Now I can't compare the Single stack against the PM9 on weight but the PM9 is 16 oz and the I'm sure the 26 is heavier than the single stack and the 26 is at 21.7 oz so im sure the Glock single will be lighter. Trig on My PM9 was 6.7lbs Loooong,But smooth, Glock 26 is at 5.7, I will do more of a review when I have it in my hands. PM 9 price was 679.00 new and Gen 4 Glock is 549.00 , single stack may be cheaper. The PM9 is nice, on the $ for aiming where you want it but for almost 130.00 more, Like I said before the single stack may be around 500.00.