300 Blac

SIG CALXMCX5B300TAP Cal-X Kit, Sigmcx, 300 BLK,

Barrels

UPC 00798681587728

Compare prices

1 offer · 0 in stock · sorted by best price

Retailer	Price	Stock	Last checked	Deal
East Valley Tactical	$685.33	Out of stock	14m ago	Go to deal

Prices and stock are from each retailer's latest check and can change. Price Dope may earn a commission from retailer links. Disclosure

Description

Factory replacement 5.5" barrel for the MCX Rattler Genuine replacement barrel for the 5.5" 300 Blackout Rattler. Complete with barrel and gas block assembly..

Specs

Brand	Sig Sauer
Category	Barrels · Parts
Caliber	300 Blackout
UPC	00798681587728
Color	Black
Model	MCX

Finish	Nitride
Series	Kit
Material	Carbon Steel
Firearm_fit	Sig MCX Rattler
Similar_items	Kit
Length	5.50"

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D.O.P.E.Price history

Lowest price across connected retailers, from every price check we've recorded.

Current best: $685.33
Low: $685.33
High: $685.33
Tracking since: Oct 8, 2026

One price check so far ($685.33 on Oct 8, 2026). The chart fills in as retailers are re-checked.

Recent price checks (1)

Date	Retailer	Price	Stock
Oct 8, 2026, 5:15 PM PT	East Valley Tactical	$685.33	Out of stock

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