KAK AR-15 Lower Parts Kit Mil Spec Trigger Group/Trigger Guard/A2 Handle/Springs. These AR15 Lower Parts Kits from KAK include extra bolt catch pins extra extractor springs extractor housings and pistol grips. In addition these kits contain extra Mil-Spec bolts extractor springs and pistol grips providing extra bolts or other compatible attachments to complete your lower receiver build. When you need high quality yet affordable AR-15 parts look no further than the KAK AR-15 Lower Parts Kit. Specifications for KAK AR-15 Lower Parts Kit: Manufacturer: KAK Industry Gun Model: AR-15 Condition: New Package Contents: KAK AR-15 Lower Parts Kit KAK AR15-LP-KT-010: AR-15 Lower Parts Kit Mil Spec Trigger Group/Trigger Guard/A2 Handle/Springs