Your frame is a Hi Power, therefore your gun is legally a Hi Power for any sale/transfer purposes.
- Trigger pushes up on a 'trigger lever' in frame.
- Trigger lever pushes up on front of 'sear lever' in slide.
- Rear of sear lever pushes down on front/top/right corner of sear in frame.
- Sear rotates on sear pin and allows hammer to drop.
- Slide off equals no connection between hammer and trigger.
- Slide in frame allows it to function.
Note: do NOT hold trigger back when putting slide back on frame.
Also, mag disconnect function in rear of trigger [that presses on front of magazine] further hinders trigger feel.
For those who are interested in the Hi Power, this is a 'must read' site: I have two versions of the book listed there.
http://hipowersandhandguns.com/
Furthermore, the 1911forum dot com has a dedicated BHP section- it is worth dwelling there a lot.
Now, about the .22lr conversion kits- I have experience with both the MACS and Ceiner. These are my experiences.
The named US made Ceiner kit and the Argentinian import, name of MACS, are the two in question.
And I think there was a more rare Argentinian .22lr conversion upper, as I've seen one made by DGFM mounted on a DGFM 1911. That would be a rare one.
The MACS system is more rare than the Ceiner kit, but it isn't impossible to find- unless you only give yourself a weekend.
I had the MACS system, and sold it for a Ceiner system.
- The MACS fired EVERY time I pulled the trigger, however, it had more loading jams.
- The MACS allowed the sear pin to 'walk' to the left, where it jammed the MACS slide/bolt mechanism, and was a PAIN to disassemble.
- The MACS has a threaded barrel and nut to properly tension the system. I am in California, where threaded barrels are a BIG NO NO. [for that reason alone I sold it].
- It was hard to find parts for the MACS system.
- If I lived in a 'free state', I would have prepped my frame and stuck with the MACS.
I bought a used Ceiner system.
- Parts are available in the USA.
- Mags are available in 10 or 15 round capacity, based on state you live in.
- Just order mags and they will send you the legal size you can have.
The Ceiner was not trouble-free though.
- The Ceiner had light strikes. Problem- malformed firing pin tip. Now solved.
- The Ceiner had issues of not being able to pull the trigger and fire the gun.
- Two issues caused this.
[*]The first is the width of the trigger lever [the lifter thingy that pushes up on the sear lever that is in the slide] tip.
[*]I believe it was occasionally lining up slightly on the slide instead of centering on the sear lever.
[*]Problem solved with some recontouring.
[*]
Actually, I used it on a .40S&W Hi Power, that has a recontoured tip, and that issue disappeared.
[*]Second problem, and still need some work, is that the slide would fail to return 100% to battery/lock up, as it would stop at about 98% of forward.
[*]Slight thumb pressure on rear of slide allows shooting, but running it sloppy wet with gun oil also helps avoid this.
Overall, I am content with the Ceiner kit, but my Advantage Arms kit for Glock works better.