Standard Issue M4 Configurations - 2018 Edition - AR15.COM
Mar 20, 2018 · My last issued M4 in Iraq, 2008-09 in an Army Infantry company was Colt M4 KAC Rail system Matech BUIS Aimpoint "M68" (M4) Airtronic M203 railed leaf sight PEQ15 PSQ18 IR sight for …
Need M4 feedramps cut in a A1 upper - AR15.COM
Jul 27, 2025 · FYI, a M4 extension will work just fine in a receiver not cut for the extension. The only problem is when you run an extension with out M4 ramps in a receiver with M4 ramps cut into it. This …
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A1 upper with or without M4 feed ramps - AR15.COM
Jun 11, 2025 · A1 upper with or without M4 feed ramps - is it necessary? 1st retro build, and all my other upper receivers have had M4 feed ramps. My build is based of a Carbine. I have read mixed reviews …
Difference between A2 and M4 Barrel Profile - AR15.COM
Dec 28, 2016 · M4 feed ramps will be up to the mfg. A military M4 barrel is similar to a 20" A2 barrel, with about 5.5" removed between the chamber area and the gas block/fsb, M4 feed ramps, and a …
Early M4 Configuration(s) and Unusual M16-Derived Carbines in …
Jul 15, 2022 · If you were issued, or encountered, early versions of the M4 in your military service, I have some questions.Referencing this promotional video, what was your experience with the M4 …
6920 roll marks through the years > Colt > AR15.COM
Jan 16, 2022 · The Sporter M4 Carbine was the first change to the roll marking of the original Colt's Law Enforcement Carbine. I got mine new in March 2011, no date on plastic birth bag, barrel date 12/10 …
Why Zero at 50(200M) instead of 25(300M) > AR Discussions
Jun 25, 2006 · An Improved Battlesight Zero for the M4 Carbine and M16A2 Rifle 1. Current Army/Marine Corps battlesight zero and it's procedures are well described in TM9-1005-319-10, the …
Army M4 qualification tips > General Discussion > AR15.COM
May 1, 2008 · When zeroing the M4 at 25m, set the BDC to 6/3 +2. Make all your elevation changes on the front sight so the BDC will work. Center your group in the lower half of the center bullseye. At …
M855A1 Accuracy and Velocity (updated) > Ammunition > AR15.COM
Nov 5, 2023 · My kid shot his M4 w/ACOG in a lot of Guard competitions at higher altitude in New Mexico, Wyoming, Utah, and Colorado. I'm fairly sure the density altitude had the bullets flying close …