Sig Sauer G2 Caliber Exchange Kit for Sig MPX Gen II, Black - CALX-MPX-4B-9-G2
by Sig Sauer
User Ratings
No ratings yet
Be the first to review this product
CAL-X MPX-4B-9-G2 Caliber Exchange Kit for SIG MPX Gen II. Conversion kit featuring a 4 inch barrel designed to swap caliber on MPX Gen II firearms. Provides a compact 9mm configuration for the SIG MPX platform.
Specifications
- Manufacturer:
- Sig Sauer
- Category:
- barrel
- Caliber:
- 9mm Luger
- Platforms:
- AR-15
- Length:
- 4.0"
- Estimated velocity:
- 735-1,180 fps
- MPN:
- CALX-MPX-4B-9-G2
- Required Component:
- Yes
Estimate only. Based on caliber + barrel length bucket. View details
Parts Cabinet
Track parts you own or plan to buy.
Where to Buy
Have one to sell?
Sponsored
MantisX
The smart way to train your AR build
Built your rifle — now train it. BlackBeardX installs in minutes and turns your AR into a full dry fire system with smart feedback on every pull.
Shop BlackBeardXPrice History
Current
$723.99
Lowest
$723.99
Highest
$723.99
Price Alert
Sign in to save a target price and receive an email when this component drops.
Sign In to Set AlertBundle Package
This is a bundled product that includes multiple components. The exact contents may vary - check the product description for more details.
• Complete assembly ready to use
• Multiple components included
• Value package pricing
Similar Products
Daniel Defense 16" 5.56 NATO M4 Carbine-Length CHF Barrel (07-075-08174-018)
Daniel Defense
$314.99
Criterion Barrels CORE 223 Wylde Carbine AR-15 Barrel 11.5in
Criterion Barrels Inc
$313.49
Criterion Core 13.9" .223 Wylde Mid-Length Chrome-Lined AR-15 Barrel, 1:8 (15130-CR8)
Criterion Barrels Inc
$297.99
Faxon Duty Series AR-15 Barrel 5.56x45mm NATO 10.5 Pencil Contour 1:8 Twist Black Nitride
Faxon Firearms
$143.06
Criterion Barrels 10.5" 5.56 Chrome-Lined Ultralight Hybrid Contour AR-15 Barrel (15100UL6)
Criterion Barrels Inc
$297.99
Criterion Core 12.5" .223 Wylde Carbine-Length Chrome-Lined AR-15 Barrel, 1:8, 1/2x28 (15120CR6)
Criterion Barrels Inc
$313.49
Ballistic Advantage 14.5" 5.56 Government Profile Mid-Length Modern Series AR-15 Barrel, OEM (BABL556010MO)
Ballistic Advantage
$170.00
Criterion Barrels Core AR-15 Barrel 223 Wylde 14.5" Mid-Length Chrome-Lined 1:8" Twist Black
Criterion Barrels Inc
$313.49
Builds Using This Part
No builds yet — be the first to use this part.
Related Guides
Guide
5.56 NATO, .223 Remington, and .223 Wylde: Chamber Differences Explained
A technical breakdown of the differences between 5.56 NATO, .223 Remington, and .223 Wylde chambers — what each accepts safely, and how to choose for your build.
5 min read
Guide
The AK Platform: Core Design, Strengths, and Builder Tradeoffs
A practical AK overview covering operating system basics, parts ecosystem realities, and where the AK platform shines compared to AR-pattern rifles.
8 min read
Guide
.308 Win vs. 6.5 Creedmoor for AR-10 Builds
A technical comparison of .308 Winchester and 6.5 Creedmoor for AR-10 platform builds — covering ballistics, recoil, parts availability, and which cartridge fits which use case.
5 min read