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AR Lower Comparison Spikes, Palmetto State Armory and Seekins - http://fotar15.com/ar-lower-comparison-spikes-palmetto-state-armory-and-seekins/

Custom AR15 Lower: Spike Tactical Receiver, Magpul CTR, Troy Battle Ax Grip, YHM Single Sling Mount - http://fotar15.com/custom-ar15-lower-spike-tactical-receiver-magpul-ctr-troy-battle-ax-grip-yhm-single-sling-mount/

Spikes Tactical AR-15 Enhanced Lower Parts Kit, Complete, Semi-Auto - SLPK301 - 855319005440