<?xml version="1.0" encoding="UTF-8"?><rss version="2.0"
	xmlns:content="http://purl.org/rss/1.0/modules/content/"
	xmlns:wfw="http://wellformedweb.org/CommentAPI/"
	xmlns:dc="http://purl.org/dc/elements/1.1/"
	xmlns:atom="http://www.w3.org/2005/Atom"
	xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
	xmlns:slash="http://purl.org/rss/1.0/modules/slash/"
	>

<channel>
	<title>Complete AR-15 Uppers</title>
	<atom:link href="https://operationparts.com/product-category/rifle/ar15-sr15-upper-receiver/complete-uppers/feed/" rel="self" type="application/rss+xml" />
	<link>https://operationparts.com/product-category/rifle/ar15-sr15-upper-receiver/complete-uppers/</link>
	<description></description>
	<lastBuildDate>Thu, 16 Apr 2026 17:34:55 +0000</lastBuildDate>
	<language>en-US</language>
	<sy:updatePeriod>
	hourly	</sy:updatePeriod>
	<sy:updateFrequency>
	1	</sy:updateFrequency>
	<generator>https://wordpress.org/?v=6.9.4</generator>

<image>
	<url>https://operationparts.com/wp-content/uploads/2025/05/cropped-sqlogo-32x32.jpg</url>
	<title>Complete AR-15 Uppers</title>
	<link>https://operationparts.com/product-category/rifle/ar15-sr15-upper-receiver/complete-uppers/</link>
	<width>32</width>
	<height>32</height>
</image> 
	<item>
		<title>KAC-Knight&#8217;s Armament SR-16 Mod 2.1 Upper Receiver/Suppressor Package</title>
		<link>https://operationparts.com/product/kac-knights-armament-sr-16-mod-2-1-upper-receiver-package/</link>
					<comments>https://operationparts.com/product/kac-knights-armament-sr-16-mod-2-1-upper-receiver-package/#respond</comments>
		
		<dc:creator><![CDATA[Admin]]></dc:creator>
		<pubDate>Thu, 29 Jan 2026 12:59:39 +0000</pubDate>
				<guid isPermaLink="false">https://operationparts.com/?post_type=product&#038;p=178424</guid>

					<description><![CDATA[<p>KAC-Knight&#8217;s Armament SR-16 Mod 2.1 Upper Receiver/Suppressor Package (124428) First commercial release of the 11.5&#8243; SR-16 Mod 2.1 upper receiver kit! The 10.75 KAC FF RAS 5 handguard was developed for use on SR-16 platforms, specifically optimized for KAC upper receivers with a notched receiver. The enhanced barrel nut interface and robust construction keep deflection [&#8230;]</p>
<p>The post <a href="https://operationparts.com/product/kac-knights-armament-sr-16-mod-2-1-upper-receiver-package/">KAC-Knight&#8217;s Armament SR-16 Mod 2.1 Upper Receiver/Suppressor Package</a> appeared first on <a href="https://operationparts.com">Operation Parts, Inc.</a>.</p>
]]></description>
		
					<wfw:commentRss>https://operationparts.com/product/kac-knights-armament-sr-16-mod-2-1-upper-receiver-package/feed/</wfw:commentRss>
			<slash:comments>0</slash:comments>
		
		
			</item>
		<item>
		<title>KAC-Knight&#8217;s Armament SR15, KS2 Upper Receiver Kit, 14.5&#8243;</title>
		<link>https://operationparts.com/product/kac-knight-s-armament-556-ks2-upper-receiver-kit-145/</link>
					<comments>https://operationparts.com/product/kac-knight-s-armament-556-ks2-upper-receiver-kit-145/#respond</comments>
		
		<dc:creator><![CDATA[Admin]]></dc:creator>
		<pubDate>Wed, 24 Sep 2025 23:12:18 +0000</pubDate>
				<guid isPermaLink="false">https://operationparts.com/?post_type=product&#038;p=176334</guid>

					<description><![CDATA[<p>KAC-Knight&#8217;s Armament KS2 SR15 Series Upper Receiver Kit, 14.5&#8243; (121436) The KS-series of carbines is the next step in Knight’s continued refinement of the AR-15 platform. Improvements have been made to ergonomics, maintenance procedures, and function. The self-indexing, highly efficient Mod 2 gas system has been retained in this latest iteration. The straight gas tube [&#8230;]</p>
<p>The post <a href="https://operationparts.com/product/kac-knight-s-armament-556-ks2-upper-receiver-kit-145/">KAC-Knight&#8217;s Armament SR15, KS2 Upper Receiver Kit, 14.5&#8243;</a> appeared first on <a href="https://operationparts.com">Operation Parts, Inc.</a>.</p>
]]></description>
		
					<wfw:commentRss>https://operationparts.com/product/kac-knight-s-armament-556-ks2-upper-receiver-kit-145/feed/</wfw:commentRss>
			<slash:comments>0</slash:comments>
		
		
			</item>
		<item>
		<title>KAC-Knight&#8217;s Armament SR15, KS1 Upper Receiver Kit, 13.7&#8243;</title>
		<link>https://operationparts.com/product/kac-knight-s-armament-556-ks1-upper-receiver-kit-137/</link>
					<comments>https://operationparts.com/product/kac-knight-s-armament-556-ks1-upper-receiver-kit-137/#respond</comments>
		
		<dc:creator><![CDATA[Admin]]></dc:creator>
		<pubDate>Wed, 24 Sep 2025 23:10:39 +0000</pubDate>
				<guid isPermaLink="false">https://operationparts.com/?post_type=product&#038;p=176332</guid>

					<description><![CDATA[<p>KAC-Knight&#8217;s Armament SR15, KS1 Upper Receiver Kit, 13.7&#8243; (121435) The KS-series of carbines is the next step in Knight’s continued refinement of the AR-15 platform. Improvements have been made to ergonomics, maintenance procedures, and function. The self-indexing, highly efficient Mod 2 gas system has been retained in this latest iteration. The straight gas tube design [&#8230;]</p>
<p>The post <a href="https://operationparts.com/product/kac-knight-s-armament-556-ks1-upper-receiver-kit-137/">KAC-Knight&#8217;s Armament SR15, KS1 Upper Receiver Kit, 13.7&#8243;</a> appeared first on <a href="https://operationparts.com">Operation Parts, Inc.</a>.</p>
]]></description>
		
					<wfw:commentRss>https://operationparts.com/product/kac-knight-s-armament-556-ks1-upper-receiver-kit-137/feed/</wfw:commentRss>
			<slash:comments>0</slash:comments>
		
		
			</item>
		<item>
		<title>KAC-Knight&#8217;s Armament KS3 SR15 Upper Receiver Kit, 11.5&#8243;</title>
		<link>https://operationparts.com/product/kac-knight-s-armament-556-ks3-upper-receiver-kit-115/</link>
					<comments>https://operationparts.com/product/kac-knight-s-armament-556-ks3-upper-receiver-kit-115/#respond</comments>
		
		<dc:creator><![CDATA[Admin]]></dc:creator>
		<pubDate>Wed, 24 Sep 2025 22:48:34 +0000</pubDate>
				<guid isPermaLink="false">https://operationparts.com/?post_type=product&#038;p=176336</guid>

					<description><![CDATA[<p>KAC-Knight&#8217;s Armament SR15, 5.56mm, KS3 Upper Receiver Kit, 11.5&#8243; (121437) The KS-series of carbines is the next step in Knight’s continued refinement of the AR-15 platform. Improvements have been made to ergonomics, maintenance procedures, and function. The self-indexing, highly efficient Mod 2 gas system has been retained in this latest iteration. The straight gas tube [&#8230;]</p>
<p>The post <a href="https://operationparts.com/product/kac-knight-s-armament-556-ks3-upper-receiver-kit-115/">KAC-Knight&#8217;s Armament KS3 SR15 Upper Receiver Kit, 11.5&#8243;</a> appeared first on <a href="https://operationparts.com">Operation Parts, Inc.</a>.</p>
]]></description>
		
					<wfw:commentRss>https://operationparts.com/product/kac-knight-s-armament-556-ks3-upper-receiver-kit-115/feed/</wfw:commentRss>
			<slash:comments>0</slash:comments>
		
		
			</item>
		<item>
		<title>Daniel Defense MK18 RIS III Upper Receiver Group, Black</title>
		<link>https://operationparts.com/product/daniel-defense-mk18-ris-iii-upper-receiver-group-black/</link>
					<comments>https://operationparts.com/product/daniel-defense-mk18-ris-iii-upper-receiver-group-black/#respond</comments>
		
		<dc:creator><![CDATA[Admin]]></dc:creator>
		<pubDate>Mon, 17 Feb 2025 22:00:05 +0000</pubDate>
				<guid isPermaLink="false">https://operationparts.com/?post_type=product&#038;p=123417</guid>

					<description><![CDATA[<p>Daniel Defense MK18 RIS III Upper Receiver Group, Black (23-004-81721-006) The MK18 RIII™ AR15 style Upper Receiver Group is unmatched in size, weight, and performance, and is built around a 10.3 inch Cold Hammer Forged M4 Profile barrel with a Daniel Defense Flash Suppressor, a GRIP-N-RIP Charging Handle, and our carbine length gas system.  It features [&#8230;]</p>
<p>The post <a href="https://operationparts.com/product/daniel-defense-mk18-ris-iii-upper-receiver-group-black/">Daniel Defense MK18 RIS III Upper Receiver Group, Black</a> appeared first on <a href="https://operationparts.com">Operation Parts, Inc.</a>.</p>
]]></description>
		
					<wfw:commentRss>https://operationparts.com/product/daniel-defense-mk18-ris-iii-upper-receiver-group-black/feed/</wfw:commentRss>
			<slash:comments>0</slash:comments>
		
		
			</item>
		<item>
		<title>Radian Weapons Complete Upper &#8211; 14.5&#8243; 223 Wylde &#8211; 1:8</title>
		<link>https://operationparts.com/product/radian-weapons-complete-upper-14-5-223-wylde-1-8/</link>
					<comments>https://operationparts.com/product/radian-weapons-complete-upper-14-5-223-wylde-1-8/#respond</comments>
		
		<dc:creator><![CDATA[Admin]]></dc:creator>
		<pubDate>Tue, 31 Jan 2023 22:07:34 +0000</pubDate>
				<guid isPermaLink="false">https://operationparts.com/?post_type=product&#038;p=122622</guid>

					<description><![CDATA[<p>Radian Weapons Complete Upper &#8211; 14.5&#8243; 223 Wylde &#8211; 1:8 (R0024/465/466) The design philosophy behind the Radian Model 1 is simple: use the highest quality raw materials, most precise CNC machining equipment, and best components available to create a weapon that seamlessly blends form and function. Beyond quality and aesthetics, the Model 1 features fully [&#8230;]</p>
<p>The post <a href="https://operationparts.com/product/radian-weapons-complete-upper-14-5-223-wylde-1-8/">Radian Weapons Complete Upper &#8211; 14.5&#8243; 223 Wylde &#8211; 1:8</a> appeared first on <a href="https://operationparts.com">Operation Parts, Inc.</a>.</p>
]]></description>
		
					<wfw:commentRss>https://operationparts.com/product/radian-weapons-complete-upper-14-5-223-wylde-1-8/feed/</wfw:commentRss>
			<slash:comments>0</slash:comments>
		
		
			</item>
		<item>
		<title>Daniel Defense MK18 RIS III Upper Receiver Group, FDE</title>
		<link>https://operationparts.com/product/daniel-defense-mk18-ris-iii-upper-receiver-group-fde/</link>
					<comments>https://operationparts.com/product/daniel-defense-mk18-ris-iii-upper-receiver-group-fde/#respond</comments>
		
		<dc:creator><![CDATA[Admin]]></dc:creator>
		<pubDate>Thu, 12 Jan 2023 22:31:54 +0000</pubDate>
				<guid isPermaLink="false">https://operationparts.com/?post_type=product&#038;p=122577</guid>

					<description><![CDATA[<p>Daniel Defense MK18 RIS III Upper Receiver Group, Flat Dark Earth (23-004-81721-011) The MK18 RIII™ AR15 style Upper Receiver Group is unmatched in size, weight, and performance, and is built around a 10.3 inch Cold Hammer Forged M4 Profile barrel with a Daniel Defense Flash Suppressor, a GRIP-N-RIP Charging Handle, and our carbine length gas system.  [&#8230;]</p>
<p>The post <a href="https://operationparts.com/product/daniel-defense-mk18-ris-iii-upper-receiver-group-fde/">Daniel Defense MK18 RIS III Upper Receiver Group, FDE</a> appeared first on <a href="https://operationparts.com">Operation Parts, Inc.</a>.</p>
]]></description>
		
					<wfw:commentRss>https://operationparts.com/product/daniel-defense-mk18-ris-iii-upper-receiver-group-fde/feed/</wfw:commentRss>
			<slash:comments>0</slash:comments>
		
		
			</item>
		<item>
		<title>Daniel Defense M4A1 RIS III Upper Receiver Group, FDE</title>
		<link>https://operationparts.com/product/daniel-defense-m4a1-ris-iii-upper-receiver-group-fde/</link>
					<comments>https://operationparts.com/product/daniel-defense-m4a1-ris-iii-upper-receiver-group-fde/#respond</comments>
		
		<dc:creator><![CDATA[Admin]]></dc:creator>
		<pubDate>Thu, 12 Jan 2023 22:27:59 +0000</pubDate>
				<guid isPermaLink="false">https://operationparts.com/?post_type=product&#038;p=122573</guid>

					<description><![CDATA[<p>Daniel Defense M4A1 RIS III Upper Receiver Group, Flat Dark Earth (23-004-01097-011) The M4A1 RIS III features a 14.5” Cold Hammer Forged barrel with a permanently attached Daniel Defense Improved Flash Suppressor to meet the NFA required 16” length. Daniel Defense complete upper receiver groups come complete with bolt carrier group and charging handle. Features: UPPER [&#8230;]</p>
<p>The post <a href="https://operationparts.com/product/daniel-defense-m4a1-ris-iii-upper-receiver-group-fde/">Daniel Defense M4A1 RIS III Upper Receiver Group, FDE</a> appeared first on <a href="https://operationparts.com">Operation Parts, Inc.</a>.</p>
]]></description>
		
					<wfw:commentRss>https://operationparts.com/product/daniel-defense-m4a1-ris-iii-upper-receiver-group-fde/feed/</wfw:commentRss>
			<slash:comments>0</slash:comments>
		
		
			</item>
		<item>
		<title>Daniel Defense DD4 RIS III Upper Receiver Group, FDE</title>
		<link>https://operationparts.com/product/daniel-defense-dd4-ris-iii-upper-receiver-group-fde/</link>
					<comments>https://operationparts.com/product/daniel-defense-dd4-ris-iii-upper-receiver-group-fde/#respond</comments>
		
		<dc:creator><![CDATA[Admin]]></dc:creator>
		<pubDate>Thu, 12 Jan 2023 22:22:35 +0000</pubDate>
				<guid isPermaLink="false">https://operationparts.com/?post_type=product&#038;p=122571</guid>

					<description><![CDATA[<p>Daniel Defense DD4 RIS III Upper Receiver Group, Flat Dark Earth (23-191-20088-011) The DD4™ RIII™ Upper Receiver Group is built around a 16 inch Cold Hammer Forged Government Profile barrel, a GRIP-N-RIP Charging Handle, and our mid-length gas system, known to have a smoother recoil impulse, which adds to this upper&#8217;s accuracy by allowing for quick but [&#8230;]</p>
<p>The post <a href="https://operationparts.com/product/daniel-defense-dd4-ris-iii-upper-receiver-group-fde/">Daniel Defense DD4 RIS III Upper Receiver Group, FDE</a> appeared first on <a href="https://operationparts.com">Operation Parts, Inc.</a>.</p>
]]></description>
		
					<wfw:commentRss>https://operationparts.com/product/daniel-defense-dd4-ris-iii-upper-receiver-group-fde/feed/</wfw:commentRss>
			<slash:comments>0</slash:comments>
		
		
			</item>
		<item>
		<title>PRI-Precision Reflex 18&#8243; Mark 12 Mod 0 SPR Upper in 5.56 Cal. 1-7 Twist, FDE</title>
		<link>https://operationparts.com/product/pri-18-mark-12-mod-0-spr-upper-in-5-56-cal-1-7-twist-fde/</link>
					<comments>https://operationparts.com/product/pri-18-mark-12-mod-0-spr-upper-in-5-56-cal-1-7-twist-fde/#respond</comments>
		
		<dc:creator><![CDATA[Admin]]></dc:creator>
		<pubDate>Wed, 11 Jan 2023 22:07:29 +0000</pubDate>
				<guid isPermaLink="false">https://operationparts.com/?post_type=product&#038;p=122541</guid>

					<description><![CDATA[<p>PRI 18&#8243; Mark 12 Mod 0 SPR Upper in 5.56 Cal. 1-7 Twist FDE (07-55618-SPR-RDD7) This Mark 12 Mod 0, ready to shoot 5.56 upper is equipped with a 18&#8243; Douglas 416 stainless steel barrel 1-7 twist with a fitted bolt and commercial carrier, flat-top receiver, PRI flip up front gas block front sight and [&#8230;]</p>
<p>The post <a href="https://operationparts.com/product/pri-18-mark-12-mod-0-spr-upper-in-5-56-cal-1-7-twist-fde/">PRI-Precision Reflex 18&#8243; Mark 12 Mod 0 SPR Upper in 5.56 Cal. 1-7 Twist, FDE</a> appeared first on <a href="https://operationparts.com">Operation Parts, Inc.</a>.</p>
]]></description>
		
					<wfw:commentRss>https://operationparts.com/product/pri-18-mark-12-mod-0-spr-upper-in-5-56-cal-1-7-twist-fde/feed/</wfw:commentRss>
			<slash:comments>0</slash:comments>
		
		
			</item>
	</channel>
</rss>

<!--
Performance optimized by W3 Total Cache. Learn more: https://www.boldgrid.com/w3-total-cache/?utm_source=w3tc&utm_medium=footer_comment&utm_campaign=free_plugin

Page Caching using Disk: Enhanced 

Served from: operationparts.com @ 2026-04-17 23:54:09 by W3 Total Cache
-->