maybe I'm a Glock fanboi.  maybe.....
picked up a G47
in case you're not familiar with the 47, it's a full size/17 size frame and grip with a shortened dust cover so can put a gen5 G19 slide and barrel on it and make a G45, a full size grip with a compact slide and barrel
or put the full size slide on the G19 compact frame and grip and make a G19 long slide
so with these 2 pistols I can make 4 pistols
it uses a G19 barrel, and recoil spring and guide rod
I installed a set of Trijicon suppressor height night sights (rear is orange, front is green, dot is red), and Holosun 507C.  also have Apex trigger and extended mag release will install soon
for me, part of the attraction to a Glock is the modification part.  I like to modify things.  guns, cars.  anybody can buy a fast car or a great firearm, but real men build it themself!   
can't wait to test it out 

Installed the Apex trigger, and Strike Industries extended mag release, and a couple other cosmetic parts
I like mag release bc it's a polymer body and aluminum face, so easier on the plastic Glock mags. Comes with 2 faces, 1 is slightly bigger
The trigger is a little lighter,  crisper break, shorter take up and reset. The take up is only slightly better but can feel the wall better and reset is definitely shorter. And I like the flat trigger better

Swapping slides
Top pic is the 47 on top, 19 on bottom. Factory configuration
Bottom pic is 47 on top with the 19 slide, making a G45. And 19 long slide

it's Glock o'clock! 

with the Apex trigger, it is 3 lbs 13.6 oz on my Lyman gauge.  avg of 5 pulls.  crisp break, crisp and short reset
not bad

Nice! Wish Glock came out with the 47 earlier.
Did the same with my ss mr920L and xr920...four configuration. Would've gotten the 47 and save some $ since I already got a 19