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This upper / lower combo was designed by Protofirearms. You can find his videos on YouTube here: https://www.youtube.com/channel/UCZhOUeAygTxhKt3qVLChCYw
LBRY Tags: ar15; protofirearms; upper; 3dprinted; gun
LBRY Tags: ar15; protofirearms; upper; 3dprinted; gun
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