Forgive me if this is a noob question/suggestion but, maybe the problem is more with the mag springs than the RSA? Maybe stiffer mag springs are needed? 

Just thought I'd give a little update here.  I bought my G20 gen4 a few weeks back, shot it the day of with 40 rnds of 200 grain pmc bronze.  I had 3 FTFs on the very last round.  I had loaded the mag with 10rnds 4 times.  Did some reading on here, saw some guys having similar issues and suggested changing out recoil springs and such but before I did all that I wanted to test mine some more.  I ordered some 180grain HP XTP from Underwood since that is what I wanted to keep in the gun for defense.  This go round I loaded the mag 3 times to capacity of 15 rounds and only had one FTF... the very last round on the very last mag.  So for now Ill probably leave the gun as is and try some Underwood 180 TMJ in the future.

Hello all!  New member from NC.  I work as a nurse in a cardio thoracic ICU with open heart patients.  Just bought a Glock 20 gen 4 this past week and absolutely love it.  Very eager to learn more about the different loadings which has sparked my interest in reloading.  My daily carry is either an LCP or G26 and also have a Sig Tac Ops 1911.

Grant

Good info on here.  Just bought my first 10mm, Glock 20 gen 4, last week.  I shot a total of 40 rounds (filled the magazine 4 times with 10 rounds) and had 3 FTF's.. not a good percentage as far as reliability goes, especially for a Glock.  I was using PMC bronze 200 grain ammo.  Other than that it was a blast to shoot