I would not pull the trigger initially with a live 22lr round in the chamber.
I assume the spacer is in the back of the bolt carrier?
If the chamber face mates up good:
(test it by coating a 22lr round in graphite or grease and observing the marks made in the coating by the chambering process)
The next step is to try it with an empty or dummy casing. With a fired casing you can measure the primer impact on the casing rim to ensure that it punches reliably.
After that, I'd try it with a 22LR that had the bullet taken off, and powder removed (rimfire primer only).
Working up to a live round at a time, then two, etc.
Chances are a 22LR firint OOB or even exploding even partially in the chamber would damage only the ciener kit anyway, even that would be a stretch.
I'd caution you to do this experiment with the utmost of caution, firing only when you are far behind, or on the closed side of the rifle, with a trigger string, and use protective eyewear, gloves, etc.
Videotape the chamber at high zoom through plexiglass if you need to see it working, or study it. Don't dare stick your proboscis in there.
-- Fargo