light strikes FTF- odyssey of a kadet

[joerchi69]

Light stress marks on one hammer side. Could not feel any rubbing when attending the hammer down by thumb. So i concentrate on the other issues to add power to the strike.

[joerchi69]

It's somewhat puzzling why this kit is being so stubborn. Mine will run 100% with CCI SV, or Geco, for roughly 300 rounds and then need the feed ramp/breech face cleaned. All this with a 15 lb hammer spring.

That is exactly what i like to reach, too   

[joerchi69]

WRT the reshaping...remove material on the opposite side that's already beveled. You want the strike about .010-.015 inside the edge of the case,. Keep in mind that all ammo has variances, so be conservative. The idea is to not waste energy on crushing the outside of the rim.

The original FP i had modified (input from the forum) to turn it 180 degrees but trying it out it for a short time showed a much worse ignition rate. But i believe it was just to much away from the rim or something else did not work. Maybe the FP was bent. Regret having no pics of the dents in the brass to show.


Because of your post i found that telling site:
You can clearly see if you are hitting way out on the rim, you are hitting folded brass, diminishing the power of the strike.This is what target shooters do to their firing pins to get more reliable ignition:

https://www.rimfirecentral.com/forums/showthread.php?t=1059114

https://www.rimfirecentral.com/forums/showthread.php?t=545484

 A wide variety of 22 ammunition sectioned , photographed, and shared.

[joerchi69]

Amused myself with practice shooting this rainy sunday gunday. 350 shots of three types of ammo. CCI sv i know pretty much. The other two where new to me. Let the first paper target hang until the end of the session. Just added a new one on top of it, from time to time, for better hit identification.
150 CCI Standard, the first 100 just 5 slide issues, no round delivered or stayed not open on the last rd (1). Probably just the spacer- reinforced 20 lbs hammerspring beeing to strong for some CCI standard velocity. The 2 light strikes came in the shots 100 to 150. Checked the drop in of a live round in the chamber. Not free falling like when freshly cleaned. So i scrubbed it. Ammo droped in like magnetic again.
100 shots of CCI Slect followed flawless into the black hole where the ammo gets lost. Imaging myself a better accuracy than other ammo.
100 shots of CCI Mag followed without cleaning but with just one ftfire, around no. 170.

350 shots 25 meters two handed

[joerchi69]

Rimpressions of the above mentioned 350 shots. FP2 modified to avoid the massive brass area of the rim. Could move a very little more away and to the inside ?

Dents top down.
CCI sv            0-50     4 slide errors= ftfeed
CCI sv          51-100    1 slide error
CCI sv        101-150    1 slide, 2 ftfire
CCI Select   151-250    as it should be (cleaned chamber and breech face beforehand)
CCI MiniMag 251-350    1ftfire

Target-setting will be now, to get rid of the "stop and go" - rattling down hammer. It is prior to fixing that. Than testing the original FP with a free moving hammer and different ammo. Then maybe testing modified FPs again.

[joerchi69]

Luckily this was an easy to fix one. My local gunsmith kindly showed me the cause-and-effect chain. Because i adjusted my (self installed SA) trigger set screw in a too tight way, the movement of the trigger was to little for its entire task : To lift the sear enough to get it completely over - and out of the way of the second (half cock) notch. He just opened the little hex grub screw about one to two turns. And the hammer is freely moving down. Will see if this nullify the ftfire with the .22 ammo.



The hammer (left) i took out some months later in july 2020. The toothpick is pointing on the half cock notch / disassembly notch. Right: Tactical Sports hammer to compare size and wight.


Damage can be seen where the sear rattled over the second notch and took away some hammer force on the way to the firing pin.








Adustment of the over travel screw due to that description :

https://czcustom.com/knowledge-base/general/how-do-i-adjust-the-over-travel-screw-on-cz-pistols.html

 

[DenStinett]

How great would it be if that was actually it all-along
Great learning experience though

[joerchi69]

How great would it be if that was actually it all-along
Great learning experience though

Would be a great release. And proofing my reckless stupidity how to set challenges to learn from. 
I`am just not sure with the course of changes. Was there the installing and missadjusting of the SA trigger causing the ftfire ? Or did i had the .22lr light strikes before shifting to that useful graded up piece of aluminum.
Looking forward to find out by substantial shooting..

[joerchi69]

Another item to check...make sure the roll pin that retains the barrel has not broken. That would allow the barrel to move forward when the case gets struck by the pin. If you want to get a replacement beforehand, the size is 3 x 12 mm.
Pay attention to the orientation of the split in the pin. It matters.

Hello Painter,
could you  have a look on my Kadets pin and be so kind to help me to understand in what way the orientation of the split matters ? In what orientation is it more durable maybe ? The split is on 6 o`clock downward to the barrel..


other side view

[joerchi69]

485 rounds in a row and no missfire. Happy!

Just one failiure to feed. For that i blame my 1,6mm = 0.0629inch spacer prestressing the 20lbs. hammerspring in combination with a little weak CCI sv and too short slide kick back travel, may be. No cleaning in between.
300 CCI select, 85 Blazer and 100 CCI sv ignited as desired. For sure what i like to hear. YYhaaa !

I hope it will stay like that in genearal. When i remove the added spacer. And in a second step i`ll try FP1 and FP3.

I-dent-ification pic (CCI select / FP2, 200 rds fired)

[joerchi69]

Todays others big relief was the premiere of using the - thank you - DenStinnet style modified uplula.
Filling the magazine is very quick and truly recreational now. To complete the gift pack, a shootings club member handed me down his 1950`s/1960`s estimated Anschütz single loader. Out of his uncles heritage who was a hunter like he is. Probably his uncles first rifle he told me. Like a wave through time it is my first rifle too.



To embellish that days positive vibration on a grand scale, another club member offered for free a Rossi Puma 92. With a bucket of brass .44 magnum for reloading. Just have to pay the dues to list it of their licences to mine.

https://czfirearms.us/index.php?topic=24310.0
 link mod uplula DenStinnet

[painter]

Another item to check...make sure the roll pin that retains the barrel has not broken. That would allow the barrel to move forward when the case gets struck by the pin. If you want to get a replacement beforehand, the size is 3 x 12 mm.
Pay attention to the orientation of the split in the pin. It matters.

Hello Painter,
could you  have a look on my Kadets pin and be so kind to help me to understand in what way the orientation of the split matters ? In what orientation is it more durable maybe ? The split is on 6 o`clock downward to the barrel..

6 or 12 is correct.

[joerchi69]

         Just to compare the dephts of FP strikes on different brass rimfires

left side with missfires, 350 rds                                 hammer free moving
Hammer was irritated by rattling over
the half cock notch                                             right side no missfires 485 rounds in a row
                                                                       
Dents top down.
CCI sv            0-50     4 slide errors= ftfeed                     CCI select   0   - 100
CCI sv          51-100    1 slide error                                 CCI select   101- 200
CCI sv        101-150    1 slide, 2 ftfire                              CCI select   201- 300
cleaned chamber and breech face                                    CCI Blazer    351-350               
CCI Select   151-250    as it should be                              then i went on with CCI sv and Blazer without sampling
CCI MiniMag 251-350    1ftfire




For me the right side`s dents on the brass are over all deeper. And the metal is bent more around the strike area. The right side fourth row Blazers
impacts all seem less deep than on all the select ones above.
All of the select and mini mag cases apperently have deeper impacts than in the Blazer or CCI sv rims.

same cases other angle

[painter]

I'd take just a touch more off that firing pin.

[joerchi69]

I'd take just a touch more off that firing pin.

Hello Painter, thank`s for amplyfying ! I ´will do so.
Also shot the kadet today, removed the spacer under the hammer spring (20 lbs) to see how reliable the ignition is. And in a first step consolidating findings for the lightest possible hammer spring with a optimized FP. Without the spacer but the 20lbs HS where some failiures. With the cheap ammo only. Next categoriy up ammo CCI select worked just fine.


Dents top down

Blazer    15 rds,  fine
CCI sv    50 rds  1 stove pipe, slide closed on last rd, oiled the slide rails more
CCI sv    50 rds  1 missfire, 3 times the slide closed on the last round
CCI sv    50 rds  3 rds not delivered out of mag , 2 slide closing last rd, cleaned it
CCI select100 rds, fine
CCI Blazer 50 rds, 1 missfire

last row 3 cases fired from range neighbor with a full pistol kadet with the old FP



Summary; Loading with the, thank you, DenStinnet - style modified uplula is a pleasure. Especially reminiscent to the two thumbs method before.
With the CCI SV 250 rds, 2 missfire, but (as usal) in the triple-digit, from 150 to 200 on, when cleaned in between the next pack without. Some slide issues with the CCI SV too, not delivering the next round, stayed not open. May be i can use a lower lbs hs to get the slide always cycling well and strip all rounds out of the mag every time ? If the strong 20 lbs HS is responsible for that..? When the wolff extra power springs arrive i will give them a try too.
For now i will go on without the HS spacer and modify the FP just a touch more. To have more impact power besides the solid rim.
For tournaments i will have ready the CCI select to avoid stress through uncalled malfunctions.