Small hole receivers of .250" are the "milspec", but during early production by Colt for the civilian market, they produced rifles utilizing a .315" spec, so as to preclude use of military uppers on civilian lowers. Out of Stock. (No reviews yet) Write a Review Write a Review. $1,259.00. Since most AR lower receivers are multi-cal, you only need to change the upper to … It consists of two parts: the upper and lower receivers. Colt Defense has taken their new monolithic upper receiver and offered it to Law Enforcement. It is forged from Aluminum and precision machined to work with all mil-spec AR15 parts. An upper receiver is joined to the lower using two take-down pins. Colt Colt LE6920 Complete Upper 5.56 16" Rating ... Colt Complete 223/5.56 16" Upper receiver with Centurion M-LOK rail, BCG and Charging handle. Colt 10.3" CQB Monolithic Upper Receiver Assembly LE6945 . It is an AR15-A1, with the “-A1” referring to the multitude of genuine Colt M16-A1 parts that make up this rifle. Colt owners often refer to having a small or large hole upper receiver (and corresponding lower receiver). Colt. AR-15 Upper Receivers. Out of Stock. This Colt AR-15 Upper Receiver comes with an ejection port cover assembly and forward assist assembly already installed. This Upper Receiver Assembly comes with a picatinny-style flattop rail for plenty of accessories, and is more than ready to offer maximum versatility. Colt 11.5 inch M4 Commando Upper Receiver Assembly Price: $800.00 (Out of Stock) (45) Colt M16/AR15 Complete Bolt Carrier Group Assembly Price: $199.99 . The receiver is the part of an AR-15 onto which you build all the other components. The other is that Colt did this as a form of intellectual property protection, so that another company’s upper receiver wouldn’t work on a Colt SP1 lower. Colt 11.5" Monolithic Upper Receiver Assembly LE6943. Colt AR15 M16 A4 flat top upper receiver group - complete 20" $829.00. Upper receiver forge markings: Offset Square is: Brass Aluminum Forging LMT is: No Forge Marks, but marked LMT or L is: LMT AF is: Alcoa Forge C AF is: Colt Alco Forge A (splintered) = Anchor Harvey Aluminum C MB is: Colt / Mueller Brass Cardinal’s head (stylized bird head) is: Cardinal Forge CH is: Colt … Upper receivers are caliber specific and play an important part in the accuracy of the rifle. Colt. Out of stock . The lower portion is the serialized and legally controlled part. SALE: $195.00 . $1,289.00. Colt M4A1 Carbine LE6920 SOCOM 5.56 16" Colt This upper is stripped, and does not include the forward assist assembly or the dust cover … The barrel is the standard GI 1/7 inch twist chrome lined barrel offering the user the ability to fire … Colt. This Colt AR-15 Upper Receiver comes with a picatinny-style flattop rail for plenty of accessories, and is more than ready to offer maximum versatility. Quick view. 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