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m4    
A {macro} processor for {Unix} and {GCOS} which is more
flexible than {cpp}. m4 copies its input to the output,
expanding macros which can be either built-in or user-defined.
m4 has built-in functions for including files, running {Unix}
commands, doing integer arithmetic, manipulating text in
various ways and recursing. m4 can be used either as a
{front-end} to a compiler or as a stand-alone tool.

{sendmail}'s configuration file (/etc/sendmail.cf) is writen
in m4 macros.

There is a {GNU m4 v1.1
(ftp://gnu.org/pub/gnu/m4-1.0.tar.Z)} by Francois
Pinard and a {public domain} version
by Ozan Yigit and Richard A. O'Keefe
(FTP from any {386BSD}, {NetBSD} or
{FreeBSD} archive). A {Macintosh} version is {here
(ftp://nic.switch.ch/pub/software/mac/src/mpw-c/)}.

See also {m3}, {m5}.

["The M4 Macro Processor",
Kernighan & Ritchie, Jul 1977].


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  • M4 vs. M4A1 Visual Distinctions gt; AR Discussions - AR15. COM
    The USGI M4 Carbine is Colt's model number RO920 and roll marked: Property of US Govt M4 Carbine The USGI M4A1 is marked: Property of US Govt M4A1 Carbine and is model number RO921 On the commercial side, the RO977 is the commercial and export version of the M4, and can be had in safe-semi-auto, and rollmarked M4 Carbine M4 and M4A1 are USGI
  • Benelli M4 Clone - Panzer M4 Review Test by IraqVeteran8888 . . .
    The MAC 1014 is a much higher quality clone, and a more exact M4 copy than the Panzer (which cuts some corners and takes some liberties) For instance, the Panzer's gas pistons are NOT chrome plated where as the MAC 1014's are
  • Maybe a dumb question, but what does Block 1, Block 2, Block 3 . . .
    USSOCOM released a series of improvements to the M4 upper + CQBR Mod1 programs The SOPMOD blocks reference the included handguards, optics, lasers, etc which accompanied those improvements "Block 3" is more like a turn of phrase to include the URGI currently being fielded by USASOC
  • zeroing peq15, peq15a, and peq16 gt; Lights and Lasers gt; AR15. COM
    so our unit went to fire night m4 qual the other night- and it was a disaster we were looking at conflicting TMs, nobody actually could find any real information about how to zero these lasers, and all of the NCO's were just going off of 'bro science' knowledge We had a very hard time hitting targets under nods because of it
  • AR15 Exploded Diagrams in pdf eps ai dwg gt; AR Discussions gt; AR15. COM
    M4 Barrel Assembly A3 Removable Carry Handle Bolt, Carrier Charging Handle A2 Stock CAR Stock Magazine Complete M4 Complete A2 Complete M4: Complete A2: Other File Types M4 Exploded Diagram in AI(Ver 8), EPS(AI Ver 8), PDF and DWG with Red Bushmaster Snake M4 Exploded Diagram in AI(Ver 8), EPS(AI Ver 8), PDF and DWG with White Bushmaster Snake
  • A Visual Library of AR-15 Barrel Profiles
    Government profile barrels that are significantly shorter than the 20” barrel required the addition of “cutouts” on the barrel forward of the front sight base to be able to attach an M203 grenade launcher Examples of government profile barrels with the M203 cutouts include the Colt 14 5” M4 barrel and the Colt 16” 6920 barrel
  • Standard Issue M4 Configurations - 2018 Edition - AR15. COM
    Its a Colt M4 with TA31F, M4 RAS for both branches The Army M4 has a Matech, USMC M4 has a KAC rear sight Army has a PEQ-15 and M952V similar light no light USMC M4 has a PEQ-16 And that's about it Some units have an Aimpoint instead of ACOG That's really about it tho Same as its been the last decade
  • Army M4 qualification tips gt; General Discussion - 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!
  • Midlength or Carbine? gt; AR Basics - AR15. COM
    NSWC-Crane Mid-Length Gas System Testing Shows Increased Performance Service Life For M4 Carbines Last week’s NDIA Armaments Forum ended with a briefing by Naval Surface Warfare Center – Crane, of what is this year’s most applicable topic, for both the US military as well as manufacturers of commercial AR variants
  • A1 Front Sight Base height vs. A2 Front Sight Base height - AR15. COM
    M16A1E1, M4 -- 2 325 -0 020 [the M16A1E1 was the prototype for the M16A2] M4, M4A1, -- 2 357 +0 000 -0 020 M16A4 All have the same 8-32 thread for the front sight post One quarter turn of the post equals 0 007 change in height





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