{"id":86530,"date":"2014-01-07T22:24:55","date_gmt":"2014-01-07T22:24:55","guid":{"rendered":"https:\/\/one.sightlinemg.com\/militarytimes\/uncategorized\/2014\/01\/07\/heckler-koch-introducing-mr556-762a1-sd-with-oss-suppressor-and-new-handguard\/"},"modified":"2026-08-08T08:15:20","modified_gmt":"2026-08-08T08:15:20","slug":"heckler-koch-introducing-mr556-762a1-sd-with-oss-suppressor-and-new-handguard","status":"publish","type":"post","link":"https:\/\/one.sightlinemg.com\/militarytimes\/off-duty\/gearscout\/2014\/01\/07\/heckler-koch-introducing-mr556-762a1-sd-with-oss-suppressor-and-new-handguard\/","title":{"rendered":"Heckler &#038; Koch introducing MR556\/762A1-SD with OSS Suppressor and new handguard"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">40 years after the introduction of the HKMP5 SD, <a href=\"http:\/\/www.hk-usa.com\/civilian_products\/civ_rifles.asp\">Heckler &amp; Koch<\/a> will release the new MR556A1-SD and MR762A1-SD. The new SD design incorporates technology from American suppressor manufacturer <a href=\"http:\/\/oss-online.com\/\">Operators Suppressor Systems<\/a> into the combat proven HK416\/HK417 platforms. The over-the-barrel, reflex design of the OSS suppressor minimizes the overall length of the rifle while maximizing sound suppression and operational configurability.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The updated platform also includes HK&#8217;s new Modular Rail System (MRS) in 14&#8243; or 9&#8243; which looks like a KeyMod compatible handguard with integrated QD sling swivel flush cups<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The OSS suppressor system also improves the HK platform by adding caliber and configuration modularity, individual suppressor component sustainability, greater than 90% reduction in blowback and bolt velocity compared to competing suppressor systems. The OSS system comprises a back pressure regulator (BPR) and a sound reduction module (SRM). The rifle is shot &#8216;unsuppressed&#8217; with the BPR installed. This reduces flash and noise noticeably, but the addition of the SRM will reduce the muzzle noise to 139db at the shooters ear.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It&#8217;s interesting that these mods are being applied to the civilian version of these rifles. Perhaps these cans find their way onto 14.5&#8243; guns to become the HK416\/HK417A6-SD at some point. There&#8217;s no doubt these rifles will be expensive. But, we won&#8217;t have a price until HK officially releases the rifles at SHOT Show next week in Las Vegas.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">[HTML1]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The OSS suppressor system also improves the HK platform by adding caliber and configuration modularity, 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