{"product_id":"bcm-mk2-buffer-mod-1","title":"BCM MK2 Buffer Mod 1 for AR-15","description":"\u003cp\u003eThe BCM MK2 Buffer Mod 1 is a bare intermediate-length buffer for AR-15 and M4 rifles, sold on its own for shooters who already run the BCM MK2 receiver extension.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eThis is the buffer only — no receiver extension, no spring, no castle nut, no end plate. It is the replacement or re-weighting part for an MK2 system you already own.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eRead that first line twice before ordering, because the two BCM part numbers look alike and are not alike. This listing is the bare \u003cstrong\u003eBFMK2\u003c\/strong\u003e buffer. If you do not already have a \u003ca href=\"\/products\/bcm-mk2-receiver-extension\"\u003eBCM MK2 receiver extension\u003c\/a\u003e and a Mil-Spec M16 rifle action spring in the rifle, this part will not fit anything you own — you want the complete \u003ca href=\"\/products\/bcm-mk2-recoil-mitigation-system-mod-1\"\u003eMK2 Recoil Mitigation System Mod 1\u003c\/a\u003e, which contains this same buffer along with the tube, the rifle spring, the castle nut and the QD end plate.\u003c\/p\u003e\u003cp\u003eWhat you get is the mechanism itself. The MK2 buffer is machined from 7075-T6 aluminium and hard-coat anodised, and it runs a longer internal counterweight travel than a carbine buffer with an internal spring to quieten the counterweight as it shifts. Longer travel means less bolt bounce and a more consistent carrier velocity, which BCM covers under US Patent 10415907.\u003c\/p\u003e\u003cp\u003eBuffer weight is the tuning lever. T2 is 5.6 oz (160 g) and T4 is 7.4 oz (210 g), and the heavier the buffer the more mass has to be moved and returned on every stroke. On a UK straight-pull AR-15 that stroke is worked by hand, so buffer weight and spring rate directly set how the action feels under the palm and how positively the carrier returns to battery — the shooter is the cycling mechanism, and they feel this component every single time.\u003c\/p\u003e\u003ch3\u003eWhy shooters choose the MK2 Buffer Mod 1\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBare buffer, sold alone\u003c\/strong\u003e — the correct part when you already run an MK2 system and want a different weight\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncreased counterweight travel\u003c\/strong\u003e — reduces bolt bounce and steadies carrier velocity\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal spring\u003c\/strong\u003e — quietens the counterweight as it shifts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e7075-T6, hard-coat anodised\u003c\/strong\u003e — the same construction standard as BCM's complete system\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo weights\u003c\/strong\u003e — T2 at 5.6 oz (160 g) and T4 at 7.4 oz (210 g) to tune the stroke\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhat the MK2 Buffer Mod 1 fits\u003c\/h3\u003e\u003cp\u003eThis buffer fits the \u003ca href=\"\/products\/bcm-mk2-receiver-extension\"\u003eBCM MK2 receiver extension\u003c\/a\u003e only, and must be run with a Mil-Spec M16 rifle action spring. It is not a carbine buffer and will not work in a standard carbine receiver extension, and a carbine spring must not be substituted — BCM is explicit that incompatible components can damage the rifle and injure the operator. If you are starting from a standard carbine buffer system, buy the complete \u003ca href=\"\/products\/bcm-mk2-recoil-mitigation-system-mod-1\"\u003eMK2 Recoil Mitigation System Mod 1\u003c\/a\u003e instead; it includes this buffer plus everything else the conversion needs. One further note on the MK2 tube itself: because it is roughly ¾\" longer than a carbine extension, some Mil-Spec stocks will not collapse all the way back to the castle nut.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003ePlatform\u003c\/th\u003e\n\u003ctd\u003eAR-15 \/ M4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFits\u003c\/th\u003e\n\u003ctd\u003eBCM MK2 receiver extension with a Mil-Spec M16 rifle action spring — nothing else\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eType\u003c\/th\u003e\n\u003ctd\u003eBuffer only — intermediate length, bare component, no tube or spring included\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\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003eT2 5.6 oz (160 g) · T4 7.4 oz (210 g)\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-BFMK2-M1-T2 · BCM-BFMK2-M1-T4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eOnly buy this if the MK2 tube is already in the rifle. \u003cstrong\u003eOrder the MK2 Buffer Mod 1 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":"T2 (5.6 oz)","offer_id":42843550679120,"sku":"BCM-BFMK2-M1-T2","price":159.99,"currency_code":"GBP","in_stock":true},{"title":"T4 (7.4 oz)","offer_id":42843550711888,"sku":"BCM-BFMK2-M1-T4","price":154.99,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0550\/4978\/1328\/files\/bcm-mk2-buffer-mod-1-t2.jpg?v=1786504678","url":"https:\/\/xtremetacticalgunparts.co.uk\/products\/bcm-mk2-buffer-mod-1","provider":"Xtreme Tactical Gun Parts","version":"1.0","type":"link"}