75B/SP-01: what is required to shoot 9mm major-comped barrel and ???

[newageroman]

THIS BUILD HAS BEEN FOCUSED ON THE SP-01 SAFETY MODEL VS THE 75B

OK, I've been lurking on the race gun forums some more and got the itch to jump back in to locals this season. Limited Minor mostly, but I'd like to try 9mm major and open just for the fun of it. Of course I've blown all my gun funds on things like water, gas, paying off the car, hubs for the Bronco, food and Christmas presents - so I'm looking to do it on the dime.

I have a good limited gun 75B SAO Cajun.
My main questions are surrounding this platform:
Will this frame take 9mm major loads?
Will I need anything besides a threaded 9mm barrel for a 75B and a comp? Assuming barrel will need to be reamed are reamers ~$50
Which basic comps are good for this setup?
Planning on also drilling the frame for an optic mount and thumb rest, but that would be a little down the road?
Can discuss load development over in the other subforum if needed. Currently load 9minor on 650, ammo shouldn't be a problem.
Cost of all this?

Other options:
I have an S2 on layaway(good price), but I'd like to leave that stock for now and maybe use it to trade up to a TS.
Have a stock SP-01 that I could move ALL my Cajun parts over to if the SP-01 frame or slide have a definitive advantage over the old Standard 75B milsurp frame. I do LOVE the 01 frame (and S2 frame) beavertail over the stock 75B, but I'm planning on smoothing out the old frame if I run with this project.
Buy an 01 frame or SA frame or TS frame and build off that. I'm guessing this will cost north of $300 so not really appealing

Other planned mods:
Drill frame for S2 mag release, install S2 safety, smooth beavertail and under trigger guard, magwell, maybe drill for the 01 guiderod or guiderod set - particularly if this will help take up the burnt of 9mm major (from frame longevity standpoint).

Will I still be under-gunned, Yes.. but it will still be more fun than my usual sat mornings. With these mods I just might be able to beat and old lady or 13 year old and that will be a step up. If everything works and runs, the major detriment would be round count. I'm already used to that limitation and just count it as practice so I'm good with that.

[rckendall]

Following. Anxious to hear responses.

Richard

[2morechains]

Open division in 9 major is an expensive rabbit hole to go down.  Be prepared to invest $$.

I’m assuming your matches are USPSA?  If so, have you considered configuring one of your existing pistols into a Carry Optics gun?  IMO, CZs (the Czechmate not withstanding) are better suited for Production, Limited, or Carry Optics divisions. 

[newageroman]

So its slow at work today and now I have more questions about barrels:
This page, has some options that might work: https://czcustom.com/cz-parts-all/barrels-complete-upper.html
Particularly these:
https://czcustom.com/cz-parts-all/barrels-complete-upper/czc-barrel-threaded-9mm-75-sp01.html
https://czcustom.com/cz-parts-all/barrels-complete-upper/cz-75-barrel-9mm-6-00-standard-ext.html
https://czcustom.com/cz-parts-all/barrels-complete-upper/a01-barrell-9mm-threaded.html
https://czcustom.com/cz-parts-all/barrels-complete-upper/cz-75-barrel-czechmate-9mm.html

The cheapest option looks like it might be the long barrel and just get the barrel threaded locally or add some popple holes.
The other barrels are for SP-01, TS, or checkmate. Not sure how much fitting and filing would be required to fit my 75B or SP-01 frame. I'm good for minor fitting, but would like to minimize some of that if possible.

Also I'm guessing that the longer barrel will be better for building gas to work the comp. But would hinder draw stroke potentially and might look weird (really don't care about looks on this one). Any other advantages/disadvantages of running a longer barrel? Would it be easier/safer to run 9mm major with the longer barrel?

[newageroman]

Yes, USPSA.
What is particularly expensive about it? If the 75B or SP-01 frame/barrels can take the pressure, I might be able to deal with the rest.
I have no interest in production or carry optics. If this isn't possible, I'll just stick to limited.

Edit-----------
more example like this: https://www.flickr.com/photos/fll1911/sets/72157623764894448/
https://forums.brianenos.com/topic/104148-cz-open-9mm/

[Earl Keese]

You've already visited this thread, right? I think kneelingatlas is pretty much the go to guy on the subject. He may even have a finished upper you could buy, it's worth asking him.

https://forums.brianenos.com/topic/265569-cz-open-build-theory/

[newageroman]

I think I have read that thread, but its good reading for sure. I've recently read many threads with his avatar leading the way.
Thanks!

Edit------------
Actually, no, I had not read that thread. Very interesting reading. So it looks like the main issue is to get a threaded barrel and slowly work your load up.

So I'm wondering now what threaded barrel will require the least fitting to my 75B frame. Once that is sorted out i'll check out comps.
I was just thinking of getting a longer non-threaded barrel and then add the popple cuts and holes, but after reading up a bit, it seems like the combustion chambers in the bigger boxed comps would be better way to go.

Stay tuned - may be a while, but I'm keenly interested in this now.

[newageroman]

Annnd... looking at the barrel differences between the 75B and SP-01 - the barrel diameters are different - the 75B has an OD of 0.50" and all the SP-01 and TS barrels are 0.55" OD. So... again the question now goes back to will the 75B barrel hold up to 9mm major loads. hmmm...
This barrel looks just the ticket, but of course it is out of stock...https://czcustom.com/cz-parts-all/barrels-complete-upper/cz-75-barrel-threaded-full-fact.html
Wondering if the SP-01 barrel could be fitted to the 75B frame if used with a SP-01 barrel bushing like this one: https://cajungunworks.com/product/barrel-bushing-for-sp-01-10x/
or if the current bushing can be honed out 5 thou. Luckily for me I just installed the 10x bushing last year. hmmm...

[Earl Keese]

Annnd... looking at the barrel differences between the 75B and SP-01 - the barrel diameters are different - the 75B has an OD of 0.50" and all the SP-01 and TS barrels are 0.55" OD. So... again the question now goes back to will the 75B barrel hold up to 9mm major loads. hmmm...
This barrel looks just the ticket, but of course it is out of stock...https://czcustom.com/cz-parts-all/barrels-complete-upper/cz-75-barrel-threaded-full-fact.html
Wondering if the SP-01 barrel could be fitted to the 75B frame if used with a SP-01 barrel bushing like this one: https://cajungunworks.com/product/barrel-bushing-for-sp-01-10x/
or if the current bushing can be honed out 5 thou. Luckily for me I just installed the 10x bushing last year. hmmm...

SP-01 barrel can't be fitted to a std 75 slide, its 50 thousandths bigger in diameter.

[eastman]

The 9mm barrels for the SP-01 are sized the same OD as the .40cal barrels (so a 9mm SP-01 barrel drops into a .40 slide just fine)

[newageroman]

Can the 75 SP-01 threaded barrel fit in the standard 75B 9mm slide if I swap out the barrel bushing for the one that fits the 01? Would the barrel lockup be different and require major fitting? If it will work without major barrel fitting, I might try it.

Other current option is to just get the 75 6" barrel and have it cut threaded locally for comp. If I go this way wondering if just threading the end would be beneficial (6 " barrel plus comp), or have the barrel cut so the comp sits flush with the slide. - Are there major benefits to using the longer barrel? If it will help make power factor I might try it.

EDIT-------------
Just called CZ custom, closed. called CGW and they said yes, standard 75B threaded barrel would be best. They are out of stock, CZ custom is out of stock. Other option is  just getting the longer barrel and cutting/threaded it, which could be a spendy gunsmith bill due to the hard steel barrels. So, this project is sidelined for now. Will repost if it happens.

[newageroman]

Ok, so this project will start back up soon(ish) hopefully.
Sold the SP-01 so that build is out. Still have the S2 and the 75B limited gun. I still might sell the S2 depending if/when I actually get to shoot the thing. While putting new grips on the S2 I did noticed that the old 75B is lighter. I'm wondering how much the ext barrel and comp will add.

At this stage I just want to get the ext barrel in the 75B and get it threaded and get the comp on:

Any advisement on tap and die set, or anything else I'm missing on this parts list. I see the adjustable ones allow tighter mating of the comp and will probably go that route. I have a cheap HF set, but I don't trust it for the CZ stuff.
9mm thread starter bore guide
adj tap and die set - 1/2 x 28 (is that the CZ standard)
75B barrel

[newageroman]

How much leade (ream the chamber) is normally done for PD 124 9mm maj? I'm about to order threaded barrel from CGW and gonna see if they ream them too.

SP-01 major gun - Phase I conversion is finished - Added a couple of parts I had to the SP-01 this weekend. S2 mag release and a 85 combat trigger (I think - actually it is a trigger off an old 75B). While the trigger was out I did break the right edge on the shoe a bit. Mainly to see if anyone else notices while shooting it. The S2 mag release was a definite upgrade. I didn't think it would make so much of a difference. It even has a small divot in the surface that just fits (I swear I would think it was flat just by looking at it). The only thing I didn't like about dropping mags is that they stuck in the grip (I forgot they had a mag brake - got to get on that fix...)

I also have a mid sized safety for the S2 that I was going to drop in, but I think I'll wait on that. I might try it, but I really did like the minimal safety on the stock S2. I kinda think that I'd like either having the minimal version or the full ramped extended version, the stock 01 safety is OK, so it's staying in for now.

I must say I'm pretty impressed with the trigger so far. PO added the Mcarbo spring kit. Da is nice, SA is pretty good. There is still some preload and then the FP spring - 2 noticeable differences in spring pressure, but it really is very good. In SA I have a hard time staging the trigger, with the old stock 01 trigger, I could easily stage the trigger in SA.

Grips and magwells on the say - stay tuned for that!

[M1A4ME]

An SP01 barrel is larger in OD?  Where?  At the muzzle?

If so, can you remove the CZ75 barrel bushing, install an SP01 bushing from CGW and have it work in the CZ75B slide?

It's been on the forum in other threads.  Check out this site with some "up there" 9MM velocities with slower burning powders.

http://www.natoreloading.com/

Seems like slower burning powders might work better with a compensator, too.  Think, Dragon's Breath!

[eastman]

An SP01 barrel is larger in OD?  Where?  At the muzzle?

If so, can you remove the CZ75 barrel bushing, install an SP01 bushing from CGW and have it work in the CZ75B slide?

It's been on the forum in other threads.  Check out this site with some "up there" 9MM velocities with slower burning powders.

http://www.natoreloading.com/

Seems like slower burning powders might work better with a compensator, too.  Think, Dragon's Breath!

SP-01 barrels are the same OD in both 9x19 and .40 S&W (0.550"), but CZ75 9mm barrels are smaller OD than the .40s.