{"id":33132,"date":"2025-08-29T00:14:28","date_gmt":"2025-08-29T04:14:28","guid":{"rendered":"https:\/\/www.un9.org\/shop\/product\/ruger-ar556-mpr-450bushmaster-magpul-grip-collapsible-stk\/"},"modified":"2026-03-04T05:19:31","modified_gmt":"2026-03-04T09:19:31","slug":"ruger-ar556-mpr-450bushmaster-magpul-grip-collapsible-stk","status":"publish","type":"product","link":"https:\/\/www.un9.org\/shop\/product\/ruger-ar556-mpr-450bushmaster-magpul-grip-collapsible-stk\/","title":{"rendered":"RUGER AR556 MPR 450BUSHMASTER &#8211; MAGPUL GRIP &amp; COLLAPSIBLE STK"},"content":{"rendered":"<ul class=\"features\">\n<li>\n<p>Lower receiver is fitted with Magpul&reg; MOE&reg; grip and MOE SL&reg; collapsible buttstock on a Mil-Spec buffer tube.<\/p>\n<\/li>\n<li>\n<p>Handguard is free-floated for accuracy and the slim, 15&#8243; length provides enhanced ergonomics.<\/p>\n<\/li>\n<li>\n<p>To support the large case head of .450 Bushmaster ammunition, the .450 Bushmaster bolt is engineered with tapered lugs and machined from a high-strength superalloy.<\/p>\n<\/li>\n<li>\n<p>The Ruger&reg; Elite 452&reg; AR-Trigger is a two-stage trigger that offers a smooth, crisp, 4.5 pound trigger pull. It features a full-strength hammer spring for consistent primer ignition and a lightweight hammer that enables a faster lock time for improved accuracy.<\/p>\n<\/li>\n<li>\n<p>Magpul&reg; M-LOK&reg; accessory attachment slots along the 3:00, 6:00 and 9:00 positions with additional slots on the angled faces near the muzzle.<\/p>\n<\/li>\n<li>\n<p>Ruger&reg; muzzle brake is a radial port design that significantly reduces felt recoil and muzzle movement. The threaded barrel allows for standard muzzle accessories to be installed.<\/p>\n<\/li>\n<li>\n<p>Cold hammer-forged 4140 chrome-moly steel barrel with ultra-precise 5R rifling and black nitrided finish provides exceptional accuracy, longevity and easy cleaning. The heavy barrel profile and 1:16&#8243; twist rate maximizes accuracy with bullets ranging from 170 to 260 grains.<\/p>\n<\/li>\n<li>\n<p>Made from aerospace-grade 7075-T6 aluminum forging, the flat top upper receiver includes a forward assist, dust cover and brass deflector, and is Type III hard coat anodized for maximum durability.<\/p>\n<\/li>\n<li>\n<p>Bolt carrier and gas key have chrome-plated inside diameters to provide exceptional resistance to hot gases. The gas key is staked so that it will not loosen after extensive firing.<\/p>\n<\/li>\n<li>\n<p>Carbine-length gas system provides the most reliable function with .450 Bushmaster ammunition.<\/p>\n<\/li>\n<li>\n<p>Also includes: one, 5-round metal magazine.<\/p>\n<\/li>\n<\/ul>\n<p><\/p>\n<table>\n<tr>\n<td colspan=\"2\"><b><u>PRODUCT SPECIFICATIONS<\/u>:<\/b><\/p>\n<td><\/tr>\n<tr>\n<td>Dimension&nbsp;&nbsp;&nbsp;&nbsp;<\/td>\n<td>3.30 X 10.90 X 43.00<\/td>\n<\/tr>\n<tr>\n<td>Height&nbsp;&nbsp;&nbsp;&nbsp;<\/td>\n<td>3.3000<\/td>\n<\/tr>\n<tr>\n<td>Width&nbsp;&nbsp;&nbsp;&nbsp;<\/td>\n<td>10.9000<\/td>\n<\/tr>\n<tr>\n<td>Length&nbsp;&nbsp;&nbsp;&nbsp;<\/td>\n<td>43.0000<\/td>\n<\/tr>\n<tr>\n<td>CALIBER&nbsp;&nbsp;&nbsp;&nbsp;<\/td>\n<td>450 BUSHMASTER<\/td>\n<\/tr>\n<tr>\n<td>TYPE ACTION&nbsp;&nbsp;&nbsp;&nbsp;<\/td>\n<td>SEMI-AUTOMATIC<\/td>\n<\/tr>\n<tr>\n<td>RATE OF TWIST&nbsp;&nbsp;&nbsp;&nbsp;<\/td>\n<td>1:16&#8243;<\/td>\n<\/tr>\n<tr>\n<td>METAL FINISH&nbsp;&nbsp;&nbsp;&nbsp;<\/td>\n<td>COLORED<\/td>\n<\/tr>\n<tr>\n<td>STOCK MATERIAL&nbsp;&nbsp;&nbsp;&nbsp;<\/td>\n<td>SYNTHETIC<\/td>\n<\/tr>\n<tr>\n<td>BARREL LENGTH IN INCHES&nbsp;&nbsp;&nbsp;&nbsp;<\/td>\n<td>18.6300<\/td>\n<\/tr>\n<tr>\n<td>OVERALL LENGTH IN INCHES&nbsp;&nbsp;&nbsp;&nbsp;<\/td>\n<td>38.9000<\/td>\n<\/tr>\n<tr>\n<td>MAGAZINE CAPACITY&nbsp;&nbsp;&nbsp;&nbsp;<\/td>\n<td>5.0000<\/td>\n<\/tr>\n<tr>\n<td>DETACHABLE MAGAZINE&nbsp;&nbsp;&nbsp;&nbsp;<\/td>\n<td>Y<\/td>\n<\/tr>\n<tr>\n<td>HINGED FLOORPLATE&nbsp;&nbsp;&nbsp;&nbsp;<\/td>\n<td>N<\/td>\n<\/tr>\n<tr>\n<td>SIGHTS&nbsp;&nbsp;&nbsp;&nbsp;<\/td>\n<td>N<\/td>\n<\/tr>\n<tr>\n<td>STOCK COLOR&nbsp;&nbsp;&nbsp;&nbsp;<\/td>\n<td>BLACK<\/td>\n<\/tr>\n<tr>\n<td>WEIGHT IN POUNDS&nbsp;&nbsp;&nbsp;&nbsp;<\/td>\n<td>7.4<\/td>\n<\/tr>\n<tr>\n<td>METAL COLOR&nbsp;&nbsp;&nbsp;&nbsp;<\/td>\n<td>BLACK<\/td>\n<\/tr>\n<tr>\n<td>TYPE OF RIFLE&nbsp;&nbsp;&nbsp;&nbsp;<\/td>\n<td>MODERN SPORTING RIFLE<\/td>\n<\/tr>\n<tr>\n<td>CHECKERING&nbsp;&nbsp;&nbsp;&nbsp;<\/td>\n<td>N<\/td>\n<\/tr>\n<tr>\n<td>RECOIL PAD&nbsp;&nbsp;&nbsp;&nbsp;<\/td>\n<td>N<\/td>\n<\/tr>\n<tr>\n<td>SWIVEL STUDS&nbsp;&nbsp;&nbsp;&nbsp;<\/td>\n<td>N<\/td>\n<\/tr>\n<tr>\n<td>OTHER FEATURES:&nbsp;&nbsp;&nbsp;&nbsp;<\/td>\n<td>15&#8243; FREE FLOAT M-LOK HANDGUARD<\/td>\n<\/tr>\n<tr>\n<td colspan=\"2\" style=\"text-align:center;font-weight:bold;color:red\">NO SALE TO CALIFORNIA<\/td>\n<\/tr>\n<tr>\n<td colspan=\"2\" style=\"text-align:center;font-weight:bold;color:red\">NO DIRECT SHIP TO CALIFORNIA<\/td>\n<\/tr>\n<tr>\n<td colspan=\"2\" style=\"text-align:center;font-weight:bold;color:red\">NO SALE TO ILLINOIS PICA<\/td>\n<\/tr>\n<\/table>\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>RUGER AR556 MPR 450BUSHMASTER &#8211; MAGPUL GRIP &amp; COLLAPSIBLE STK<\/p>\n","protected":false},"featured_media":33127,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[51751],"product_cat":[70],"product_tag":[52195],"class_list":{"0":"post-33132","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_brand-ruger-sturm-ruger-co","7":"product_cat-ar-rifles","8":"product_tag-online-only","9":"product_shipping_class-flat_rate_cssi_firearms","11":"first","12":"outofstock","13":"taxable","14":"shipping-taxable","15":"purchasable","16":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/www.un9.org\/shop\/wp-json\/wp\/v2\/product\/33132","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.un9.org\/shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.un9.org\/shop\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.un9.org\/shop\/wp-json\/wp\/v2\/comments?post=33132"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.un9.org\/shop\/wp-json\/wp\/v2\/media\/33127"}],"wp:attachment":[{"href":"https:\/\/www.un9.org\/shop\/wp-json\/wp\/v2\/media?parent=33132"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.un9.org\/shop\/wp-json\/wp\/v2\/product_brand?post=33132"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.un9.org\/shop\/wp-json\/wp\/v2\/product_cat?post=33132"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.un9.org\/shop\/wp-json\/wp\/v2\/product_tag?post=33132"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}