I saw a thread in General Discussion where people were looking for stripped lowers. At the time of writing this post we have the following:
(will make best efforts to keep this up to date)

Palmetto State Lower + Omni upper combo

ATI Omni Hybrid Polymer AR-15 Receiver Sets
And some complete carbines:

Colt 16" 9mm Carbine
(will make best efforts to keep this up to date)

Palmetto State Lower + Omni upper combo

ATI Omni Hybrid Polymer AR-15 Receiver Sets
And some complete carbines:

Colt 16" 9mm Carbine
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