{"product_id":"spikes-tactical-st5bg01-bolt-carrier-group-hpt-mpi-223-rem-5-56-m16-ar15-phosphate-steel","title":"Spikes Tactical St5BG01 Bolt Carrier Group HPT\/MPI 223 Rem\/5.56 M16\/AR15 Phosphate Steel","description":"Spikes ST5BG01 Bolt Carrier Group HPT\/MPI 223 Rem\/5.56 M16\/AR15 Phosphate Steel\u003cbr\u003eThe Spike's Tactical HPT\/MPI M16 Bolt Carrier Group for 223 Remington\/5.56 NATO features a Mil-Spec 8620 tool steel M16 bolt carrier w\/shrouded firing pin. The carrier has 5.3.1.2 MIL-STD-171 phosphate finish inside and out with 1.2.2.2 MIL-STD-171 hard chrome bore. It is laser-engraved with ST Spider logo which is visable through ejection port door opening. The carrier key is attached with Grade 8 hardware and properly staked per the Mil-Spec. The bolts are CNC machined from Carpenter FALSE. 158 and have 5.3.1.2 MIL-STD-171 phosphate finish inside and out. All bolts are shot peened per the current Mil-Spec and individually High Pressure Tested (HPT) and then Individually Magnetic Particle Inspected (MPI). The tool steel extractor is shot peened, has a 5.3.1.2 MIL-STD-171 phosphate finish, and is fitted with a Mil-Spec black extractor spring insert and Mil-Spec Viton o-ring. The Mil-Spec firing pin has a 1.2.2.2 MIL-STD-171 hard chrome finish. The Mil-Spec cam pin also has a 5.3.1.2 MIL-STD-171 phosphate finish. The Mil-Spec firing pin retaining pin has a 5.3.1.2 MIL-STD-171 phosphate finish.\u003cbr\u003eType: Bolt Carrier Group\u003cbr\u003eModel: M16\/AR15\u003cbr\u003eFinish: Phosphate\u003cbr\u003eSize: 223 Remington\/5.56 NATO\u003cbr\u003eMaterial: Steel\u003cbr\u003e\u003cbr\u003eManufacturer: Spikes\u003cbr\u003e Mfg Number: ST5BG01\u003cbr\u003eModel: Bolt Carrier Group\u003cbr\u003ePurpose; Replacement\u003cbr\u003eSeries: HPT\/MPI 223 Rem\/5.56","brand":"Spike's Tactical","offers":[{"title":"ST5BG01 \/ AR-15 Parts \/ Spike's Tactical","offer_id":43142443401321,"sku":"11100551","price":189.21,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0659\/8341\/4377\/files\/SS_99790.jpg?v=1776707945","url":"https:\/\/westerngunstore.com\/products\/spikes-tactical-st5bg01-bolt-carrier-group-hpt-mpi-223-rem-5-56-m16-ar15-phosphate-steel","provider":"Western Gun Store","version":"1.0","type":"link"}