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Work order — CZ Scorpion EVO 3 S1

Taking the firearm apart for a job such as refinishing, and putting it back together to specification. Generated from the Pew-Takedown entry last updated 2026-10-29. Confidence: high.

Shop difficulty: Tier 2 of 3

There are 88 line items (98 pieces), with 14 springs and 15 pins in a hammer-fired trigger group housed in a polymer lower. CZ stops the owner at the field strip. The fire control and stock hinge parts go in order, with no timing or special tool. 88 parts (Scorpion EVO 3 S list (all versions, English section)). Pew-Takedown's rating, not the manufacturer's.

Bench time: strip ~45 min, rebuild ~70 min (estimate). Actual: strip ______ rebuild ______

Special tools:

• Pin punches (polymer-safe, with a bench block) — Trigger group and stock pins
• Sight tool — Rear drum sight (only if moved)

Watch for:

• CZ tells the owner not to strip further than the field strip and to leave repair to a gunsmith. (both; Česká zbrojovka a.s. Uherský Brod)
• Parts and springs can be ejected during the strip; the cocking handle is held by a spring under the hand guard pin. (both; Česká zbrojovka a.s. Uherský Brod)
• The fire control group has many small springs (hammer, hammer catch, trigger, striking mechanism, slide release) to place correctly in the polymer lower. (reassembly; Česká zbrojovka a.s. Uherský Brod)

1. Clear and make safe

1. Point the muzzle in a safe direction and keep your finger off the trigger.
2. Place the selector or safety on safe.
3. Press or operate the magazine release and remove the magazine.
4. Pull the charging handle fully to the rear and lock the bolt open if the design allows.
5. Inspect the chamber and magazine well with a light and physically confirm the chamber is empty.
   Warning: Look and feel. Both, every time.
6. Remove all live ammunition from the work area.

2. Disassemble

Field Strip

1. Complete the Clear and Make Safe procedure and remove the magazine.
2. Unfold the shoulder stock or brace, if fitted.
   Tip: You need the room behind the receiver to draw the trigger unit back.
3. Set the fire mode lever to the fire position.
   Warning: Confirm the chamber is empty before moving the selector off safe.
4. Draw the slide fully rearward with the cocking handle and retain it by pushing the handle upwards. The slide is now locked in the rear position.
5. Grip the pistol grip tightly in one hand. With the thumb of the other, push on the front part of the trigger unit and press the outer part of the disassembly pin. Draw the pin out of the other side to its outermost position.
   Tip: The pin does not come all the way out — it stops at its outermost position.
6. Grasp the trigger unit case at the magazine housing and remove it by pulling backward and downward.
7. Move the slide slightly rearward with your thumb and pull it downwards. The slide comes out together with the recoil spring.
   Warning: Keep control of the recoil spring.
8. Stop here. The manual states no further disassembly is needed for routine maintenance, and warns to watch that no part or spring is ejected or lost during stripping.

3. Refinish

The components the procedures above separate. Coating, masking and cure are outside this database; follow your coating system's instructions. A part the manufacturer marks "factory fit" should not be swapped or reworked.

No manufacturer statement of materials or finish is recorded. Identify each part's material before choosing prep and cure.

The manufacturer's full parts list (88 parts) is on the reference page.

4. Reassemble

Reassembly

1. Fit the slide and recoil spring back into the receiver, pushing up and then slightly forward into their rails.
2. Bring the trigger unit up to the receiver from below and forward, seating it at the magazine housing.
3. Press the disassembly pin back through until it is flush.
4. Return the fire mode lever to safe.
5. Cycle the action several times with the cocking handle and perform the function check.

5. Torque

No manufacturer torque values are recorded for this firearm.

Notes: The manufacturer's documents give no torque value. They say: "When installing a non-folding shoulder stock of the AR type, it is necessary to fix the tube position by two locking screws and then tighten the tube nut to 45 N ± 10 %." (CZ Scorpion EVO 3 S1 Instruction Manual, PDF p. 9 ("Removing the shoulder stock")) "The pistol grip can be moved forwards or backwards by loosening the grip screw. After the pistol grip is adjusted the screw must be secured." (CZ Scorpion EVO 3 S1 Instruction Manual, PDF p. 9)

Fit or check on rebuild

• Function check — Hammer catch, disconnect and safety checked after the fire control goes back
• Zero — Sights/optics re-zeroed

6. Function check

• Verify the firearm is unloaded with no magazine inserted before each step.
• Cycle the action by hand and confirm the bolt returns fully into battery.
• With the safety on, press the trigger. The hammer or striker must not release.
• Move the safety to fire, cycle the action, and press the trigger. It should release.
• Hold the trigger back, cycle the action, and release slowly to feel the disconnector reset.
• Confirm the magazine seats and locks positively and releases cleanly.
• Confirm both receiver pins are fully seated.

If any check fails, the firearm is not safe to fire. Stop and see a licensed gunsmith.

Sources

1. CZ Scorpion EVO 3 S1 Instruction Manual — Česká zbrojovka a.s. Uherský Brod primary
   https://czubstrapiwebsitestorage.blob.core.windows.net/strapi-global/assets/735342000167_cz_scorpion_evo_3_s_en_es_cs_de_fr_11_2024_0abea205a5.pdf

Educational guide only. Some information comes from non-authoritative sources. Always consult your manufacturer's manual and a licensed gunsmith. Verify your firearm is unloaded before every procedure. Full disclaimer: https://github.com/Fundamental-build-LLC/Pew-Takedown

Legal notice: this material is third-party information compiled from sources of varying reliability and is provided for general informational and educational purposes only. It is not gunsmithing, technical, safety or legal advice, it is not verified or endorsed by any manufacturer, and it must not be taken as fact. Any work on a firearm beyond the routine field stripping described in its own owner's manual should be performed only by a licensed and insured gunsmith. You use this material entirely at your own risk. Fundamental Build LLC and the project's contributors make no warranty of any kind and accept no liability for death, injury, damage or loss arising from its use. Full terms: LEGAL.md.