Lower receiver parts

Selector AR-15
converted_arvsm16selector_20180115204014
Selector lever for AR-15 rifles

Field Repair Kit
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Field Repair Kit.

Oops! Replacement Kit
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I can't find or damaged it Kit.

AR-15 Fire Control Group
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AR-15 Fire Control Group.

Two Stage National Match or Tactical Trigger Set
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Tactical Two Stage Trigger setup.