SIG SAUER MOSQUITO - Manual (Page 21)

Maintenance
20 US 06.01
9.4 Functional check
Note:
The check of all functions must be made on the
assembled pistol:
• to determine any causes of malfunctioning,
• after completion of repairs,
• and after each cleaning and assembly of the
pistol.
Procedure:
1. Ensure the magazine is removed and pistol is
unloaded (see sections 6.7 and 6.8).
2. Check spring tension of the recoil spring and
slide cycling (no binding).
– Retract slide fully and release.
– Verify slide closes rapidly and fully under
spring tension.
– Repeat check again.
3. Check double action (DA).
– Insert empty magazine (gun has a
magazine safety).
– Pull trigger fully with decocked hammer.
– Verify hammer travels fully to rear and
releases. Hammer should impact firing pin
with adequate force. Hammer should reset
into safety intercept notch (verify by
pressing back of hammer).
4. Check trigger path and trigger interruption.
– Insert empty magazine (gun has a
magazine safety).
– Pull trigger fully to rear and hold.
– Retract slide fully and release.
– Verify hammer remains cocked to rear;
release trigger
5. Check single action trigger function (SA).
– Insert empty magazine (gun has a
magazine safety).
– Pull trigger fully
– Hammer should fall & impact firing pin with
adequate force. Hammer should reset into
safety intercept notch.
6. Check decocking lever and hammer safety
intercept notch.
– Remove magazine
– Cock hammer by retracting slide fully and
releasing.
– Depress decocking lever to lower hammer.
– Verify hammer is locked in safety intercept
notch by pushing back of hammer.
7. Check slide catch lever.
– Insert empty magazine; retract slide fully
and release
– Check that the slide remains locked to the
rear.
– Depress slide catch lever.
– Verify slide closes fully and with adequate
force.
– Depress decocking lever. Remove
magazine.
8. Check magazine.
– Inspect the magazine tube (lips and
floorplate) for signs of damage or dirt.
– Verify that magazine floorplate is properly
secured.
– Verify the feeder is under sufficient spring
tension and is not binding during
movement.
– Insert the magazine into the pistol
magazine well and ensure there is no
binding.
– Ensure the magazine catch does not bind
when depressed and released.
9. Check external condition of the pistol.
– Inspect front sight, rear sight, grip plates
and takedown lever for damage and dirt.
– Verify tightness of sights and grip plates.