Inserts: 
1911 - Fits Single Stack Magazines 9/40/45
2011 - Fits 2011 & Double Stack Magazines - P320, M&P, VP9, ETC
Glock - Fits Glock 9/40/45
Glock19 magazines are the shortest  you want to use in these pouches. Will not work for Glock26 or similer magazines they too short in height.
Glock 43X - Fits 10 RND Factory and Shield Arms S15
P365 - Fits 15 RND / WILL NOT FIT 10 RND
 
*esstac will be phasing out the PALS webbing on the rear of Kywi pouches with Brookwood Laminate Squadron laser cut PALS backers. Squadron is currently in use with many of their current pouches. 
 
During the transition, orders may contain pouches with webbing, the new laser cut backer, or a mix of both.
 
There is no guarantee of which version you will receive.
 
Midlength Pistol Kywi pouch, works well with the newer Glock 24 round 9mm and 22 round 40cal magazines and +5/6 round extensions for FULL sized glock mags.  Glock +2 extension work but not ideal due to the limited length stickout out.  Not ideal for standard G17 mags with no extension and Glock 19 mags are to short no matter the extension.
 
Midlength allows for 1inch lower placement on a belt, allowing for easier manipulation and less interferance with armor.
 
There are 4 rows of webbing on the back of the pouch. You only use the Top 3 rows of webbing when mounting (not 4).