American Tactical Imports has their own polymer AR-15 lower receiver. Polymer is much less expensive than metals like aluminum and steel. The ATI Omni complete lower is priced at $134.95 while the stripped lower is $49.95. The pricing is great but are they as good as an Aluminum lower? The jury is still out on that.
It seems from reading reviews and watching some videos that the dimensions are slightly different. Not all AR-15 uppers fit on the ATI polymer lower. It seems uppers fit a little tight or too tight or not at all.
Watch this video review of the ATI Omni Polymer AR-15 lower.
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