{"product_id":"bcm-mk2-receiver-extension","title":"BCM MK2 Receiver Extension for AR-15","description":"\u003cp\u003eThe BCM MK2 Receiver Extension is an 8-position intermediate-length buffer tube for AR-15 and M4 rifles, supplied as a bare tube with no buffer, no action spring and no stock.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eA carbine buffer and a carbine action spring will not work in this tube. The MK2 requires an MK2-specific buffer and an M16 rifle-length action spring, and there is no way around that.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThis is the point people get wrong, so it is worth being blunt about it. The MK2 is an intermediate-length receiver extension: longer than a carbine tube, and designed around a longer spring and a purpose-made buffer. Dropping in the carbine buffer and carbine spring from your existing build will not give you a working rifle. You need a \u003cstrong\u003eBCM MK2 buffer\u003c\/strong\u003e and an \u003cstrong\u003eM16 rifle action spring\u003c\/strong\u003e to go with it. If you would rather buy the tube, buffer, spring, castle nut and end plate as one matched set, the \u003ca href=\"\/products\/bcm-mk2-recoil-mitigation-system-mod-1\"\u003eBCM MK2 Recoil Mitigation System Mod 1\u003c\/a\u003e does exactly that; and if the MK2 tube is already in the rifle and you only need the buffer itself, that is the \u003ca href=\"\/products\/bcm-mk2-buffer-mod-1\"\u003eBCM MK2 Buffer Mod 1\u003c\/a\u003e.\u003c\/p\u003e\u003cp\u003eWith the correct parts in it, the MK2 is a well-made tube: machined from 7075-T6 aluminium, hard coat anodised to Mil-A-8625F Type III Class 2, cut to Mil-Spec dimensions but with a slightly smaller dimension where the stock slides on, which is what removes the stock wobble that plagues ordinary tubes. The interior is given a dry lube spray coating. It offers eight stock positions rather than the usual six.\u003c\/p\u003e\u003ch3\u003eWhy shooters choose the BCM MK2 Receiver Extension\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEight positions\u003c\/strong\u003e — finer length-of-pull adjustment than a six-position carbine tube\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTightened stock interface\u003c\/strong\u003e — a slightly smaller sliding dimension takes out stock wobble\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e7075-T6, hard coat anodised\u003c\/strong\u003e — Mil-A-8625F Type III Class 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDry lube interior coating\u003c\/strong\u003e — applied from the factory\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTakes standard Mil-Spec stocks\u003c\/strong\u003e — USGI, BCM, Colt, LMT, SOPMOD, VLTOR and Stag Arms\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhat the BCM MK2 Receiver Extension fits\u003c\/h3\u003e\u003cp\u003eThreads into AR-15\/M4-pattern lower receivers with a standard threaded rear, and Bravo Company USA state it is usable on most AR-10 platforms as well. It suits UK straight-pull AR-15 builds, where the buffer and spring return the carrier after every hand-cycled stroke, which is precisely why the correct spring and buffer matter. It takes Mil-Spec dimension stocks from USGI, BCM, Colt, LMT, SOPMOD, VLTOR and Stag Arms. \u003cstrong\u003eSupplied as a tube only.\u003c\/strong\u003e You must add an \u003ca href=\"\/products\/bcm-mk2-buffer-mod-1\"\u003eMK2 buffer\u003c\/a\u003e and an M16 rifle action spring — a carbine buffer and carbine spring will not function in it — and the castle nut, end plate and stock are also not included. Fitting needs a castle-nut wrench, and the nut should be torqued and staked or thread-locked.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003ePlatform\u003c\/th\u003e\n\u003ctd\u003eAR-15 \/ M4; usable on most AR-10 platforms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFits\u003c\/th\u003e\n\u003ctd\u003eLower receivers with a standard threaded rear; Mil-Spec stocks from USGI, BCM, Colt, LMT, SOPMOD, VLTOR, Stag Arms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eType\u003c\/th\u003e\n\u003ctd\u003eIntermediate-length receiver extension, tube only — requires an MK2 buffer and an M16 rifle action spring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e7075-T6 aluminium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eHard coat anodised, Mil-A-8625F Type III Class 2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAdjustment\u003c\/th\u003e\n\u003ctd\u003e8 stock positions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eBravo Company USA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMPN\u003c\/th\u003e\n\u003ctd\u003eBCM-MK2-RE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eBuy the tube, but buy the right buffer and spring with it. \u003cstrong\u003eOrder the BCM MK2 Receiver Extension today\u003c\/strong\u003e — in stock at Xtreme Tactical Gun Parts with free tracked UK delivery in 7–10 days.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eExplore more:\u003c\/strong\u003e \u003ca href=\"\/collections\/ar-15-parts-accessories\"\u003eAR-15 Parts \u0026amp; Accessories\u003c\/a\u003e, \u003ca href=\"\/collections\/rifle-shotgun-stocks\"\u003eRifle \u0026amp; Shotgun Stocks\u003c\/a\u003e or browse all \u003ca href=\"\/collections\/bravo-company-usa\"\u003eBravo Company USA\u003c\/a\u003e.\u003c\/p\u003e","brand":"Bravo Company USA","offers":[{"title":"Default Title","offer_id":42843550253136,"sku":"BCM-MK2-RE","price":64.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0550\/4978\/1328\/files\/bcm-mk2-receiver-extension-1.jpg?v=1786504493","url":"https:\/\/xtremetacticalgunparts.co.uk\/products\/bcm-mk2-receiver-extension","provider":"Xtreme Tactical Gun Parts","version":"1.0","type":"link"}