime guaranty to it.
After I shot it using the old 13 round mags, and the mags popped out after each round, I bought 2 new 13 round mags. I put it all together last night, and shot them both at a match tonight, and they were splendid. Thanks.