{"product_id":"cmmg-bbl-300blk-16-1-mr-4140cm-sbn","title":"Cmmg Bbl 300blk 16.1\" Mr 4140cm Sbn","description":"Perfect for building your custom AR15 upper group. Comes with properly installed M4 barrel extension. All barrel sub-assemblies are properly head spaced.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFeatures\u003c\/b\u003e :\u003cbr\u003e\u003cul\u003e\n\u003cli\u003e1:7 Twist 4140 Chrome moly\u003c\/li\u003e\n\u003cli\u003e5\/8X24 thread pitch\u003c\/li\u003e\n\u003cli\u003eMulti Role profile\u003c\/li\u003e\n\u003cli\u003e,Carbine length gas port .750\" gas block Journal, 300 Blackout chamber,\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CMMG","offers":[{"title":"Default Title","offer_id":45840349561051,"sku":"CMMG30DF80A","price":186.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/1072\/7131\/files\/RPLCMMG30DF80A.jpg?v=1720910386","url":"https:\/\/www.atcostammo.com\/products\/cmmg-bbl-300blk-16-1-mr-4140cm-sbn","provider":"AtCostAmmo.com","version":"1.0","type":"link"}