Burris
Rock Island Armory STK100 Ultra
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What the compatibility labels mean
How we knowHow we check compatibility
- Lab testedFit checked by Firearm Lab for the recorded setup.
- Documented fitmentSupported by manufacturer, partner, or reviewed community evidence.
- Interface matchMounting details match, but this exact model and part have not been confirmed to fit together.
Check your exact model and part before ordering. Fitment limits
Model details
Manufacturer
Rock Island Armory
Model & version
STK100 Ultra
Mounting details
Trijicon RMR, Shield RMSc
Compatibility records
119
Optics & footprint adapters
Optics
115 listed- Bushnell
RXC-200 Compact Reflex Sight
Interface match - C&H Precision
COMP Max Red Dot Optic
Interface match - Crimson Trace
RAD Micro PRO Red Dot Sight - 3 MOA
Interface match
Optic Plates
4 listed- C&H Precision
RMR to Aimpoint ACRO / C&H DUTY / DUTY-XL (Steel)
Interface match - C&H Precision
RMR to Holosun 407K / 507K & C&H EDC / EDC Enclosed / Olight Osight S
Interface match - C&H Precision
RMR to Holosun 509T STEEL
Interface match - C&H Precision
RMR to Holosun EPS / EPS Carry / SCS Carry
Interface match
Categories with no listings (16)
About the Rock Island Armory STK100 Ultra
Listed on the manufacturer catalogue (read 2026-08-04): https://www.armscor.com/full-size-pistols (+mid-size, +compact)
- Type
- Pistol
- Manufacturer
- Rock Island Armory
- Model & version
- STK100 Ultra
- Caliber
- 9mm
- Mounting details
- Trijicon RMR, Shield RMSc
- Width
- 1.36"
- Height
- 5.33"
- Weight
- 29.6 oz
- Barrel length
- 4.49"
- Manufacturer item #
- 57195
- Overall length
- 7.79"