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Sig Sauer MCX AR15 Conversion Kit - 16" 5.56mm NATO

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Availability: Out of stock


Quick Overview

Sig Sauer MCX AR15 Conversion Kit - 16" 5.56mm NATO
Sig Sauer MCX AR15 Conversion Kit - 16" 5.56mm NATO

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This is a new OEM Sig Sauer MCX Conversion Kit that includes an MCX upper receiver, adapters to convert the 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.

The MCX upper includes the necessary parts to utilize an existing AR lower receiver. The kit includes:

- The upper receiver with BCG, charging handle, 16" barrel
- Buffer tube eliminator (with 1913 back rail for a stock or brace)
- A side folding 1913 buffer tube receiver / adapter (to mount a stock or brace buffer tube)
- A two stage Sig Sauer Match Duo Trigger

Additional Information

UPC Code No
Caliber .223 / 5.56
Manufacturer Sig Sauer
Trigger Pull SA No
Trigger Pull (DA) No
Overall Length No
Overall Height No
Overall Width No
Sights (detailed) None
Sight Radius No
Weight Empty No
Grips No
Frame Finish Black
Frame Material No
Slide Finish No
Stock Material No
Barrel Length (in) 16.0 in
Rifling No
Number of Grooves No
Mag Capacity / Rounds No
Number of Mags No
Sound Reduction No
Accessory Rail Yes
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

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Customer Reviews

Sig Sauer MCX AR15 Conversion Kit - 16" 5.56mm NATO Review by Kxfler
Osage Co. did a great job of getting this to me quickly. Product was as described from Sig, It does come with the folding adapter for your factory stock, so you do not need to buy a folding stock if you have a military style collapsible one already. You can remove your old stock, install the adapter with your old stock, and still have your folding stock. This Kit also comes with a nice 2 stage trigger. The Upper attached to my Mil Spec SBR lower very easily. Sig included ZERO instructions (or parts diagram) on how to swap this upper or how to attach the rear adapter. Very frustrating without a simple how to manual to know you are doing it right. Sure wish there was a video that explained it, but couldn't find one. (Posted on 2/4/2019)

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