Gun Nuts Pro Line Lower Parts Kit Ambidextrous. Specifications for Gun Nuts Pro Line Ambidextrous Lower Parts Kit: Manufacturer: Gun Nuts Finish: Phosphate Fabric/Material: 8620 Steel Gun Make: AR Platform Trigger Pin Size: 0.154 in Weight: 0.571 oz Features of Gun Nuts Pro Line Ambidextrous Lower Parts Kit Entry Level Cost Effective Mil Equivalent Single Stage for builders and SHTF Kits. Package Contents: Gun Nuts Pro Line Ambidextrous Lower Parts Kit Gun Nuts SI-LPK-AMBI-PRO: Pro Line Lower Parts Kit Ambidextrous