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Rock river 308 billet lower

NoGutsNoGlory

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Survivalist
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Some years ago I purchased a billet 308 lower from Rock River. It's been hard to find a compatible upper to match it. I recently purchased a Aero M5 upper and it doesn't even line up at all and leaves a gap about an inch between when closed. Does anyone know of a good upper that can pair with my Rock river billet 308 lower? Any help is appreciated. Thanks.
 
I’ll keep my eyes peeled for an appropriate upper.

I’ve always found it best to order AR10-type receivers as a set. They can be squirrelly when mixing brands.
 
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