Details
This is a new OEM Sig Sauer MCX Conversion Kit that includes an MCX upper receiver, adapters to convert a standard Mil-Spec AR15 lower receiver to accept the MCX upper receiver, and a Sig Sauer two-stage trigger. The trigger installation is required to ensure proper operation of the MCX upper receiver. Using your existing trigger is not recommended and may lead to malfunction.
Sig's MCX conversion upper receivers include the necessary parts to install on an existing AR lower. That means you can essentially build your own pistol or SBR or convert an existing lower into a Rattler.
The kit includes the complete upper with 5.5" .300 Blackout barrel, bolt carrier group, buffer tube eliminator / 1913 back (for mounting a brace or stock), 1913 side folding adapter (for mounting a buffer tube for brace or stock), Sig's Match Duo 2 stage trigger, and a 1913 QD adapter.
The Rattler has a two position gas valve for running suppressed and unsuppressed.
Note: All NFA rules apply.
Additional Information
| SKU | UAMCX-5B-300-BLK-TAP |
|---|---|
| UPC Code | 798681587735 |
| Caliber | .300 Blackout |
| Manufacturer | Sig Sauer |
| Frame Finish | Black |
| Barrel Length (in) | 5.5 in |
| Accessory Rail | Yes |
| Warranty | Warranty provided by Sig Sauer. Warranty information is available for Sig Sauer products at https://www.sigsauer.com/support/warranty/. |
Product Questions
Product Questions
- Does this kit come with a bcg?
- How soon can you get these back in stock?
- Do you have to switch triggers if it is already an MCX Virtus?
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Customer Reviews
- Awesome kit Review by Mike
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Complete kit. Unbox, bolt on, and play! (Posted on 7/2/2020)Quality Price Value - Worth the money Review by Eli
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verified no flip up sights with this kit but other then that, the fit and finish of this upper is amazing. The trigger is a match grade pulling around 4 pounds for me. Shipping was fast and everything as expected. (Posted on 4/16/2020)Quality Price Value - Awesome Review by Andrew
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Fits perfectly on my pistol lower. Functions flawlessly. (Posted on 11/20/2019)Price Value Quality - Excellent. Although missing a few pieces Review by David
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Excellent price on a hard to find price. Everything installed properly and easily. However no Sig flip up sights were included despite being advertised above. Also, the hammer spring was incorrect. Fortunately I had a spare but something to be cognizant of. So, no flip up sights, improper hammer spring, but other than that, excellent. (Posted on 8/19/2019)Value Quality Price
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