UZI Conversion Kit 9 MM To .45 ACP
UZI Conversion Kit, 9mm to .45 ACP, Semi-Auto
So you want more caliber out of your full-size UZI without buying a whole new gun. This kit gets you there. A complete UZI .45 ACP semi-auto conversion kit, turning your 9mm full-size UZI into a hard-hitting .45 in under 60 seconds. Includes the .45 ACP barrel, IMI semi-auto bolt, and magazines. No FFL required for the kit itself.
UZI Conversion Kit 9 MM To .45 ACP This is a genuine caliber swap, not a gimmick. First, the conversion works by exchanging three components — the barrel, bolt, and magazine. Next, the IMI semi-auto Model B bolt uses tungsten inserts to add mass, which controls the blowback rate correctly for the heavier .45 cartridge. Finally, this kit ships with magazines so you’re ready to run it the same day.
Will this UZI Conversion Kit 9 MM To .45 ACP work on my UZI?
Yes, for full-size semi-auto models. So this kit fits the full-size UZI Model A and B, Century Arms UC-9, Vector Arms, Action Arms, Norinco, and Group Industries semi-auto UZIs. However, this is NOT compatible with the Mini UZI, Micro UZI, or any full-auto UZI. Therefore, confirm your specific model before ordering, since the full-size and mini/micro platforms use different receiver dimensions.
Does this UZI Conversion Kit 9 MM To .45 ACP require an FFL transfer?
No. So this is a conversion kit — barrel, bolt, and magazines — with no serialized receiver included. Therefore, it ships directly and does not require an FFL transfer. However, always verify your specific state and local laws regarding caliber conversion kits and .45 ACP magazine capacity before purchasing.
How fast can I actually swap calibers?
UZI Conversion Kit 9 MM To .45 ACP Under 60 seconds, in the field. So the process is simply: remove the cover, pull the bolt, unscrew the barrel, and install the .45 ACP bolt and barrel. Also, swap the magazine and reinstall the cover. Therefore, this is a genuine quick-change system, not a complex gunsmithing procedure. The whole swap requires no tools.
What capacity do the .45 ACP magazines hold?
UZI Conversion Kit 9 MM To .45 ACP 16 rounds in the standard configuration, less than the 9mm. So the .45 ACP cartridge is significantly larger in diameter than 9mm, reducing how many rounds fit in the same-size magazine body. Also, this is normal for .45 UZI conversions — confirmed from Action Arms’ original testing documentation when this kit was first introduced. Therefore, expect a capacity trade-off when running the .45 conversion compared to your standard 9mm magazines.
Why does the bolt use tungsten inserts?
UZI Conversion Kit 9 MM To .45 ACP To control the cycling rate correctly for .45 ACP. So blowback-operated firearms cycle faster with lighter bolts. Also, the .45 ACP cartridge is heavier and slower than 9mm, and the original UZI bolt mass would result in too-fast cycling without modification. Therefore, IMI used tungsten inserts — roughly twice as dense as steel — to add mass to the bolt without dramatically changing its size, keeping the cyclic rate appropriate for the .45 ACP cartridge.
Specs Table
| Spec | Detail |
|---|---|
| Compatibility | Full-size semi-auto UZI: Model A, Model B, Century UC-9, Vector, Action Arms, Norinco, Group Industries |
| NOT Compatible With | Mini UZI, Micro UZI, full-auto UZI models |
| Caliber Conversion | 9mm Luger → .45 ACP |
| Barrel Length | 16″ (semi-auto legal length) |
| Includes | .45 ACP barrel, IMI semi-auto Model B bolt with tungsten inserts, magazines |
| Magazine Capacity | 16 rounds (standard .45 ACP UZI magazine) |
| FFL Required | No — kit does not include a serialized receiver |
| Swap Time | Under 60 seconds, no tools required |
| Bolt Design | IMI semi-auto Model B, tungsten inserts for correct cyclic rate |
| Best For | Full-size UZI owners wanting .45 ACP capability |
| Weight | verify |
| Price | $1850 |
| Condition | verify (new or unfired per specific listing) |
FAQ
Will this UZI Conversion Kit 9 MM To .45 ACP fit a Mini UZI? No. This kit is specifically for full-size semi-auto UZI models only. Mini and Micro UZI platforms are not compatible.
Do I need an FFL to purchase this conversion kit? No. This is a barrel, bolt, and magazine kit with no serialized receiver. It ships directly without FFL paperwork.
How many rounds does the .45 ACP magazine hold? 16 rounds, compared to higher-capacity 9mm UZI magazines. The larger .45 ACP cartridge reduces capacity in the same magazine body.
How long does the caliber swap actually take? Under 60 seconds with no tools. Remove the cover, pull the 9mm bolt, unscrew the 9mm barrel, install the .45 ACP bolt and barrel, and you’re done.
Why does the .45 ACP UZI bolt use tungsten inserts? To add mass and control the cyclic rate correctly for the heavier .45 ACP cartridge. Tungsten is roughly twice as dense as steel, adding weight without changing the bolt’s size.
What ammunition works best in this conversion? Standard pressure .45 ACP FMJ runs reliably. Lighter or underloaded ammunition may cause function issues in the blowback design. Test with your specific ammo before relying on it.
Is a 16″ barrel NFA-compliant for a semi-auto UZI? Yes. A 16″ barrel on a semi-auto long gun meets the minimum rifle barrel length requirement under federal law.
Find more genuine UZI conversion kits and .45 ACP accessories at gunpartspalace.com.
