May 29, 2019 · Simultaneously, when the XM4 became the M4, Colt appears to have shifted the R0723 and R0727 family under the umbrella of R0777, dropping the R072x family. These …

May 24, 2015 · The Colt model R0720 (XM4) is listed as having a 14.5" "A2" profile barrel; "Burst" fire control; an "A2 with M203" upper receiver; A2 front and rear sights; and M4 hand guards. …

Sep 8, 2013 · Colt originally designed the prototype for this new weapon under a 1985 contract with the military in which Colt agreed to build and test forty "XM4 Carbines." In 1990, the …

Dec 23, 2014 · The RO777 situation would also help to make sense of the XM4 and M4 model numbers and commercial and export designations - when the M4/M4A1 series was type …

Apr 28, 2024 · The sear block is cut down, so running a Colt FA BCG (C-stamped, MPC), Colt grey charging handle, Colt grey Delta ring, Colt large "D" forward assist, Colt A2 FH (pinned …

Jun 14, 2018 · I have a Colt A2 upper with feed ramps, M4 handguards, will be having a 14.5 M4 barrel reprofiled to the intermediate XM4 profile and will weld a spacer from Adco and an A2 …

Jul 15, 2022 · On Jun 12, 1985, contract DAAA21-85-C-0192 was signed that officially started the XM4 program Between 1985 and 1987, Colt’s identified several areas were commonality …

Nov 13, 2017 · Bolt/bolt carrier were marked with typical Colt markings. I plan to use it to build an XM4 or RO727-looking carbine on an SBR lower. Its like new and appears original. I'd like to …

Aug 23, 2022 · Colt received an initial development contract in 1984, and by 1986 first XM4 carbine prototypes were delivered to US Army for initial tests. It took several more years to …

Jan 31, 2025 · New Old Stock Brass Aluminum Forging Enterprises, LLC (Square Forge), Colt M16A2 / XM4 Upper Receiver Price includes shipping via UPS Ground to lower 48 (Buyer …