Current order processing time frame: 3 business days
Due to frequent problems with USPS First Class Mail, this shipping option is currently unavailable.

Notice: This site is for qualified and uniformed members of law enforcement, military, and first responders only. See a list of qualified individuals.

Sig Sauer MCX Rattler Conversion Kit - 5.5" .300 BLK

More Views

Sig Sauer MCX Rattler Conversion Kit - 5.5" .300 BLK


Be the first to review this product


Availability:Out of stock

Ask a question


Sig Sauer MCX Rattler Conversion Kit - 5.5" .300 BLK


This conversion kit is designed to work ONLY on existing MCX Rattlers. If you have a non-Rattler MCX this will not work according to Sig Sauer even if you already have a new MCX with the tapered barrel and bolt. This can be used to convert a 5.56mm Rattler or as a backup/spare part for your .300 Blackout Rattler. Bolts are not included.

Additional Information

UPC Code 798681586288
Caliber .300 Blackout
Manufacturer Sig Sauer
Trigger Pull SA No
Trigger Pull (DA) No
Overall Length No
Overall Height No
Overall Width No
Sights (detailed) No
Sight Radius No
Weight Empty No
Grips No
Frame Finish No
Frame Material No
Slide Finish No
Stock Material No
Barrel Length (in) 5.5 in
Rifling No
Number of Grooves No
Mag Capacity / Rounds No
Number of Mags No
Sound Reduction No
Accessory Rail Not Applicable
Features No
Safety (detailed) No
Competition Approval No
Magazine Well No
Additional Info No
Bullet Type No
FFL Requirements No
Warranty Warranty provided by Sig Sauer. Warranty information is available for Sig Sauer products at

Product Tags

Use spaces to separate tags. Use single quotes (') for phrases.

Product Questions

No Questions


Write Your Own Review

You're reviewing: Sig Sauer MCX Rattler Conversion Kit - 5.5" .300 BLK