Skip to main content

Sig Cal-X Kit MPX, 9mm, 4.5", G2 9mm CALX-MPX-4B-9-G2

Sig Sauer
Sig Cal-X Kit MPX, 9mm, 4.5", G2

Sig Cal-X Kit MPX, 9mm, 4.5", G2 9mm CALX-MPX-4B-9-G2

Add UPC Alert

Sig Cal-X Kit MPX, 9mm, 4.5", G2 9mm CALX-MPX-4B-9-G2

Sig Sauer
Sig Cal-X Kit MPX, 9mm, 4.5", G2

UPC
798681555062: MPN
CALX-MPX-4B-9-G2: Brand
Sig Sauer: Model
MPX Caliber Exchange Kit: Caliber
9mm: Type
Conversion Kit: Finish
Nitride: Barrel Length
4.50"

Store	Price	Shipping rate	Report	Show more
The Modern Sportsman	$579.00	$0-$10
Sig Sauer	$799.99	no info
Out Of Stock
BattleHawk Armory	$634.25	Handguns/Long guns $19.95 - $39.95
Not Just Guns	$660.99	Calculated in Cart
GrabAGun.com	$664.99	14.58
Tombstone Tactical	$667.00	Free on Guns
Impact Guns	$668.39	Free Shipping On Select Items - Free shipping on most guns!
Eurooptic	$679.99	FREE Shipping over $250, Firearms $13.95 flat rate S/H
Gunventory	$708.25	$19.99
KyGunCo	$713.99	Most Firearms ship for FREE
Classic Firearms	$723.98	Calculated in Cart
Riflenetics	$729.99	Low Shipping
Supreme Arms	$749.99	Free Shipping Over $300
LeadFeather Guns & Ammo	$755.99	See price at checkout
MidwayUSA	$772.99	Free Shipping
Alpha Defense	$774.35	19.99
BET Armory	$836.99	8.95
Blackstone	$858.99	Firearms & Suppressors $19.99 \| Accessories $14.95 - $19.99
Tin Star Shooting Range	$1,022.14	$8.95 Shipping on all Orders (Except AK & HI), Ammo ships for $15.95 No tax outside OK

No matching products found.

Sig Cal-X Kit MPX, 9mm, 4.5", G2 9mm CALX-MPX-4B-9-G2

Thinking about selling your Sig Cal-X Kit MPX, 9mm, 4.5", G2 9mm CALX-MPX-4B-9-G2?

Compare offers from our partners and start the process online in minutes.

Guns.com

Get an Offer →

Customer reviews

Leave a review

This product hasn't received any reviews yet. Be the first one to rate, describe your experience or upload photos

Sig Sauer MPX Caliber Exchange Kit for sale

2 days ago

Sig Sauer MPX 9mm 4.5" Bbl X-Change Kit - $579

Sig Sauer MPX 9mm 4.5" Bbl X-Change Kit - $579

$579.00

SIG Sauer Factory MPX G2 Caliber Conversion Kit CALX-MPX-4B-9-G2 9mm Luger 4.5" Barrel Kit Includes New Barrel Assembly Matte Black

0

UPC: 798681555062
MPN: CALX-MPX-4B-9-G2

26

Recent coupons (10)

14% OFF Red Dot Sights + 2% in OP Bucks back

REDT

Expiration date 2026-Jul-23 Store Optics Planet Report

5% Off Sabre Products

GUNDEALSMSABRE5

Expiration date Unknown Store Palmetto State Armory Report

No Code Needed

Expiration date 2026-Jul-26 Store Brownells Report

10%

liberty26

Expiration date 2026-Jul-31 Store Moriarti Armaments Report

12% OFF Sitewide (Excl. Apply)

JULY1226

Expiration date Unknown Store AR15Discounts Report

10% Off Exigent Defense Suppressors

EXIGENT10

Expiration date Unknown Store BattleHawk Armory Report

Free Shipping on Guns & Orders $99+ for USAGO Members

Cool

Expiration date Unknown Store USAGO Report

10% off LMT DEFENSE FIREARMS

LMT10

Expiration date Unknown Store BattleHawk Armory Report

15% Off Savior Equipment (Some Excl. Apply)

SAV15

Expiration date Unknown Store GunMagWarehouse Report

17.50% OFF (Some Excl. Apply)

2507426

Expiration date Unknown Store Right To Bear Report

Add a Coupon

Active rebates (10)

Gold Dot Rebate

Brand Speer Expiration date 2026-Jul-31

Protect & Save Rebate R13938

Brand Federal Expiration date 2026-Sep-01

250 Years of Freedom

Brand Rugged Suppressors Expiration date 2026-Jul-31

Summer 2026 Rebate Specials

Brand Bond Arms Expiration date 2026-Aug-01

SilencerCo Always American $250 Credit

Brand SilencerCo Expiration date 2026-Aug-16

Foxtrot Consumer Promotion

Brand Sig Sauer Expiration date 2026-Sep-01

Silent Summer Rebate

Brand IWI Expiration date 2026-Nov-01

Beretta Shotgun Rebate

Brand Beretta Expiration date 2026-Aug-01

Gear Up - Free XDM Elite 10mm

Brand Springfield Expiration date 2026-Sep-01

Browning Youth Shooting Firearm Rebate

Brand Browning Expiration date 2027-Jan-01

Recent comments

Partisan Disruptor FRT - $233.75 (apply 15% savings on website) + Free Shipping & 2% Back in OP Bucks

I do not see this price for what’s pictured

20 min 38 sec ago ByBlueSkivic
PMC X-TAC 5.56x45mm 62 Grain FMJ 1000 Rnd - $454 with code GUNDEALS10 + Free Shipping

Vendor will not help you when 90 rounds of the ammo shows up damaged. You will have to eat it. Plenty of other great ammo vendors that will help you when there is a problem. Check these guys out on Google. You’ll see how much they don’t care.

42 min 46 sec ago Bytoecutter76
KEXMO Pocket Folding Knife, 3.34” Sharp 14C28N Stainless Steel Blade with Ergonomic G10 Handle and Deep-Carry Clip EDC Knives Liner Lock for Men Women Outdoor Indoor Camping Fishing Hiking, Green - $17.99

Deal no longer works as of 7/20, now $22.

3 hours 10 min ago ByEasyCZ
GLOCK G17 G5 9mm 4.49" 17rd Pistol w/ Ameriglo Night Sights - POLICE TRADE-IN - $397.04

I had no problems with them, my GForce Blade8 was shipped within 10 days

4 hours 22 min ago Bygabenbaker
Arex Zero 1 Compact 9mm 3.85" 15rd Pistol, DA SA Decocker, Manual Safety, Graphite Black - $379.99

This is incorrect. Alpha Defense has the price at $655.36. However, Atlantic Firearms has it for: $399.99

https://atlanticfirearms.com/arex-zero-1-compact-black...

7 hours 17 min ago Byglaicius
Ruger LCP MAX 380 ACP Semi-Auto Pistol Magpul EHG - $379.99

You can find the gun for 200 on sale and get the magpul grip for 40. 400$ for this is kinda silly.

7 hours 21 min ago ByMicah007
Arex Zero 1 Compact 9mm 3.85" Barrel 15rd Semi-Auto Pistol, 2 Mags, Graphite Black / FDE - $379.99

$655.36 even after adding to cart

12 hours 22 min ago Bycrash84977
Spike's Tactical Waterboard Instructor Stripped AR-15 Lower - $84.99 (Add to Cart)

It’s incredibly gross, and it’ll keep me from ever buying a Spike’s product.

15 hours 2 min ago Bybairty
Magnum Research Desert Eagle MK XIX 50 AE Trump Promise - $3999

bootlicker

15 hours 13 min ago Byspaghettitoss
JRA Gallant 5.56 NATO 18" Barrel W/ Compensator Battle Worn Original Wood Handguards 30 Rd S.F. Stock No Bayonet Lug - $929.99

I think these are okay. Incorrect barrel bothers me the most, and limited warranty, which you may need. Poor resale. It's essentially a replica with a few original parts. I have 2 JRA builds, one very poor, one good, but nothing from them in the last 5yrs. If you can afford a Noveske you probably should consider Jeff Miller at Hillbilly Firearms, and build a Galil on a Tortort or CNC Warrior receiver. I think he's still operating, and is very knowledgeable. Or buy used from an auction site. If you handle a well-made Galil ARM with the correct markings, barrel, bipod, etc. you will regret the JRA. Just my opinion. Original Galil parts are harder to find now, like mags, decent furniture, tritium sights and bipods. Milled receiver builds are harder to recreate than typical stamped AK builds so quality is important. I have a soft spot for Galils.

15 hours 15 min ago Byrumors