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SI-Defense .223/5.56 AMBI Billet Receiver Sets Now Available

Posted on June 16th, 2015 by ar15news

Man, I really need to go on vacation more often! Not for the obvious reasons but because all the good stuff happens when I’m out of town. For instance, SI-Defense released their new 5.56 AMBI Billet Receiver Sets. If you follow AR15NEWS on Instagram or Facebook you’ve no doubt seen our .308 rifle we built using a set of SI-Defense .308 AMBI receivers which have their mirrored ambi controls. After months of use with the .308 set I can personally tell you they are amazing and now you can actually get your hands on the long awaited .223/5.56 set with the exact same mirrored ambi controls. 

SIDefense 5.56 Ambi Set 1

SIDefense 5.56 Ambi Set 2

I’m a huge fan of Ambi Controls on my AR’s and the SI-Defense .308 and 5.56 receivers take that to the next level. Having the exact same controls, that work exactly the same, in the exact same place on your lower makes it very intuitive and very fast to get accustomed to. These receivers even have ambi takedown and pivot pins that can be installed facing in either direction giving you a truly ambi experience. 

If this sounds like what you’re looking for, head on over to and get your order in on the new 5.56 AMBI billet sets.

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