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CZ Scorpion EVO 3 S1
- easy
- Shop tier 2
- high confidence
- Pistol-Caliber Carbine
- blowback
- pistol caliber
- push pin receiver
- polymer receiver
field strip ~3 min · reassembly ~4 min · detail strip ~25 min
Specifications
- Manufacturer
- Česká zbrojovka (CZ)
- Origin
- Czech Republic
- Category
- Pistol-Caliber Carbine
- Action
- Blowback
- Calibers
- 9x19mm Parabellum
- Capacity
- 20 or 30 rounds
- Production
- 2009–present (in-production)
- Also known as
- Scorpion EVO 3, Scorpion Carbine
Model-specific safety
- The receiver separates on push pins like an AR. Both pins must be fully seated before firing.
- The recoil spring assembly is under compression when the upper is opened.
- The factory charging handle is reciprocating and sits on the left side by default. It moves during firing — keep your support hand clear of its path.
- This is a simple blowback in 9mm, which means the bolt is heavy and the action fouls quickly.
Under spring tension
- Recoil spring assembly
- Magazine spring
- Hammer spring
Easily lost parts
Push pins · Recoil spring assembly · Bolt components
Tools
No tools required for the field strip.
Shop difficulty
Shop tier 2 Tier 2 — moderate among rifles and carbines, for the full job: strip to the parts that get coated and put it back together working. 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.
Parts: 88 numbered parts (Scorpion EVO 3 S list (all versions, English section)), from CZ Scorpion EVO 3 S1 Instruction Manual — Česká zbrojovka a.s. Uherský Brod, p. 12 czubstrapiwebsitestorage.blob.core.windows.net [1].
Bench time: about 45 min to strip, 70 min to rebuild (estimate). Estimate: field strip (lower, bolt, recoil spring), fire control group out of the lower, handguard and cocking handle, sights, stock and hinge, mag catch, bolt strip. Rebuild longer for the trigger group springs.
Small parts: 16 pins, 16 springs, 0 detents or plungers (counted from the manufacturer's parts list (one per key number unless a quantity is given))
What comes off for coating
- Lower / fire control: hammer, hammer pin and spring, hammer catch and spring, trigger, trigger pins and spring, safety and plug, magazine catch, pin and spring, slide release and spring — pin punches
- Upper: bolt (striker, striker spring, extractor, pin and spring, striker block and spring), recoil spring and washer, hand guard, pin and cocking handle, sights, muzzle device
- Stock: stock, joint pin, positioner and spring, catch and spring, retaining button and spring
Special tools
- Pin punches (polymer-safe, with a bench block) — Trigger group and stock pins
- Sight tool — Rear drum sight (only if moved)
Known pain points
- CZ tells the owner not to strip further than the field strip and to leave repair to a gunsmith. (both)
Source: CZ Scorpion EVO 3 S1 Instruction Manual — Česká zbrojovka a.s. Uherský Brod czubstrapiwebsitestorage.blob.core.windows.net [1] — “Do not strip your firearm any further. If you assume that your firearm requires adjustment or repair, entrust this work to a competent gunsmith in a specialized workshop!” - Parts and springs can be ejected during the strip; the cocking handle is held by a spring under the hand guard pin. (both)
Source: CZ Scorpion EVO 3 S1 Instruction Manual — Česká zbrojovka a.s. Uherský Brod czubstrapiwebsitestorage.blob.core.windows.net [1] — “While stripping the gun make sure that no part or spring is ejected, lost or that it causes injuries.” - The fire control group has many small springs (hammer, hammer catch, trigger, striking mechanism, slide release) to place correctly in the polymer lower. (reassembly)
Source: CZ Scorpion EVO 3 S1 Instruction Manual — Česká zbrojovka a.s. Uherský Brod czubstrapiwebsitestorage.blob.core.windows.net [1] — “Hammer catch spring”
Fit or check on rebuild
- Function check — Hammer catch, disconnect and safety checked after the fire control goes back
- Zero — Sights/optics re-zeroed
This is Pew-Takedown's rating, not the manufacturer's. How tiers are rated. Forum reports are owners' experience, not specifications.
Manufacturer videos
Official videos from Česká zbrojovka (CZ)'s own channels, linked rather than copied. Where a video and the steps on this page differ, follow the manufacturer's manual and video.
- CZ Scorpion Tap/Rack with Mike Pannone czusafirearms
operation · 2017-03-13
Covers: CZ Scorpion EVO 3 (2017, pre-3+)
Procedures
Clear and Make Safe
Clear & Make Safe- Point the muzzle in a safe direction and keep your finger off the trigger.
- Place the selector or safety on safe.
- Press or operate the magazine release and remove the magazine.Removed at this step:
Magazine - Pull the charging handle fully to the rear and lock the bolt open if the design allows.
- Inspect the chamber and magazine well with a light and physically confirm the chamber is empty.WarningLook and feel. Both, every time.
- Remove all live ammunition from the work area.
Field Strip
Field Strip- Complete the Clear and Make Safe procedure and remove the magazine.
- Unfold the shoulder stock or brace, if fitted.TipYou need the room behind the receiver to draw the trigger unit back.
- Set the fire mode lever to the fire position.WarningConfirm the chamber is empty before moving the selector off safe.
- 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.
- 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.TipThe pin does not come all the way out — it stops at its outermost position.
- Grasp the trigger unit case at the magazine housing and remove it by pulling backward and downward.Removed at this step:
Trigger unit / lower - Move the slide slightly rearward with your thumb and pull it downwards. The slide comes out together with the recoil spring.WarningKeep control of the recoil spring.Removed at this step:
Slide (bolt carrier)Recoil spring - 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.
Reassembly
Reassembly- Fit the slide and recoil spring back into the receiver, pushing up and then slightly forward into their rails.
- Bring the trigger unit up to the receiver from below and forward, seating it at the magazine housing.
- Press the disassembly pin back through until it is flush.
- Return the fire mode lever to safe.
- Cycle the action several times with the cocking handle and perform the function check.
Torque specifications
No sourced torque values from the manufacturer are recorded for this firearm. Where a fastener has a specified torque — action screws, scope bases, muzzle devices, barrel nuts — get it from the manufacturer or a gunsmith rather than estimating it.
What the manufacturer does say: 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)
Parts list
Transcribed from the manufacturer's parts list (CZ Scorpion EVO 3 S1 Instruction Manual — Česká zbrojovka a.s. Uherský Brod, p. 12 czubstrapiwebsitestorage.blob.core.windows.net [1]) — Single Scorpion EVO 3 S list (English section) covering all versions in the manual (EVO 3 S1 pistol, S1 Carbine etc.); rows marked * vary by version or are absent. ES/CS/DE/FR copies omitted.. Key numbers refer to the exploded view in that document.
88 parts
| Key | Part | Part no. | Qty | Group |
|---|---|---|---|---|
| 1 | Compensator The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 2 | Barrel nut The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 3 | Barrel The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 4 | Compensator catch The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 5 | Ring The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 6 | Hand guard The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 7 | Hand guard pin The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 8 | Front swivel The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 2 | ||
| 9 | Receiver The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 10 | Tirant and fingerboard | 1 | ||
| 11 | Short receiver screw | 4 | ||
| 12 | Long receiver screw | 2 | ||
| 13 | Medium receiver screw | 1 | ||
| 14 | Pistol grip screw | 1 | ||
| 15 | Right fire mode lever | 1 | ||
| 16 | Magazine base The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 17 | Magazine base catch The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 18 | Follower The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 19 | Magazine body The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 20 | Magazine spring The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 21 | Striker spring | 1 | ||
| 22 | Joint The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 23 | Pistol grip | 1 | ||
| 24 | Locking pin | 2 | ||
| 25 | Front locking stud | 1 | ||
| 26 | Extractor pin | 1 | ||
| 27 | Extractor | 1 | ||
| 28 | Extractor spring | 1 | ||
| 29 | Extractor spring base | 1 | ||
| 30 | Slide | 1 | ||
| 31 | Striker block spring | 1 | ||
| 32 | Striker block | 1 | ||
| 33 | Striker | 1 | ||
| 34 | Guide stud | 1 | ||
| 35 | Recoil spring | 1 | ||
| 36 | Buffer | 1 | ||
| 37 | Recoil spring washer | 1 | ||
| 38 | Magazine catch pin | 1 | ||
| 39 | Magazine catch | 1 | ||
| 40 | Magazine catch spring | 1 | ||
| 41 | Disassembly pin | 1 | ||
| 42 | Trigger unit casing | 1 | ||
| 43 | Slide Release Spring | 1 | ||
| 44 | Slide Release | 1 | ||
| 45 | Ejector pin | 1 | ||
| 46 | Ejector | 1 | ||
| 47 | Trigger case | 1 | ||
| 48 | Case securing screw | 1 | ||
| 49 | Control screw | 2 | ||
| 50 | Striking mechanism spring | 1 | ||
| 51 | Left fire mode lever | 1 | ||
| 52 | Hammer pin | 1 | ||
| 53 | Hammer | 1 | ||
| 54 | Trigger pin | 1 | ||
| 55 | Block lever | 1 | ||
| 56 | Trigger housing | 1 | ||
| 57 | Trigger | 1 | ||
| 58 | Hammer spring | 1 | ||
| 59 | Disconnector | 1 | ||
| 60 | Safety plug | 1 | ||
| 61 | Safety pin plug | 1 | ||
| 62 | Trigger pin | 1 | ||
| 63 | Trigger insert | 1 | ||
| 64 | Hammer catch spring | 1 | ||
| 66 | Front sight The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 67 | Rear sight The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 68 | Trigger spring | 1 | ||
| 69 | Stock catch spring The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 70 | Stock tube The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 71 | Stock catch The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 72 | Joint pin The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 73 | Stock positioner pin The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 74 | Shoulder stock pin The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 75 | Shoulder stock The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 76 | Stock positioner The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 77 | Positioner spring The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 78 | Stock catch pin The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 80 | Stock retaining button spring | 1 | ||
| 81 | Stock retaining button | 1 | ||
| 82 | Flash hider The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 83 | Barrel shroud The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 84 | Spring hand guard pin The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 85 | Front hand stop The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 86 | Flange The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 87 | Flange screw The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 4 | ||
| 88 | Screw The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 89 | AR tube with nut The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 | ||
| 90 | AR shoulder stock The parts marked * differ in accordance with the differing versions, or, as may be the case in some versions, will be entirely missing | 1 |
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.
Maintenance
Lubrication points
- Bolt body where it rides in the receiver
- Recoil spring and guide
- Hammer and sear pivots
Cleaning notes
Pistol-caliber blowback actions foul heavily and quickly — far more than a locked-breech rifle, because the case begins moving while pressure is still high. Clean the bolt face and receiver interior regularly and keep lubrication moderate.
Suggested inspection interval: roughly every 1000 rounds. This is a general guideline, not a manufacturer specification.
Wear parts to inspect
Recoil spring · Extractor and spring · Bolt face · Magazine springs and feed lips
Common issues
| Symptom | Likely cause | What to do |
|---|---|---|
| Heavy fouling after a few hundred rounds | Simple blowback in 9mm fouls quickly by nature | Clean the bolt face and receiver interior regularly. This is expected, not a fault. |
| Charging handle striking the support hand | The factory handle reciprocates | Adjust hand position or fit a non-reciprocating handle. |
Also covers
The procedures above are reported to apply to: Scorpion EVO 3 S1 Pistol and Carbine · Scorpion EVO 3 S2. Verify against the manual for your specific model.
Similar manual of arms
Legal notes
Sourcing
- Confidence
- high — Cross-checked against a primary source such as the manufacturer's manual or an issuing military technical manual.
- Verification
- Checked against the manufacturer manual
- Last updated
- 2026-10-29
References
Every source this page draws on, with its web address so you can read it yourself. Numbers in brackets elsewhere on the page point here.
- [1] CZ Scorpion EVO 3 S1 Instruction Manual — Česká zbrojovka a.s. Uherský Brod manufacturer manual primary source
https://czubstrapiwebsitestorage.blob.core.windows.net/strapi-global/assets/735342000167_cz_scorpion_evo_3_s_en_es_cs_de_fr_11_2024_0abea205a5.pdf (checked 2026-09-14)
Notes: CORRECTED on 2026-09-14 against the factory manual. The previous entry described an AR-pattern front-and-rear takedown pin and a pivoting upper receiver. The Scorpion has neither. It uses a single disassembly pin, and the trigger unit comes off backward and downward before the slide is removed. Rated medium pending step-by-step confirmation of bolt disassembly against the factory manual. Receiver separation on push pins is well established.