.22 upper on limited large frame

[e-mishka]

Who has one, how is it that working out? Any issues?

Im thinking to order one from eaa, just want to hear your opinions

[Mo Hepworth]

i had to use a heavy hammer spring. i made a new firing pin. after that it worked fine. use round nose...feeds better. i had good results with winchester 333pks.

[e-mishka]

now i have 13lb hammer spring, what should i move up to ?

made new firing pin? please elaborate.

[kneelingatlas]

now i have 13lb hammer spring, what should i move up to ?

made new firing pin? please elaborate.

I've owned both the large frame and the small frame .22 conversions and in my experience they need at least a 15# hammer spring to reliably light off primers and a high velocity 40 grain bullet to cycle the slide. I believe with a longer firing pin and some spring work (maybe some slide lightening) it could be made more reliable, but I didn't have the time for that project. I did throat the chambers which helped with feeding issues. Nealio bought my large frame, so maybe he got it working better?

[Nealio]

I've been having troubles getting mine working good. My goal is to be able to run it with a 13lb hammer spring. I made a longer firing pin, but I haven't had a chance to test it yet. Also I cleaned up the extractor where it hit the barrel as that was dragging a lot.

Currently it runs AWESOME (super accurate, tosses brass good) when its clean, but for some reason the chamber loads up with gunk easily. I've tried 6 different brands/types of ammo, and the same thing happens. My buddy theorizes that I've got it moving soo free that its moving out of battery pre-maturely.

It runs great for 30-50 rounds, then starts to have chambering and extraction issues. If I just run an empty case in and out of the chamber a few times, its good to go for another 30 rounds or so.

Next time I go out I was going to try stiffer recoil springs to see if that helps and also see if my longer firing pin works with the 13lb hammer spring.

I think I can get it working, I've just been working on other projects.

[e-mishka]

Nealio, please keep us posted of your results.

[Mo Hepworth]

I don't foresee using a 13lb spring as reliable. I actually keep a 16lb spring with the kit and change it out when I use it. if you are having ignition problems, check to see if the firing pin is hitting on the rim,...as it is a rim fire. It should be hitting at 12 oclock.

[Nealio]

So I ran my .22 upper today with the longer firing pin ,13lb hammer spring, and 6lb recoil spring. It worked just OK. Had a lot of FTE's (2 per mag) My extractor isn't in the best shape, so I don't know if that's it or if its not cycling back as far as it should with that 6lb spring. Its hard to say which, or maybe its both.

I also had a couple fail to fires, but that was always after I had a FTE and plucked the empty out, so it might have been related to it not being 100% in battery. It seems like when everything was perfect it ignited just fine, so I think I may take down the spring weight on the firing pin just a tad, and sharpen it just a tiny bit.

I'll keep you guys posted.