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A Visual Library of AR-15 Barrel Profiles (Page 2 of 2)
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Originally Posted By Molon: The drawing states that it weighs 2.25 pounds. That would place it in HBAR territory. https://www.ar15.com/media/mediaFiles/28568/lilja_recce_barrel_drawing-2149113.jpg For comparison . . . Colt 16" HBAR barrel (6721): 2 pounds, 3.4 ounces. https://www.ar15.com/media/mediaFiles/28568/colt_16_inch_hbar_6721_02-1338222.jpg ... Originally Posted By Molon: Originally Posted By MS556: How would one classify the 16" Lilja M4 Navy profile per NSWC Crane specs? The drawing states that it weighs 2.25 pounds. That would place it in HBAR territory. https://www.ar15.com/media/mediaFiles/28568/lilja_recce_barrel_drawing-2149113.jpg For comparison . . . Colt 16" HBAR barrel (6721): 2 pounds, 3.4 ounces. https://www.ar15.com/media/mediaFiles/28568/colt_16_inch_hbar_6721_02-1338222.jpg ... I was rockin it with my 6721 in 1990… my second rifle after my 6520. Just had to buy a 6920 upper to boot for coolness |
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@Molon Should BRT be included? Attached File BRT |
Change is the only constant. - Heractilus
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Originally Posted By urbankaos04: @Molon Should BRT be included? https://www.ar15.com/media/mediaFiles/22392/1D33C93A-8173-41EB-9F73-EF682B3358F6_png-2236221.JPG BRT I've never owned one of those. I might have to add one to The List. .... |
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Originally Posted By Molon: I've never owned one of those. I might have to add one to The List. .... Originally Posted By Molon: Originally Posted By urbankaos04: @Molon Should BRT be included? https://www.ar15.com/media/mediaFiles/22392/1D33C93A-8173-41EB-9F73-EF682B3358F6_png-2236221.JPG BRT I've never owned one of those. I might have to add one to The List. .... @Molon there is a pretty long thread (70+ pages) on that other site about these barrels. |
Change is the only constant. - Heractilus
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Originally Posted By urbankaos04: @Molon there is a pretty long thread (70+ pages) on that other site about these barrels. I haven't posted there in years. |
All that is necessary for Trolls to flourish, is for good men to do nothing.
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Originally Posted By urbankaos04: @Molon there is a pretty long thread (70+ pages) on that other site about these barrels. Are the gas port sizes listed in that thread? |
All that is necessary for Trolls to flourish, is for good men to do nothing.
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Originally Posted By Molon: Are the gas port sizes listed in that thread? Originally Posted By Molon: Originally Posted By urbankaos04: @Molon there is a pretty long thread (70+ pages) on that other site about these barrels. Are the gas port sizes listed in that thread? @Molon Doesn’t look like port sizes are disclosed: Attached File Attached File |
Change is the only constant. - Heractilus
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Originally Posted By Rick410: Big thanks for all your effort to put together this post. Prime example of signal over noise. |
"Over the years, it has become increasingly difficult to tell the difference between skilled trolls versus fucking morons." DK-Prof
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Originally Posted By Molon: This isn't the Optimum that you were asking about, but the BRT 16" "Pro" is now on The List. https://www.ar15.com/media/mediaFiles/28568/brt_16_inch_pro_stamp_001-2293923.jpg .... Awesome. Curious to see what the gas port size is on that barrel. I’m not too familiar with the “Pro”. I gotta check out the specs on that barrel. |
Change is the only constant. - Heractilus
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Originally Posted By Molon: https://www.ar15.com/media/mediaFiles/28568/brt_barrel_gas_port_diameter_01-2294812.jpg .... Originally Posted By Molon: Originally Posted By urbankaos04: Curious to see what the gas port size is on that barrel. https://www.ar15.com/media/mediaFiles/28568/brt_barrel_gas_port_diameter_01-2294812.jpg .... Thanks! I updated my thread regarding GP sizes with your info. |
Change is the only constant. - Heractilus
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Originally Posted By Molon: That's a major part of the equation that some people don't seem to grasp. https://www.ar15.com/media/mediaFiles/28568/mean_radius_ppu_m193_versus_69_GMM_05-1895222.jpg .... So you're telling us that a match grade, free floated, hand-lapped, air-guaged barrel, attached to a lower with a match trigger and wearing top quality optics will shoot better than a chrome-lined, mass produced barrel with A2 handguards, a RDS and range ammo? Not sure that's the strongest argument for a heavy barrel. Maybe an apples-to-apples comparison would be more convincing. Fwiw, I don't need convincing. I'm fairly well versed on which barrels do what. Just saying that picture may be somewhat misleading to someone who doesn't know what they're looking at. Gator |
| no one has really stated on gas port sizes on the BRT Optimum HF barrels there. I thinking of getting a 13.9 they have but i saw some complaints about the 14.5 were way over gassed and this would wear a can 100% of the time. I undstand adjustable gas blacks would help as well as their gas restrictive gas tubes but i like pinned non adjustable ones. |
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Originally Posted By xFREDx: no one has really stated on gas port sizes on the BRT Optimum HF barrels there. I thinking of getting a 13.9 they have but i saw some complaints about the 14.5 were way over gassed and this would wear a can 100% of the time. I undstand adjustable gas blacks would help as well as their gas restrictive gas tubes but i like pinned non adjustable ones. That leaves: gas port bushing inserts adjustable gas tube adjustable gas upper adjustable gas key adjustable gas bolt carrier tungsten buffer weights |
Let's go Brandon!
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Originally Posted By Gator417: So you're telling us that a match grade, free floated, hand-lapped, air-guaged barrel, attached to a lower with a match trigger and wearing top quality optics will shoot better than a chrome-lined, mass produced barrel with A2 handguards, a RDS and range ammo? Show us, exactly, where I ever stated that. Oh wait, you can’t, because it never happened. You pulled some shit out of your ass and tried to pretend it’s what I said. The graphic that I posted was in response to borderpatrol’s statement about match-grade bullets. The point of the graphic I posted was to show that match-grade bullets are vastly superior to “muh mil-spec” bullets. The PPU M193 isn’t going to produce good groups no matter what barrel it’s fired from. The Colt 6721 barrel that the PPU M193 was fired from is a heavy barrel and it was free-floated. I used the same lower and match trigger and the same optic for both tests and the Colt 6721 barrel will produce consistent sub-MOA 10-shot groups when using match-grade bullets. Originally Posted By Gator417: Not sure that's the strongest argument for a heavy barrel. It wasn’t an argument for a heavy barrel, because both barrels used were heavy barrels. It was an argument for match-grade bullets. Originally Posted By Gator417: I'm fairly well versed on which barrels do what Clearly, you aren't, since you didn't know that the Colt 6721 barrel is a heavy barrel and that it can produce consistent sub-MOA 10-shot groups when using match-grade bullets. But hey, if you don’t like the data that I post, by all means regale us with your first-hand, variable controlled, statistically significant data on the subject matter. … |
All that is necessary for Trolls to flourish, is for good men to do nothing.
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Attached File I knew this was coming. Lol. |
Change is the only constant. - Heractilus
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Originally Posted By Geohans: I was rockin it with my 6721 in 1990… my second rifle after my 6520. Just had to buy a 6920 upper to boot for coolness Same order that I purchased in. LOL ... |
All that is necessary for Trolls to flourish, is for good men to do nothing.
In God We Trust. Everyone else must post data.
In God We Trust. Everyone else must post data.
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Originally Posted By backbencher: That leaves: gas port bushing inserts adjustable gas tube adjustable gas upper adjustable gas key adjustable gas bolt carrier tungsten buffer weights BRT EZTUNE Gas Tube worked as claimed for taming an over-gassed larue barrel. I'll have to do some testing to determine if the EZTUNE gas tube has any effect on accuracy/precision. .... |
All that is necessary for Trolls to flourish, is for good men to do nothing.
In God We Trust. Everyone else must post data.
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Originally Posted By Molon: BRT EZTUNE Gas Tube worked as claimed for taming an over-gassed larue barrel. I'll have to do some testing to determine if the EZTUNE gas tube has any effect on accuracy/precision. .... Interesting thought. Molon, can any of us add barrel profiles and GP sizes ? Any criteria you'd like to see used ? .223/ .223W / 5.56 only ? No issue if you'd rather not. But, I am sure many of us have a bunch of spare barrels kicking around. ( Well, I do at least ) And adding to the data might be |
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Originally Posted By bfoosh06: Any criteria you'd like to see used ? .223/ .223W / 5.56 only ? For this thread we can probably keep it to the .223 /223 Wylde/5.56 variants. .... |
All that is necessary for Trolls to flourish, is for good men to do nothing.
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Originally Posted By Molon: "Out of stock."  Originally Posted By Molon: Originally Posted By minion42: You should include the BCM enhanced medium weight fluted barrel in the last section. Really neat profile. "Out of stock." That’s all I ever see there. 
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How much crack did you have to smoke to reach that conclusion, a $20 rock or Whitney Houston level shit?
”Guitargod1985”
”Guitargod1985”
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Attached File |
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I have used Randall's profile drawings as a guide http://www.ar15barrels.com/profiles.shtml |
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Originally Posted By Molon: For starters . . . https://www.ar15.com/media/mediaFiles/28568/55_blitzkings_from_colt_6721_barrel_22_l-1863711.jpg ... 55g BlitzKings have always shot incredibly well out of just about any barrel I own. Glad I bought a shit load of them back years ago. Probably still have 16-17 of the 500ct boxes. |
I hated going to weddings. All the grandmas would poke me and say "You're next". They stopped that when I started doing it to them at funerals.
Sic semper evello mortem tyrannis
Sic semper evello mortem tyrannis
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Originally Posted By Sinister: For a while, Daniel Defense made Strength-to-Weight ratio (S2W) barrels, and Criterion makes their "Hybrid" profile. I think their "Core" series is probably the general-purpose "Happy Spot": http://www.ar15barrels.com/gfx/med-bg.gif https://criterionbarrels.com/wp-content/uploads/2019/06/16-14.5-13.9-6-600x600.jpg https://criterionbarrels.com/wp-content/uploads/2020/03/CORE-ALL-scaled.jpg I would like to know if anyone here has been in a position to observe enough samples with enough rounds through them to answer the question of whether .625in gas block systems result in increased wear of the gas hole due to increased heat, as compared to .750 setups. Not talking about full auto, just semi. |
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Originally Posted By GHPorter: Thanks for sharing. I may be confused, but I don’t see the utility of a “heavy” profile for a 16” barrel. Open to being enlightened. Heavy is awkward word. A medium profile on a 16" barrel has been very accurate in my experience. I know people are obsessed about light weight, but a SPR weight barrel really shines as far as accuracy is concerned. |
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Originally Posted By Sinister: For a while, Daniel Defense made Strength-to-Weight ratio (S2W) barrels, What kind of precision did you get with that profile? ... |
All that is necessary for Trolls to flourish, is for good men to do nothing.
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Some reference information on the subject matter . . . Stripped Barrel Weights "Stripped" means just the barrel and the barrel extension; nothing else. If you have weighed one of your stripped AR-15 barrels, post-up your data. Bonus points for posting a pic of the stripped barrel! Colt 16" "pencil" barrel (6520): 1 pound, 6 ounces.  Hodge Defense 14.5" barrel: 1 pound, 8.5 ounces.  Colt 14.5" M4 barrel: 1 pound, 9 ounces.  Colt 11.5" "FBI" barrel: 1 pound, 9.3 ounces.  Centurion Arms 16” “light-weight” barrel: 1 pound, 10 ounces.  Larue 16" "ultralight-profile" PredatAR barrel: 1 pound, 10.5 ounces.  Colt 16" government profile barrel (6920): 1 pound, 12 ounces.  Noveske 16" N4 "light" barrel: 1 pound, 12 ounces.  Colt 14.5" SOCOM barrel: 1 pound, 14 ounces.  Noveske 16" Recon medium contour barrel: 2 pounds, 1.6 ounces.  Colt 16" HBAR barrel (6721): 2 pounds, 3.4 ounces.  Larue 16" Stealth barrel: 2 pounds, 5.7 ounces.  .... |
All that is necessary for Trolls to flourish, is for good men to do nothing.
In God We Trust. Everyone else must post data.
In God We Trust. Everyone else must post data.
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Originally Posted By Molon: An M203 grenade launcher can be attached to the 20” government profile barrel without any modifications to the barrel. 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. Colt 14.5” government profile . . . Attached File You might have wondered why they only the small cut to accommodate the M203 instead of a full pencil profile the prototype m4s had.   It was for the MILES transmitter. 
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Originally Posted By 50cal: 55g BlitzKings have always shot incredibly well out of just about any barrel I own Yup. The 55 grain BlitzKing has been one of my standards for precision testing of AR-15 barrels since it was first introduced more than two decades ago. ... |
All that is necessary for Trolls to flourish, is for good men to do nothing.
In God We Trust. Everyone else must post data.
In God We Trust. Everyone else must post data.
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Originally Posted By Molon: What kind of precision did you get with that profile? ... Mid-Heavy has also worked quite well. A little heavier than issue barrels and doesn't throw balance off too badly (I counter a little added forward weight with an XH or H3 buffer). The one I'm shooting now is not chrome-lined: Attached File |
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Originally Posted By Sinister: Some scary small groups with 69s and 73s, but probably not a fair assessment since the one I got from Steve at ADCO was cut-rifled and not buttoned or hammer-forged. Originally Posted By Sinister: Originally Posted By Molon: What kind of precision did you get with that profile? ... The only S2W profile that I'm seeing offered on the Daniel Defense website is hammer forged . Makes sense that your cut rifle barrel is more accurate than those. .... |
All that is necessary for Trolls to flourish, is for good men to do nothing.
In God We Trust. Everyone else must post data.
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*Hold on to your AR-15s. Their magic must be very powerful, or they wouldn’t want them.*
JAFOM.... Just another fat old man.
________________________________
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JAFOM.... Just another fat old man.
________________________________
TOGC,IADC
A Visual Library of AR-15 Barrel Profiles (Page 2 of 2)
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