Increase the capacity of your SHS STP12 Straightpull Shotgun with the Ignition Custom Engineering SHS magazine extension.
Options to increase by +2 additional shots or +5 additional shots.
No permanent modifications required to the shotgun.
Instructions provided (requires some disassembly of shotgun).
Ausralian made. Manufactured by the gunsmiths at our Adelaide workshop.
- Magazine Extension Tube +2 or +5 capacity (finished in hard wearing Cerakote)
- 10 Shot Magazine Spring (+5 kit only)
- Ultralite Barrel Clamp
- SHS Hex Magazine Nut
Which Kit Is Best For Me?
20" barrel SHS: we recommend using the +2 kit on a 20" barrel model as the extension will be roughly the same length as the barrel muzzle.
28" barrel SHS: You can use the +2 kit or the +5 Kit (the +5 extension will be roughly the same length as the barrel muzzle).