Well, this one has been a mix of fun and frustration:
When I first got the 22/45 Lite, I mounted the rail to the top of the barrel/receiver. I was pleased to see the iron sights were usable with the raik mounted and basically zeroed already. I then added the Burris Fastfire 2, which required a special mount afapter between the Fastfire and 1913 rail.
As soon as I saw all those screws (3 for the rail, 2 for the Fastfire to mount, and one for mount to rail) I was skeptical; but I thought "Well, it is only .22LR". I then added the Silencerco Sparrow suppressor. On my first run, I was just really pleased with it - quiet, cheap to shoot, great accuracy, ran well with all different kinds of .22LR whether suppressed or not, lightweight and no big zero shift between suppressed and unsuppressed.
However, I had some difficulty getting it to hold zero. The various mounts, rails, etc. kept loosening and shifting. I finally busted out the Loctite on the rail and spent an hour getting the thing rezeroed both suppressed and unsuppressed. Got home from the range after everything was zeroed and the darn Fastfire was loose on its mount when I pull it out of the case
So I tighten every blanking screw on the rail, mount, and Fastfire and head to the range again. Pleasantly, the unsuppressed zero was dead on without having to mess with it. I removed the thread protector and attached the suppressor - however I failed to notice the tiny little washer Ruger uses behind the thread protector was still stuck on the muzzle.
So the next thing that happens is a tight, consistent group but in a totally different place - and one of the shots is a long lengthwise tear through the paper that looks suspiciously like the bullet might have nicked the baffle and tumbled. I wrote it off to maybe two shots being very close to each other and looking like a tear. So I ripped off two more mags and got the same group shift (no more weird impacts though).
So before I start making major adjustments in the zero again, I decide to try it unsuppressed. As I'm looking for the washer to put the thread protector back on, I realize it is still on the muzzle. I get a sick feeling in my stomach and disassemble the suppressor - which is a pain without any tools as it is carboned up and sticky. I finally get it done and thankfully, no baffle strikes - everything looks OK. I then get it put back together and on the pistol correctly.
I shoot at the target and 10x with the suppressor mounted. Almost the same exact zero as the unsuppressed group. Finally! I decide to run a few mags through for fun and blankety-blank, if the group doesn't shift down 3" but stay tight. Turns out the suppressor has worked loose a few turns and now it needs to be retightened
I finally get everything working and am on my last two "fun magazines" and the front sight is backwards on the gun. It is also held in by a screw - which has also come loose and allowed the front sight to rotate freely.
It is great fun when it is all working right; but it sure has been a pile of frustration compared to the reliability and lack of issues from of my "serious" firearms.