Author Topic: Christmas SP-01 Tactical Trigger Job  (Read 2081 times)

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Offline PappaWheelie

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Christmas SP-01 Tactical Trigger Job
« on: December 27, 2017, 11:32:35 PM »
To go with PeachBoy son's new CZ SP-01 Tactical for Christmas, Santa stopped by Cajun Gun Works via the internet and put together the stuff he'd need for his first CZ trigger job, namely the $13 TR-PIN Floating Trigger Pin, the $35 5 Thick Trigger, the $72 SRS-2 Short Reset System and the $7 RP-TRS Reduced Power Trigger Return Spring, as I've ordered twice before with stellar results: see
http://www.czforum.com/forum/index.php?topic=4798.msg20513#msg20513
and
http://www.czforum.com/forum/index.php?topic=5057.msg21330#msg21330

He had already installed the Sig Short Reset kit on his P226 and has the requisite can-do spirit for the task; my being here in Hotlanta for Christmas to coach him through the process was gravy, given the excellent Tutorial for Decocker link on CGW?s website. I'd brought my original marked printout of same for his convenience.

The process took maybe 4 hours, including the 2mm raising of the hammer spring shoulder on the hammer spring strut, as a now-proven safe (via my RAMI, reference 1st link above) modification that sort of splits the (preload) difference between the black "range only" hammer spring supplied with the SRS-2 kit and the ~4mm longer "personal defense" blue spring.

We took "before" data on the trigger pull forces, averaging 10 readings in each case, at both mid trigger and trigger tip (the latter providing more consistent readings due to stability of geometry), for both Double Action ("DA") and Single Action ("SA") modes.

This particular specimen SP-01 had a notably gritty trigger, explained upon disassembly by the typically(?) imperfect hammer tooth broach finish, the burr on the bottom edge of the sear, and the perfectly horrible flatness (see both images), using the term very loosely, of the sear lever-engaging flat of the trigger bar.

We opted for the shortcut swapout of the firing pin block lifter lever (rather than complete disassembly of the sear cage assembly) as outlined in the 2nd link above, in that the sear's hammer tooth engagement face burr was easily removed without disassembly by minimal touchup with 600 grit wet-or-dry sandpaper, backed by a ~7mm wide blade comprised by a reprofiled (to rectangular) box cutter blade.

The tool that worked best for dressing down the very well-hardened, very ugly-textured trigger bar pusher surface turned out to be the flat tip face of a large "minus" (i.e., non-Phillips) screwdriver bit to back up the oft-refreshed 600 grit paper.

The hammer tooth took very little dressing, using the blade-backed wet-or-dry described in the 1st link above, with 600 grit to nearly remove the low spots and then 2000 grit to apply the final polish. Upon reassembly the transformation was amazing, showing full go-back-home stability at every point short of full break even before application of any lube!

The SP-01 Tactical came with the same kind of soft rolled sheetmetal firing pin retaining pin that I encountered with my RAMI BD.  It was well on its way to the firing pin lockup level of deformation with only a few nights practice with a laser bullet and the oh-so-cool free iTarget Pro cellphone app that "prints" The Andrew Klavan Show style bulletholes on the image of the target it's watching, everywhere it sees a laser dot. After downloading and installing (skip the credit card part), ignore the PURCHASE button and just click on the upper part of the screen to launch.

Doing one's own trigger job is incredibly satisfying: given patience with oneself and the excellent online Tutorial for Decocker there's no way to lose!

Sear Deburred
https://drive.google.com/open?id=1gOnA_7YgJdXuk3Yd3gc8RrH7mSGJGhqF
Hammer Tooth After
https://drive.google.com/open?id=11cldNHcFYF_dCYUAHYEkAUvfyZZgRlSn
Trigger Bar Before
https://drive.google.com/open?id=1qxoL-Al8KGIkr24xnRinGD9o2Zc9UscP
Trigger Bar Before2
https://drive.google.com/open?id=1P8yhJhNnZ6pdzblixEEtsKLPdNS5vjoM
Trigger Bar After
https://drive.google.com/open?id=10wVNzqdFORI4ajoZcvQ3soo-5Ka2PnH5
SP-01 Firing Pin Retaining Pin
https://drive.google.com/open?id=1fq1qNVO7_uebtJRmr5WF85mqLzrEeZsA

Before-After Comparisons, and Mid-Trigger vs. Trigger Tip Measurement Comparisons:

Mid Trigger Roller Pull Forces, (lbf):
DA Before Trigger Job 13.44
SA Before Trigger Job 5.54
DA After Trigger Job 8.73
SA After Trigger Job 3.74
 
Trigger Tip Pull Forces, (lbf):
DA Before Trigger Job 8.59
SA Before Trigger Job 3.77
DA After Trigger Job 5.30
SA After Trigger Job 2.71
 
DA Trigger Pull Reduction via Trigger Job, Mid Trigger Roller Measurement: 35.04%
SA Trigger Pull Reduction via Trigger Job, Mid Trigger Roller Measurement:  32.46%
DA Trigger Pull Reduction via Trigger Job, Trigger Tip Measurement: 38.31%
SA Trigger Pull Reduction via Trigger Job, Trigger Tip Measurement:  28.10%
 
DA Trigger Tip pull force 64% of Mid Trigger Roller pull force Before Trigger Job
DA Trigger Tip pull force 61% of Mid Trigger Roller pull force After Trigger Job
SA Trigger Tip pull force 68% of Mid Trigger Roller pull force Before Trigger Job
SA Trigger Tip pull force 72% of Mid Trigger Roller pull force After Trigger Job
 
« Last Edit: August 14, 2019, 09:41:40 PM by PappaWheelie, Reason: Restoration of quote marks where ? had been swapped »
Member, Gun Owners of America
CC: CZ 2075 RAMI BD in PappaWheelie Invisible 15 Round RAMI Holster
Homeboy: CZ 97 BD, Underwood 45 Super 120 Grain Xtreme Defender ammo
UBG: CZ 75 SP-01 Tactical Urban Grey Suppressor-ready
-all w/ CGW Short Reset Kit/1485-T2 Disco, 5 "Thick" Trigger, polished SA tooth

Offline PappaWheelie

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Re: Christmas SP-01 Tactical Trigger Job
« Reply #1 on: December 28, 2017, 04:30:39 PM »
Oh, and by the way the thing shoots pretty straight, and PeachBoy loves it; next day we went to the range. First Magazine Results (15'):

2 Rounds Hole 26Dec17
https://drive.google.com/open?id=1K10_HzoOwPAd9l0EIammNqXkvGWZbcJv

18 Rounds Hole 26Dec17
https://drive.google.com/open?id=1F55bclcuIoEzLneFmBOjqffhm2YZ1BN-

It appears the kid got his grandpa Jerry's sniper genes, as did Wifey; me not so much, although once in a while I get surprised...
https://imageshack.com/i/pnwR8Fwfj


Best Concealed Carry Rig?  http://www.czfirearms.us/index.php?topic=81829.msg600234#msg600234

« Last Edit: August 14, 2019, 09:44:52 PM by PappaWheelie, Reason: swapping out question marks for original quote marks »
Member, Gun Owners of America
CC: CZ 2075 RAMI BD in PappaWheelie Invisible 15 Round RAMI Holster
Homeboy: CZ 97 BD, Underwood 45 Super 120 Grain Xtreme Defender ammo
UBG: CZ 75 SP-01 Tactical Urban Grey Suppressor-ready
-all w/ CGW Short Reset Kit/1485-T2 Disco, 5 "Thick" Trigger, polished SA tooth

 

anything