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M4 vs. M4A1 Visual Distinctions gt; AR Discussions gt; AR15. COM Can anyone report how a Colt M4 is marked vs a Colt M4A1 in US service? For example, on the fire selector, I do know the M4A1 is marked "SAFE-SEMI-AUTO" but is the M4 marked "SAFE-SEMI-BURST"? (reflecting of course the primary difference between the two being the full auto vs 3-round burst capability) Also, on the left magazine housing on the lower receiver, does Colt mark them "M4 CARBINE
Difference between A2 and M4 Barrel Profile - AR15. COM 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 short section ahead of the gas block reduced in diameter to accommodate mounting an M203 (usually called the M4 cut)
Optic Setup that will Cowitness with Carry Handle Gooseneck Mount . . . I have an m16a2 upper with the integral carry handle and recently bought one of the Aimpoint gooseneck mounts for it I tried to mount an Aimpoint M4 optic on it with the factory mount and no spacer, but was surprised to find out that I could barely use the factory irons through it I also have an Aimpoint M5 on a regular Larue LT660 mount and was wondering if the LT661 mount would make that
Why Zero at 50 (200M) instead of 25 (300M) - AR15. COM 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 M16 M4 operator's manual A recent copy of this manual is available for download at the Manual Depot Procedures in the manual will not be repeated here 2
Official M4A1 USASOC URG-I and NSW URG-I and Clone Picture and . . . Quote History Originally Posted By joglee: Official part list Geissele Mk16 Geissele ACH DD 14 5" MID-LENGTH CHF BARREL DD MK12 gas block Surefire SF4P Standard M16 M4 BCG Standard M4 receiver Standard M4A1 lower with H2 buffer SOPMOD stock Will be interesting to see who's receiver and BCG the URG is initially issued with
Army M4 qualification tips gt; General Discussion gt; AR15. COM 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 200yds, your bullet is 11" high so you want to be a little low when zeroing otherwise you may shoot over the top of the 175-200m target HTH Good Luck qualifying!
AR-15 Stocks - Weight refrence guide gt; Build It Yourself gt; AR15. COM M4 Type: 17 0 (Mil spec tube, standard buffer) M4 Type: 14 3 (Commercial tube, standard buffer) Fixed short stocks (telestock buffer spring): Stubby: 14 6 (with standard buffer) Sully: 17 75 (with standard buffer) If you know the weight of the buffer spring tube you can subtract it from these to get your answers