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Most Helpful Positive Review
Spendy but quality built
This cal exchange kit will only work on the MCX gen 2. Quality built and you can swap barrels in less than 5 min if you have the proper torque wrench in hand. Great if you shoot 300BLK for self-defense but want to go to the range and train without blowing your entire savings.
Most Helpful Negative Review
Buyer beware
This product may not work with your MCX! SIG made a subtle change to the bolt design so, if your MCX was built with a bolt of the original design, this barrel is incompatible. If you get a bolt with this product (the product details do not indicate that you will but mine came with one) you will be f...
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mcx caliber exchange
Everything you need to swap .300 blkout to 556. Easy to install, thx sig engineers! Shoot just as true as the .300 blkout. Great for multiple caliber set ups. A can is the only thing needed to finish out the project.
Would recommend: Yes