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9/22/2017 12:11:25 AM
Posted: 10/3/2005 8:19:16 AM EDT
[Last Edit: 10/3/2005 12:24:17 PM EDT by SamColt]
term gets thrown around quite a bit.

This is what I want - I want 2 mil-spec 20" barrels - bayo lug, taper, chrome lined, finish, 1/7 twist.

So I go to a company listed on this site and they show 2 offerings - 1 is 4140 and the other is 4150 steel. i just want good quality barrels and I have always used "mil-spec" as a standard. Should I? And how do we really know what is mil-spec and what isn't? I have hunted the internet for a few hours trying to find the official word on what an AR-15 barrel should be made of and how it should be finished if it is to be considered "mil-spec".

Maybe I should have checked Black Rifle II?

But I thought I would go straight to those that know - ARFCOM.

Link Posted: 10/3/2005 9:01:49 AM EDT
There are several specs which cover the barrel, then there is also the prints that are referenced in the 'mil spec' for the M16A2 & M16A4.

True 'in spec 20" barrels will have the following:
1:7 Twist
4150 Steel
Chrome Lined bore & chamber
Use an M16 chamber (some call it a 5.56 chamber) not a .223 or wylde chamber
Forged Front sight base (FSB)
FSB is held in place by 2 taper pins (not straight pins and not roll pins)
sling swivel is plastic coated and riveted in place
Manganees phosphate coating off all the parts PRIOR to assembly
A2 (Govt) Profile (narrow under the handguards).

There are various specs concering the barrel materials, chambering, and coatings. I have copies of some of these if you'd like them.

If you want something as close as you can get to a 'mil spec' barrel then go to SAWSALES and buy a Colt 20" Govt barrel.

Bushmaster produces a pretty good facimilie at a lower price, and when you're lucky they will even have it in 1:7 twist.
Link Posted: 10/3/2005 11:15:30 AM EDT
Forest great information - thank you Sir!

Thait is exactly what I was looking for.

BravoCompany seems to have exactly what I need only they are currently sold out of the 4150 1/7 barrels. I will write them and see if they expect more.

If anybody else knows where I might find them let me know....

Link Posted: 10/3/2005 11:19:50 AM EDT
Link Posted: 10/3/2005 11:22:34 AM EDT
I guess I'll have to go over and check out Bravo Companie's barrel offerings. I was unaware they had 1:7 twist 4150 20" barrels. Good to know there are more companies suppling the good stuff.
Link Posted: 10/3/2005 11:30:50 AM EDT
[Last Edit: 10/3/2005 11:31:27 AM EDT by YELLOWV]
There is a reason Bravo Co. I out of them. Those bbls and uppers are awesome. EVERYTHING a Colt has cheaper.
Link Posted: 10/3/2005 11:35:30 AM EDT
Link Posted: 10/3/2005 11:48:26 AM EDT

Originally Posted By Forest:
I guess I'll have to go over and check out Bravo Companie's barrel offerings. I was unaware they had 1:7 twist 4150 20" barrels. Good to know there are more companies suppling the good stuff.

Bravo Co. stated that they will have the 20" govt profile upper in stock again by mid October.

Please also note that these Bravo's latest 20" models have M4 barrel extensions.

Bravo Company Manufacturing's NEW 20-inch Govt Profile...thread link
Link Posted: 10/3/2005 12:23:47 PM EDT
now I have a problem. I'm putting together a couple A2s.

FSB height - man I'm getting closer but these flat top uppers wont help me. I need the standard height FSB and a barrel only - I already have the uppers and lowers.

Thanks for all the help.

Link Posted: 10/3/2005 1:44:33 PM EDT
[Last Edit: 10/3/2005 1:50:29 PM EDT by BravoCompanyUSA]
Link Posted: 10/3/2005 1:47:40 PM EDT
Link Posted: 10/3/2005 1:51:59 PM EDT
Link Posted: 10/3/2005 1:57:09 PM EDT

Originally Posted By BravoCompanyUSA:
That looks like a perfect summary to me. I would add that the barrel would need to be HPT and MPI for it to be Mil-Spec.

You are correct, thanks for the update.

so I don't beleive the USGI M16's have M4 ramps.

Again correct.
Link Posted: 10/3/2005 2:46:22 PM EDT
[Last Edit: 10/3/2005 3:19:20 PM EDT by boltcatch]
SamColt, I understand the urge to have an A2 (or two). While I highly recommend Bravo Company, since they don't as of now offer A2 uppers, if you really must have a mil spec A2 upper, you might as well sell the barrel-less uppers you have now and just buy a couple of take-offs from M16A2's.

Armament Services International has some new and like new (the link) - A2 upper .

CDNN has had some now and then, too, but they're out right now.

It's nice to hear that the new B Co. uppers have all those features -- I think I'll get a 20" when it comes time to make my A4gery. Between them and companies like CMT and Sabre, I think that Bushmaster, etc., are going to be facing some more competition. I was looking at my Sabre upper today and I finally realized that the faint marks over the barrel stamping means that the barrel was parked before the FSB was installed.
Link Posted: 10/4/2005 7:06:28 AM EDT
Thanks boltcatch - I think you are right. These will rarely if ever see a safe for extended periods of time. I intend to shoot the snot out of them - my point: I will quit worrying about the upper and lower matching and go ahead and try to find some new M16 take offs. That is what I am looking for anyway - not a matching finish.

Bravo Co. Let me ask you this just for grins. If I drop the A2 plan and go with your A4 upper assembly shown here will my 2 spare Colt "carry handles" I have laying around mount properly? ie site alignment etc?
Link Posted: 10/4/2005 8:15:05 AM EDT
Link Posted: 10/5/2005 11:39:50 AM EDT
[Last Edit: 10/5/2005 11:41:26 AM EDT by boltcatch]
This is mine, btw, from CDNN:

It's on an RRA lower (the old kind with no logo, just text) with Colt furniture on it; internal parts are Colt, CMT, and RRA.
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