Cylinder & Slide
Rock Island Armory ROCK Ultra FS
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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.
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Model details
Manufacturer
Rock Island Armory
Model & version
ROCK Ultra FS
Mounting details
Not recorded
Compatibility records
50
Triggers & internals
Barrels & comps
Barrels
19 listed- Ed Brown
Barrels — Government, 45 ACP, standard feedramp
Manufacturer documented - Jarvis, Inc.
Jarvis 1911 Barrel — Government 5" 10mm
Manufacturer documented - Kart Precision
Gunsmith Fit Barrel
Manufacturer documented - Nowlin
Barrel, Gunsmith, Non-Ramped
Part no. SBPGManufacturer documented
Grip & magwells
Magazines
6 listed- Mec-Gar
1911 Full Size .40 S&W 8-Round Magazine
Manufacturer documented - Mec-Gar
1911 Full Size .45 ACP 10-Round Magazine
Part no. MGCG4510AManufacturer documented - Mec-Gar
1911 Full Size .45 ACP 7-Round Magazine
Part no. MGCG4507BManufacturer documented - Mec-Gar
1911 Full Size .45 ACP 8-Round Magazine
Part no. MGCG4508BPFManufacturer documented
Slides
Slides
4 listed- Advantage Arms
22LR Conversion Kit — 1911 Mini CA
Manufacturer documented - Advantage Arms
22LR Conversion Kit — 1911 Mini Threaded
Manufacturer documented - Advantage Arms
22LR Conversion Kit — 1911 Standard
Manufacturer documented - Advantage Arms
22LR Conversion Kit — 1911 Target
Manufacturer documented
Categories with no listings (14)
About the Rock Island Armory ROCK Ultra FS
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
- ROCK Ultra FS
- Mounting details
- Not recorded
- Width
- 1.3"
- Height
- 5.51"
- Weight
- 40 oz
- Barrel length
- 5"
- Overall length
- 8.74"