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Posted: 5/29/2015 8:35:37 AM EDT
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just wondering what people find works great as a mk12 barrel? 18" with rifle length gas system |
| I have a BCM 18" SS match grade with ion-bond coating, very nice barrel and as far as I can tell it's super accurate. If you are on a budget, spare no expense on your barrel (especially for a mk12 build) and bolt, but you can shave some cost by finding blemed uppers and lowers etc. |
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Here are the top 25 shooters in the SPR section of the 1 MOA all day challenge: SPR Division (AR/AK/FAL/M1A etc WITH magnified optics) at 100 yards 1.Mike_P: Larue Stealth upper .223 Rem 18"/13.2" - Predatobr Black gold trigger + Atlas Bipod + A2 stock - 12x SWFA SS in LT104, 77gr FGMM, Groups 0.597 / 0.345 / 0.249 / 0.248 / 0.265 = avg .340 MOA 2.Lennyo3034: Home build 223, Krieger 7.7 twist, March F 3-24X42, 77SMK over 8208. Groups: .568"/.526"/.661"/.503"/.581"= .568" average= .542 MOA 3. Rowlock: AR15, Home built Rock River 24", 5.56 NATO. Leupold Mark AR MOD 1 4-12x40mm. Federal Gold Medal .223 Remington 69 grain BTHP. Groups: 0.6175" / 0.9050" / 0.3185" / 0.6170" / 0.8873" = avg. 0.6691" = 0.639 MOA 4. SpeyRod, SPR, LaRue Tobr 5.56, 77OTM Berger over 22.5gr Varget and Rem 7 1/2, (.649, 1.017, 1.039, .778, 1.072)=.911-.224=.687/1.047=.656moa 5.InfiniteGrim: Home Build 18" LW50 5.56 / SWFA 5-20HD / Nosler 77gr Handloads: .701/.782/.580/.768/.744 = .715 MOA 6.FALARAK: Self built Krieger .223 20" LaRue Rail, LaRue MBT trigger, LaRue Harris bipod, PRS - Leupold VariX-III 6.5x20 in LaRue LT-104 - 77gr SMK handload 24.5gr Varget CCIBR - Groups 1.017 / 0.823 / 0.792 / 0.573 / 0.576 = avg .756" = .723 MOA 7.akethan OBR 16" 7.62 / IOR 4-14 MP8/ 168gr GMM .818/.773/.610/.1.06/.397 = .733 MOA 8. lefty-weaver-g19. Built by me. Black hole weaponry custom barrel, vltor upper, timney trigger, SWFA fixed 10X mrad scope. Hand loaded 69 grain smk H4895 .811, .640, .361, 1.044, .834, average .738 9.Larue_Tactical tOBR 16" 556/ 77gr GMM .617 .623 .657 .969 .979= .769 10. MDMOORE99: Olympic Arms K8 5.56 - Primary Arms 4-14X44 Mil FFP Scope - Handloads. Groups .562/.876/.736/1.171/.724=avg .8138" = .777 MOA 10.Lennyo3034: Home build 223, Douglas SPR barrel with CLE chamber, Bushnell Elite SMRS 1-8.5X24, 69SMK over 8208. Groups: .989"/.612"/.673"/866"/.924"= avg. .813"= .777 MOA 11.Skg_Mre_Lght: : DPMS Classic 20, Modified- Vortex PST 4-16x EBR-1 -Geiselle trigger- Handloads. Groups: .556"/ 1.261"/ .938"/ .582"/ .683"/ avg .927"= .8038 MOA: 12.Eric802:18" BHW barrel, PA 4-16x44 scope, 75gr BTHP handloads (LC brass, RE-15): .912, .731, 1.158, .720, .779; avg. .860", .821 MOA. 13.BuickDan/AR-15 18" SPR homebrew .223/RRA 2-stage trigger/Mueller APT 4.5-14X40/Hornady 55 gr V-max handloads Groups: .744" .864" .716" .885" 1.101" Avg= .862" .8231MOA 14. Face454 20" Krieger Barrel .223, Tasco 16X scope, 75gr Black Hills: 1.111, 1.146, .579, .551, .944; avg. .8662", .8273 MOA 15..JohnTlag: Knights LPR - Leupold CQBSS - Handloads: 25 grains BLC-2 with 77 grain SMK's in LC brass.. .736,.726,.581,1.030,1.070 = .829 MOA 16. EVR: ArmaLite M15NM 5.56 - Factory Condition {polished trigger} - Redfield 4-12 scope PA Mount - Groups: 1.016/.852/1.079/.853/.733 = avg. .9066" = .866 MOA 17. Face454 26" 6.5 Grendel Bartlien Barreled Precision Firearms Upper Nightforce 8-32x56, 123gr Hornady AMAX: 1.018, .692, 1.248, 1.065, .602 AVG: .925", .883 MOA 18.AR-180: Stag Lower with a Varmint parts kit, Bushnell Scope, 0.618" / 0.994" / 0.560" / 1.143" / 1.116" = 4.431" / 5 = 0.8862" 19. trobertson5-0:Knight's Armament SR15 5.56- Kreiger barrel- Leupold MK 1.5-5 SPR- MK262 76 gr. Groups: .889"/ 1.449"/ 1.04"/ .419"/ .924"/ avg .944 = .901 MOA 20.Ronnl001/Les Baer thunder ranch ar15/.596+.625+.965+1.023+1.168+1.392"/6=.9615" = .918 MOA AVERAGE. 21. themagikbullet. .223 SPR upper built by Ayan at boltcarrier.com. Geissele SD-E trigger. SWFA 5-20x50. Black Hills 77gr. 1.397, .707, .777, .812, .941. Average .926" 22.. L_JE: Noveske w/.223 18" WOA barrel - Vortex PST 2.5-10x - Black Hills 77SMK .223. Groups: 0.651"/0.651"/1.026"/1.026"/1.526" = avg 0.976" = 0.932 MOA 23. VBC.223 AR-15. 22" SS bull bbl. Geissele G2S trigger. Zeiss Victory FL 6-24x56mm. 53 gr. SMK (#1400) over 27.2 gr. of Varget 1.146, 0.596, 0.926, 1.256, 0.936. Avg = 0.972" or 0.928 MOA 24, Steelhead43 .741 1.235 1.096 1.076 .530 .678 =.9356 BMC receiver, Rainier UM SPR barrel, 69SMK's with W748 and 77SMK's with CFE223 25. MrZeat: RRA Varmint EOP 16" .223 Rem - Aero Lower Geissele SSA-E - Leupold Mark AR MOD 1 6-18x40mm - Handloads. Groups: .741/.935/1.357/1.042/.984 = avg 1.048 = .966 MOA Several Kreiger's on that list, a couple Douglas and Black Hole Weaponry barrels as well. A buddy of mine has a Rainier UltraMatch that has shown promise. I'm running a cheap DPMS barrel and I haven't shot the challenge yet. Hopefully I'll find a good load and get on the board sometime. ETA: Added a link to Black Whole Weaponry and Rainier http://www.shop.blackholeweaponry.com/18-556-Special-Purpose-Rifle-MK-12-SPR-Mod-0-18-556-SPR-MK12-Mod-0.htm http://www.rainierarms.com/rainier-arms-ultramatchtm-223-wylde-barrel-18-spr (More of an SPR barrel) How important is the Ops Inc profile to you? |
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Is what you mean? |
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If you're actually wanting a Mk 12 barrel profiled for the Ops Inc/AE brake and collar, I made a list with links at the end of this linked post:
https://www.ar15.com/forums/t_6_20/445848_Ops_Inc_Allen_Engineering_Picture_and_Discussion_Thread__56K__PREPARE_UR_ANUS____.html&page=1#i4334555 |
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Great information Burt. I've copied it here for easier access: Ops Inc/AE profiled barrel vendors: 18" barrels: Douglas 18" 1:7 twist SS rifle-length gas: High Caliber Sales (black finish?), Compass Lake Engineering (available in 1:7 or 1:8 twist and choice of finish), Spectre Precision (1:7 twist, bead blasted), Spectre Precision (1:7 twist, black finish), Spectre Precision (1:8 twist, bead blasted), Spectre Precision (1:8 twist, black finish) WOA 18" SS, 1:7 twist, Wylde chamber, rifle-length gas, M4 Barrel extension (model # 5SPRr): Adco, Brownells (be sure to get the right model number). Bison Armory 18" SS, Wylde chamber, 1:7 twist, midlength gas, M4 feed ramps (Link) Criterion 17.9" chrome-moly, rifle-length gas, 1:8 or 1:7 twist, match or Wylde chamber, M4 feed ramps: Compass Lake Engineering (choose chamber and twist ratio) Krieger 17.9" SS, rifle-length gas, 1:7.7 or 1:7 twist, match or Wylde chamber, M4 feed ramps: Compass Lake Engineering (choose chamber and twist ratio) |
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Quoted:
Great information Burt. I've copied it here for easier access: Ops Inc/AE profiled barrel vendors: 18" barrels: Douglas 18" 1:7 twist SS rifle-length gas: High Caliber Sales (black finish?), Compass Lake Engineering (available in 1:7 or 1:8 twist and choice of finish), Spectre Precision (1:7 twist, bead blasted), Spectre Precision (1:7 twist, black finish), Spectre Precision (1:8 twist, bead blasted), Spectre Precision (1:8 twist, black finish) WOA 18" SS, 1:7 twist, Wylde chamber, rifle-length gas, M4 Barrel extension (model # 5SPRr): Adco, Brownells (be sure to get the right model number). Bison Armory 18" SS, Wylde chamber, 1:7 twist, midlength gas, M4 feed ramps (Link) Criterion 17.9" chrome-moly, rifle-length gas, 1:8 or 1:7 twist, match or Wylde chamber, M4 feed ramps: Compass Lake Engineering (choose chamber and twist ratio) Krieger 17.9" SS, rifle-length gas, 1:7.7 or 1:7 twist, match or Wylde chamber, M4 feed ramps: Compass Lake Engineering (choose chamber and twist ratio) Thank you, sir. *ETA: I went with a WOA SPR barrel. My reasoning was that I simply don't have enough trigger time at this stage to feel worthy of a Douglas/Krieger/Bartlein, etc . . . I haven't shot it yet (rifle has been a very slow, labor-of-love build due to limited funds), so I can't comment on accuracy yet. |
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I have a Douglas MK 12 barrel from Superior Barrels. Unfortunately I never got it to shoot well. If I got another high end barrel I would probably go Kreiger over Douglas. My DPMS barrel has shown promise. Here is a group from a ladder load I was shooting.  I believe I made a mistake and that is actually 77gr Nosler bullets. I had them in a baggie when I split a box with a friend. I've got more loaded, I just haven't gotten the rifle back out to the range. Here is the rifle I shot the group with. 
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Yup, very good barrel IMO |
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Quoted:
I have a BCM 18" SS match grade with ion-bond coating, very nice barrel and as far as I can tell it's super accurate. If you are on a budget, spare no expense on your barrel (especially for a mk12 build) and bolt, but you can shave some cost by finding blemed uppers and lowers etc. I have a 16" BCM 410 barrel that shoots very well. However, if I were to build a mk12 i'd probably go with a Superior Barrels SPR Barrel A bit spendy but I've heard good things |
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I am not very good at shooting groups. That said, despite my inconsistent aim point, and no rear bag, I got my WOA SPR barrel to 10 rounds just over an inch at 100, using CBC 77gr ammo.
The WOA barrels are priced nicely, and I have yet to hear bad things. They are quite popular in the Mk12 thread and are what ADCO has built theirs on. That also being said, if you want to do a clone, go Douglas and do it right. |
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