Endomag 9mm tuning/trimming - Mean Arms 9mm Ejectored EndoMag - 3 Pack

I completed my 9mm carbine with a 16" Faxon barrel and a Aim 9mmm Nickel Boron bolt on a set of Andersons. I elected to go with the EndoMags as I didn't like the punie look of a colt or glock mag out of an AR lower. At $30 each or $80 for three, these are not cheap mag inserts, plus you still need to buy 3 pmags at $10 each if your lucky to find them. My first experience was there was limited info on how to install them and had to search YouTube to make sure I was doing it right. The Extractor is just a plastic tab, that hit my Aim bolt on the first closure and prevented it from closing. Apparently this is normal operation as they require "Tuning". Well after several slam sut bolt releases, it did function. But the case ejector plastic tab was gouged up pretty good. It was also very difficult to insert on a closed bolt. This I found, was due to too much height of the ejector tab. So I held my breath and trimmed it with a razor blade, lightly and smoothly a little at a time. One can see this when closing the bolt slowly and observing the contact point. I was successful at trimming all three mags and using 5 dummy rounds, I could hand load and eject all the rounds. I then proceeded to trim the capacity restrictor as in my free state I can have 30 rounds... This also required a bit more trimming than what the directions call for as you need to cut all of the "V" off where they tell you to, not just in the middle of it (Directions has a picture of where to cut). It was the difference between 29 rounds fitting and 30. I then went to the range and shot 10 out of each (ammo to scarce at the moment to just blow away). Results were flawless all three mags zero FTF or FTE and bolt locked back on empty ech mag. How long these will hold up is anyone's guess but after my trimming I could no longer see any visible contact wear, but that was also only 10 round each mag.... We shall see after November if ammo is more readily available.