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Posted: 7/9/2005 4:27:08 PM EDT
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What is the timeline for the different desighn changes on the M-4, specificly what years did the following come out?: Year M-4 was inroduced Year M-4 feedramps were added Year double heat shield hand gaurds were added Year M-4A1 was introduced Year T markings were added Year Front sight was changed Year front sling swivil was moved to the side Year stock was changed from 4 positions to 6 positions Years any other changes that I didn't mention came out Also what is the difference between an M-4 front sight base, and a standard front sight base, is it just the post, if it is where can I get an M-4 front sight post by it'self?.... Where can I get a correct removeable carry handle?.... |
There has always been a 4 position stock on the military carbines. 6 positions are a non Colt commerical thing. RAS number = 1997 ~ 1998 The front swivel has always been on the side. There have been two different style of swivel The front sight has always been the same. F stamped or a dimensional equivalent for flattops. Standard for early fixed carry handle carbines. |
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| Wasnt it the Marines who started it and the Army finishing it.The Army is larger so it didnt realy take off until they got behind it.First ones I beleive were in use in 91..A2 burst style fixed handle then became standard in 1993.I think 97 or 98 for the M4A1 or model#927.The 653 carbine I think was the first time the 14.5 legnth was used in this case a pencil barrel 1/12 twist. |
That is alot of questions, I covered some of that stuff in these two threads: M4gery: ar15.com/forums/topic.html?b=3&f=118&t=231110 M4A1 clone: ar15.com/forums/topic.html?b=3&f=118&t=229465 |
A side swivel is spec for a M4 or M4A1. There are two different styles. One with a reversible block for either a .750 or .625 bbl. that was used up to about 1998. The current one is only for a .750 bbl. Look at a LE6920 and you can see it. I am not saying M4s and M4A1s have the same front sight as a M16A2. All flattops have a F stamped FSB or a dimensional equivalent reguardless of the gun being a rifle or carbine. Anything with a fixed handle is has a standard FSB. |
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Year M-4 was inroduced Large scale production and deliveries started in 1994. Became Standard A in 1995. Year M-4 feedramps were added Prior to production. Year double heat shield hand gaurds were added Prior to production Year M-4A1 was introduced 1994 Year T markings were added Not sure on that, I have a 1995 M4 upper with no T marks. Year Front sight was changed Prior to production. Year front sling swivil was moved to the side Far as I can tell Colt's delivered them from the get go with the side swivel, and there are two variations. Year stock was changed from 4 positions to 6 positions Did not happen. Years any other changes that I didn't mention came out 1995 Colt's/Swan flat top upper was adopted ???? blue extractor spring/buffer replaced with black buffer 1998? M4A1 offered with optional heavy barrel 1998? flash hider peel washer changed to crush washer (just a guess on the date) 2002 new buttstock 2003 black extractor spring/buffer replaced with gold spring 2003 M4A1 standard with heavy barrel Also what is the difference between an M-4 front sight base, and a standard front sight base, is it just the post, if it is where can I get an M-4 front sight post by it'self?.... The F maked FSB used with the flat top upper is taller at the point were the front sight post screws in. The front sight post is the same as used on the M16A2. Where can I get a correct removeable carry handle? The EE. |
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When you say heavy barrel do you mean government profile heavy from the front sights forward, but light under the handgaurds, or heavy all the way back except for the M-203 cut?.... Do the 14.5 inch barrels Bushmaster offers have the higher front sight base, or the standard front sight base?.... |
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The front sight post on a modern carbine tapers slightly. On a rifle, the post is straight. The carbine post tapers to a narrower thickness to give the same sight picture as a rifle. In other words, the post will appear the same thickness even though one is farther away (rifle) and one is closer (carbine). SAW has both posts. I can post pictures if anybody wants to see them. |
You are refering to commercial Colt' items, the USGI M4/A1 front sight post is the same as the M16A2/A3/A4. |
Oh so you think I got a year to sit on my latest build and wait!!!!  Just kiddin' ya! That would be cool. 
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That is how most M4 and M4A1 barrels are. All M4 carbines have a government profile barrel. The midweight barrel was an option on a M4A1 before 2003. After 2003 it became standard and the government profile became the option on the M4A1. |
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