SHS Cut-Off Lever — M4, Version 2 Gearbox
SHS Cut-Off Lever — M4, Version 2 Gearbox
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DETAILS
DETAILS
- description
Semi-auto is not electronic on a standard AEG. It is this lever, catching the tail of the sector gear and breaking the circuit once a single cycle has finished.
When the lever wears, rounds double up on semi or the gun runs on after the trigger is released. Neither fault is a trigger problem, though both tend to get blamed on one.
It is a small steel part doing a mechanical job several thousand times over a game day, which makes it a consumable rather than a lifetime fitting.
Specifications
| Specification | Detail |
|---|---|
| Part | Cut-off lever |
| Gearbox | Version 2 |
| Platform | M4 pattern |
| Manufacturer | SHS |
| Sold as | Single lever |
Good to know before you buy
A cut-off lever works alongside the selector plate and its own return spring. Where the lever is worn the spring usually is too, and changing one without checking the other is a false economy.
Frequently asked questions
What does a cut-off lever actually do?
It interrupts the trigger circuit once the sector gear has come round, which is what turns a continuous mechanism into a single shot.
Why is my gun firing two rounds on semi?
Doubling is the classic worn lever symptom, though a tired contact set or a weak return spring will do the same thing.
Does this matter if I run a MOSFET?
Many electronic units take fire control over completely, in which case the lever matters less. On a mechanical build it is doing the entire job.