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Old 04-18-2010, 11:41 PM
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Quote:
Originally Posted by davis View Post
well man if its sighted at 25 its prolly gonna still shoot flat at 100 but u need to check things out any way
If it's zeroed at 25 meters the bullet will strike 4-5" high at 100. About the same for yards.
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Old 04-19-2010, 12:17 AM
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Originally Posted by Beaterar View Post
Mil Spec is a term incorrectly used in most of the firearms community, Mil Spec refers to a very specific manufacturing process that only two manufactures can actually claim.

Colt and FN are the only rifle built to mil spec. They use the correct barrel steel and the correct twist. They mag particle test all the barrels and bolts. They have an on sight military inspector that gives them the mil spec stamp of approval.

What every one else builds is called close to mil spec or built to military dimensions. Some build closer to mil spec , some build anything but. That in no way means they are not great weapons, it just means they are not mil spec.

Now my goal is always to get as close to mil spec as possible, so far the best uppers I have found or closes to mil spec are Colt, CMMG, SaberDefence(M4 version only), FN (If you can find it), these guys build as close to mil spec without an onsite inspector, and may in some cases may do a mag particle test on lots rather then each barrel and bolt.

There is some great articles about this subject online.



here is all you ever need to know
http://www.ar15.com/content/page.html?id=493
beside the 1/9 twist rate, I disagree heavily on about 90% of this statement.
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Old 04-19-2010, 12:22 AM
TMHonfire TMHonfire is offline
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Just build your own AR-15 upper starting from a the barrel. M4 feed ramps are a must have, a side from what others will tell you.

Rolling Cam Pin

OPS-416 piston



Also Mil-Spec is not always the best you can get. POF-USA is no where new MIL-SPEC and they put out an AR-15 type rifle that smoke's a normal DI M4/AR-15 any day
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Old 04-19-2010, 08:26 AM
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DSA still has them for $275. There is a huge 52 page thread on arfcom discussing them.
http://www.dsarms.com/
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Old 04-19-2010, 08:48 AM
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thank u tmhonfire i must concur!!!! this chart was most likely put out by colt
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Old 04-19-2010, 01:50 PM
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Originally Posted by davis View Post
thank u tmhonfire i must concur!!!! this chart was most likely put out by colt

Actually it was put together with a cohesive effort by those who know the platform better then most.
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Old 04-19-2010, 01:52 PM
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get the 5.56 upper
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Old 04-19-2010, 04:44 PM
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Wow, I didn't mean to make anyone mad, again I'm not saying that if it doesn't meet spec its bad, I'm just saying its not mil spec.

the list was not fabricated to make one gun look better then others, it was made to compare manufacturing process.

In the end the choice is yours , it doesnt really affect me at all
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Old 04-19-2010, 08:20 PM
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Quote:
Originally Posted by 1stSarge View Post
DSA still has them for $275. There is a huge 52 page thread on arfcom discussing them.
http://www.dsarms.com/
Humm....that's interesting.
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Old 04-20-2010, 06:27 AM
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If you are looking for a good single piece upper and rail...

VLTOR VIS, you do have to add your own barrel though

www.vltor.com

great system. but $$$ after its all done.
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Old 04-20-2010, 07:43 PM
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Quote:
Originally Posted by madcritter View Post
Check out DPMS I used theirs for my last build.
http://www.dpmsinc.com/store/?cat=1525
I have been looking for a part for some time and found it on that site.. Thank you.
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Old 04-20-2010, 08:58 PM
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Quote:
Originally Posted by Beaterar View Post
Mil Spec is a term incorrectly used in most of the firearms community, Mil Spec refers to a very specific manufacturing process that only two manufactures can actually claim.

Colt and FN are the only rifle built to mil spec. They use the correct barrel steel and the correct twist. They mag particle test all the barrels and bolts. They have an on sight military inspector that gives them the mil spec stamp of approval.

What every one else builds is called close to mil spec or built to military dimensions. Some build closer to mil spec , some build anything but. That in no way means they are not great weapons, it just means they are not mil spec.

Now my goal is always to get as close to mil spec as possible, so far the best uppers I have found or closes to mil spec are Colt, CMMG, SaberDefence(M4 version only), FN (If you can find it), these guys build as close to mil spec without an onsite inspector, and may in some cases may do a mag particle test on lots rather then each barrel and bolt.

There is some great articles about this subject online.



here is all you ever need to know
http://www.ar15.com/content/page.html?id=493
Does Colt still use different size takedown pins? If so, they're not even close to "mil-spec". BCM has everything on that useless "tier" chart also. Colt and FN aren't the only 2 that use 4150 barrels in 1/7 twist.
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Old 04-20-2010, 09:06 PM
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Colts take down pins have not been different sizes sense Nam era guns, they were the first to go with the single pin size as it was a military developed improvement that colt had to use to fill there contracts.


Now it may be in the last year or two bushmaster started offering 1x7 twist barrels, but they used to be all 1x9 twist. Bushmaster is one of the few that dose use 4150 steel even in there 1x9 twist. Bushmaster also mag particle inspects there barrels and bolts but they do it by lots and not every one, still though some don't test at all.

Of course though the market dose change and shift a bit and often companies make improvements to keep up with public demand. I have seen Doublestar offer 1x7 twist barrels before , though most of there guns are 1x9.
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Old 04-22-2010, 09:13 AM
davis davis is offline
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ok now im curious all mil spec argument aside because i can see how certain things arent quite mil spec but wutever, wuts the advantage or dis advantage of a 1:7 ROT verse 1:9?
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Old 04-22-2010, 11:39 AM
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Man it hurt to read that!

What bullet weights (length) do plan to use? Twist and weight are inversely proportional.
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