{"product_id":"spearhead-pedersoli-model-86-71-boarbuster-guidemaster-45-70-muzzle-brake","title":"Spearhead Machine Pedersoli Model 86 \/ 71 Boarbuster Guidemaster 45-70 Muzzle Brake","description":"\u003cp\u003eBuilt for the Pedersoli Model 86 \/ 71 Boarbuster (Mark II, HV-1 Camo, Evolution, Shadow) and Guidemaster, 45-70. True 2-baffle radial brake: 90° radial ports intersect to form expansion chambers and real baffles for recoil reduction without concussion. It stays slim at .840\" and back tapers to .709\" for a flush fit, adding only 1.125\" forward of the muzzle.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable class=\"spec-table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eDesign\u003c\/th\u003e\n\u003ctd\u003eTrue 2-baffle radial\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter\u003c\/th\u003e\n\u003ctd\u003e.840\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLength\u003c\/th\u003e\n\u003ctd\u003e1.750\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAdded length\u003c\/th\u003e\n\u003ctd\u003e1.125\" forward of the muzzle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBack taper\u003c\/th\u003e\n\u003ctd\u003e.709\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e50 g \/ 1.76 oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e17-4 PH stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInstallation\u003c\/th\u003e\n\u003ctd\u003eTensioning key included; no strap wrench needed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFits\u003c\/th\u003e\n\u003ctd\u003ePedersoli Model 86 \/ 71 Boarbuster (Mark II, HV-1 Camo, Evolution, Shadow) and Guidemaster, 45-70\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eAvailable options\u003c\/h3\u003e\u003ctable class=\"spec-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePedersoli Model 86\/71 5\/8-24\u003c\/td\u003e\n\u003ctd\u003eStainless (Guidemaster)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePedersoli Model 86\/71 5\/8-24\u003c\/td\u003e\n\u003ctd\u003eBlack Nitride (Boarbuster)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003eChoose a bore that matches or exceeds your caliber.\u003c\/p\u003e\u003ch3\u003eInstallation\u003c\/h3\u003e\u003col\u003e\n\u003cli\u003eMake sure the firearm is completely unloaded.\u003c\/li\u003e\n\u003cli\u003eConfirm the brake bore matches or exceeds your caliber.\u003c\/li\u003e\n\u003cli\u003eRemove the factory thread protector or muzzle device, and any O-ring on the threads.\u003c\/li\u003e\n\u003cli\u003eThread the brake on and hand tighten with the included tensioning key, using the ports nearest the crown.\u003c\/li\u003e\n\u003cli\u003eRemove the key after tightening.\u003c\/li\u003e\n\u003c\/ol\u003e\u003cp\u003ePrecision machined by Spearhead Machine in Canada.\u003c\/p\u003e","brand":"B\u0026B Firearms","offers":[{"title":"Pedersoli Model 86\/71 5\/8-24 \/ Stainless (Guidemaster)","offer_id":67387961049378,"sku":"SPH-3079-PEDERSOLI-MODEL-86-71-5-8-24-STAINLESS-GUIDEMASTER","price":97.57,"currency_code":"USD","in_stock":true},{"title":"Pedersoli Model 86\/71 5\/8-24 \/ Black Nitride (Boarbuster)","offer_id":67387961082146,"sku":"SPH-3079-PEDERSOLI-MODEL-86-71-5-8-24-BLACK-NITRIDE-BOARBUSTER","price":97.57,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0869\/0896\/1058\/files\/Pedersoli-01.jpg?v=1790456234","url":"https:\/\/bnbfirearms.com\/products\/spearhead-pedersoli-model-86-71-boarbuster-guidemaster-45-70-muzzle-brake","provider":"B\u0026B Firearms","version":"1.0","type":"link"}