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MCARBO FN 509 Trigger Spring Kit on a FN

AI illustration of a similar part on the gun.

FN · Trigger

MCARBO FN 509 Trigger Spring Kit

$20

Build with this part

Opens the builder with this part fitted. Other parts change only if they have to.

Specs

Fits	FN 509 Tactical

Pros and cons

Pros

About 40% lighter pull
Four replacement springs
Very low cost

Cons

Results vary by up to 1 lb
Not tested with Apex parts

Other trigger options