Dec 23, 2014 · In fact, the XM4 comes "first," and was a program that was originally spearheaded by the Marine Corps, I have heard (coldblue may be able to verify) that the "XM4" designation was not initially intended as the "next in sequence" for the M1/2/3 .30 Cal. Carbine series (CARBINE, CAL. 5.56MM, M4), but actually as a successor the M3 Grease Gun SMG ...

May 29, 2019 · 1-"M-16A2 carbine" 727 . "COTS" carbine 2-"XM4" with CM upper, "Property of US Govt marked, UNIQUE barrel profile. 3- "M4" with carry handle. Mythical "USGI" piece that is more or less the same as a standard USGI M4 but with an A2 upper. 4- Colt 777 "COTS" carbine from late 90s. Probably not purchased by the US Military, but still neat.

May 24, 2015 · ARDC recommended additional commonality with the M16A2, as well as lengthening the barrel to 14.5". In January 1984, 9ID revised the QRP and redesignated the proposed 5.56mm carbine as the XM4 Carbine. The Army formally approved the …

Apr 28, 2024 · Next is a 727 build, all Colt, built on an LE trade LE 6520 carbine that I swapped parts out on. Includes a C MP marked 14.5 M4 barrel assembly, Colt FA C-stamped BCG, Colt charging handle, 4-position Colt RE, Colt Fiberlite N1 stock, Colt grip, old Colt double heat shield M4 handguards, Colt A1/A2 side sling mount, and Colt A2 FH (pinned with ...

Sep 8, 2013 · Early M4 program developmental weapons were rollmarked "XM4 Carbine." Coldblue (IIRC) posted a pic once of one of these weapons from when the Marine Corps was involved in the program, it had the fixed carry handle and A2 sights. Pre-M4 carbines such as the RO727 (A2 sights) and 723 (A1 sights) were rollmarked "M16A2 Carbine."

Jun 14, 2018 · I understand the XM4 carbine was the model developed prior to the M4/M4A1 carbines. Would the XM4 have used the 2 position receiver extension with the Fiberlite stock or would the 4 position receiver extension with the waffle stock have been used or any combination of the above. Any insight would be extremely appreciated. Thanks in advance.

Aug 23, 2022 · M4 carbine: 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 finalize and approve the design, and in 1994 US …

Jul 15, 2022 · The configuration of the XM4 carbine as of September 1987 was as follows: - 0.062” gas port - Barrel extension with 52 degree ramps - Upper receiver with 45 degree feed ramps, to match extension - 2.98 oz aluminum buffer - Plastic buttstock - Double lined handguards - 14.5 inch barrel contoured to fit both the M203 and the Miles laser xmitter

Nov 13, 2017 · Augee, the FSB is not "F" marked - its standard. That's one of the reasons I bought it - I'd been looking for an original Colt 14.5" carbine barrel with standard FSB to build up a 723/727 sort of KISS/EDC LW carbine (actually, still looking). I'm really wanting to focus on A2s at this point and have acquired several XM4 type "C MB" marked uppers.

Apr 4, 2018 · AFAIK all the XM4 carbines had A2 uppers. They experimented with M203-compatible barrel profiles that aren't around now. Posted: 4/4/2018 3:25:22 AM EDT