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Tokarev SVT-40

• moderate
• Shop tier 3
• medium confidence
• Rifle
• surplus
• short stroke piston
• adjustable gas
• tilting bolt
• historic
• corrosive ammo

field strip ~4 min · reassembly ~6 min · detail strip ~40 min

Specifications

Model-specific safety

• The SVT-40 has an ADJUSTABLE GAS SYSTEM with numbered settings. It must be set correctly for the ammunition and conditions. Set too high, the rifle batters itself and can damage the bolt and receiver; set too low it will not cycle. Wartime instructions were to use the lowest setting that cycles reliably.
• Do not fire the rifle with the gas plug removed or incorrectly installed.
• These rifles are 80 years old, were built in wartime conditions, and many are rebuilt with mixed parts. Have headspace checked before firing.
• Surplus 7.62x54mmR is frequently corrosively primed. Clean the bore, gas system, and bolt face with a water-based solvent the same day you shoot.
• The magazine is detachable but was intended to be charger-loaded in place. Verify the chamber independently of the magazine.

Under spring tension

• Recoil spring assembly
• Magazine spring
• Hammer spring

Easily lost parts

Gas plug and regulator sleeve · Bolt carrier components · Firing pin

Tools

No tools required for the field strip.

Shop difficulty

Shop tier 3 Tier 3 — hardest among rifles and carbines, for the full job: strip to the parts that get coated and put it back together working. A complex WWII gas rifle: detachable gas regulator and piston, a two-piece recoil spring that is held compressed while the second half goes in, an extractor plunger that is hard to depress, and a trigger group owners describe as very hard to click back in. Several tensioned parts plus reported misery put it at Tier 3.

Parts: 63 numbered parts (complete Tokarev SVT-38/SVT-40 self-loading rifle per the Gun Digest exploded drawing legend 'Tokarev Model 38 and 40' (courtesy of Blacksmith Corporation), keys 1-63: muzzle brake and gas regulator, ), from The Gun Digest Book of Exploded Gun Drawings (975 isometric views) — Tokarev 'Model 38 and 40 Bolt-Action Rifle' — Gun Digest Books / Krause Publications (scan on archive.org), p. book p. 899 (PDF page 900) archive.org [7].

Bench time: about 60 min to strip, 90 min to rebuild (estimate). Receiver cover, two-part recoil spring, carrier and bolt, gas regulator, piston and tube, trigger group, extractor, stock and muzzle brake.

Small parts: 5 pins, 13 springs, 4 detents or plungers (counted by name in the same legend (line items). Pins: 28 ejector pin, 33 trigger guard latch pin, 37 split cross pin, 56 magazine catch and sear pins, 57 trigger and trigger spring pins (18 firing pi)

What comes off for coating

• Receiver: receiver cover, recoil spring (two halves), bolt carrier and bolt, trigger group (latch plunger), magazine catch
• Gas system: gas plug / regulator, gas piston and spring, pusher rod
• Bolt: firing pin and pin, extractor, plunger, spring
• Stock / barrel: handguards, barrel bands, muzzle brake, sights

Special tools

• brass drift — Trigger-guard latch plunger
• rubber mallet / wood block — Seating the trigger group (owners' method)
• SVT regulator tool (cleaning kit) — Gas regulator

Known pain points

• The trigger group is very hard to snap back into the receiver and stock. Owners use a dowel and mallet or a hard palm strike. (reassembly)
  Owners report: SVT-40 trigger pack reassembly problem — Canadian Gun Nutz canadiangunnutz.com [3] — “Despite having the little gate at the rear of the receiver at the 9 o’clock position, it is very difficult for me to click the trigger pack into place.”
• The recoil spring is two springs on a telescoping rod. The inner half has to be held compressed by hand while the outer half is brought in. (both)
  Owners report: Mechanical Problems with SVT 40's? (page 3) — Canadian Gun Nutz canadiangunnutz.com [4] — “You use one hand to hold the inner half of the spring compressed while using the other to bring the second portion in.”
• The trigger-guard latch plunger often will not depress to release the group on first strip, especially with cosmoline. (disassembly)
  Owners report: Svt 40 noob question — Canadian Gun Nutz canadiangunnutz.com [5] — “The trigger group can be a pain to reinstall. I carved a groove in a piece of 2x4 the width of the trigger guard that I can double hand slam it with.”
• The extractor plunger in the bolt is hard to depress to free the extractor. (both)
  Owners report: SVT-40 Bolt Disassembly — Canadian Gun Nutz canadiangunnutz.com [6] — “For the extractor, if you look at the rear, there,s a slot, using a pointed tool, the extractor plunger is pushed back then the extractor can be removed.”

Fit or check on rebuild

• Gas regulator back to recorded setting — A wrong setting batters the rifle or stops it cycling.
• Function check (safety, trigger reset, feeding, extraction) — Standard after any detail strip. No single source.
• Re-zero sights or scope — Sights and optics come off for coating, and point of impact must be re-confirmed. This is a standard check, so no source.

This is Pew-Takedown's rating, not the manufacturer's. How tiers are rated. Forum reports are owners' experience, not specifications.

Procedures

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.

Function check

• Verify the rifle is unloaded with no magazine inserted before each step.
• Cycle the action by hand and confirm the bolt locks and returns fully to battery.
• With the selector on safe, press the trigger. The hammer must not fall.
• Move the selector to fire, cycle the action, and press the trigger. The hammer should fall.
• Hold the trigger back, cycle the action, and release slowly to feel the disconnector reset.
• Confirm the magazine seats and locks positively and any hold-open engages on an empty magazine.
• Confirm the receiver cover is latched and the gas plug is fully seated.
• Confirm the gas regulator is on a known setting before firing.

Maintenance

Lubrication points

• Bolt and carrier bearing surfaces
• Carrier rails
• Gas piston (light film)
• Hammer and sear pivots

Cleaning notes

Clean the gas system thoroughly — a fouled gas cylinder changes how the rifle is gassed and is the usual cause of a rifle that used to cycle and now does not. Surplus ammunition of this era is frequently corrosively primed. After shooting it, flush the bore, bolt face, and gas system with hot soapy water or a water-based solvent the same day, dry completely, then oil. Keep the firing pin channel clean and dry — a pin held forward by congealed cosmoline causes slam fires.

Suggested inspection interval: roughly every 500 rounds. This is a general guideline, not a manufacturer specification.

Wear parts to inspect

Gas piston and regulator · Bolt and locking surfaces · Extractor · Recoil spring · Magazine feed lips

Common issues

Also covers

The procedures above are reported to apply to: SVT-38 (earlier, with differences) · AVT-40 (select-fire variant). Verify against the manual for your specific model.

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• SKS
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Sourcing