{"product_id":"cmmg-55de10a-barrel-sub-assembly-5-56x45mm-nato-16-1-m4-profile-carbine-length","title":"CMMG 55DE10A Barrel Sub-Assembly 5.56x45mm NATO 16.1\\\" M4 Profile Carbine Length","description":"\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003eCMMG 55DE10A Barrel Sub-Assembly\u003c\/span\u003e\u003c\/strong\u003e is a drop-in \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003e5.56x45mm NATO\u003c\/span\u003e\u003c\/strong\u003e replacement barrel intended for assembling or rebuilding a custom \u003cstrong\u003eAR-15\u003c\/strong\u003e upper. Rather than a bare blank, it ships as a true sub-assembly with the \u003cstrong\u003eM4 barrel extension already properly installed\u003c\/strong\u003e, so the builder drops it into the receiver, pins the gas system, and moves on to headspacing without an extra extension-fitting step. CMMG machines it from \u003cstrong\u003e4140 chromoly steel\u003c\/strong\u003e, cuts the classic \u003cstrong\u003eM4 contour\u003c\/strong\u003e, and finishes the entire surface in a wear- and corrosion-resistant \u003cstrong\u003eblack nitride\u003c\/strong\u003e treatment.\u003c\/span\u003e\u003c\/p\u003e\\n\\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eAt \u003cstrong\u003e16.10 inches\u003c\/strong\u003e overall and rifled with a fast \u003cstrong\u003e1:7 twist\u003c\/strong\u003e, this carbine-length barrel suits a wide range of AR-15 builds. The M4 feed ramp extension supports reliable feeding from a variety of magazine and ammunition combinations, and the carbine gas journal is positioned to work with standard carbine-length gas systems. The barrel ships with \u003cstrong\u003eno iron sights\u003c\/strong\u003e installed, leaving the upper free for a flat-top receiver, a free-float handguard, and the optic or red dot of your choice.\u003c\/span\u003e\u003c\/p\u003e\\n\\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe 55DE10A is equally at home as a build component for a feature-rich custom upper or as a direct replacement for a worn factory carbine barrel. Pair it with a quality low-profile gas block and your preferred AR-15 handguard, and the upper comes together quickly. This barrel sub-assembly brings the same build quality \u003cstrong\u003eCMMG\u003c\/strong\u003e is known for across its complete rifles to the individual component buyer.\u003c\/span\u003e\u003c\/p\u003e","brand":"CMMG","offers":[{"title":"Default Title","offer_id":54990793605442,"sku":"3186","price":189.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/7921\/5682\/files\/hires_010d1489-b409-41b6-8a63-858024a07e5d.png?v=1784186511","url":"https:\/\/centerfiresystems.com\/products\/cmmg-55de10a-barrel-sub-assembly-5-56x45mm-nato-16-1-m4-profile-carbine-length","provider":"Centerfire Systems","version":"1.0","type":"link"}