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In the 5.56 world, I believe some vendors started offering 14.7 mid-length barrels, instead of 14.5, because it was necessary in order to get a standard A2 flash hider over the 16" minimum length. True?
How important is it that a similar 6.5 Grendel barrel accommodates pinned A2 flash hiders?
And is 14.7 the correct length needed with an A2, or is it some other dimension?
Please vote in the poll, and discuss.
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Yes, that is where the 14.7" CLGS came from, mostly for people wanting to duplicate the exact look of an M4 without needing an SBR Stamp Tax and not wanting the elongated A2 comp-looking thing on the end.
Neither of the poll choices will work for an M4/SOPMOD 1 build because they are MLGS, but either would work for a SOPMOD Block II free float build.
Now that telescoping pistol braces are the rage, it doesn't matter as much unless you were building an M4 look-alike Grendel and wanted that 14.5" look without stamp tax, the main determining factor being what buttstock you'll be using.
If your buttstock choice is based on duplicating the look of an M4 or even RO723 or RO727 (M16A2 Carbines), then you'll want the 14.7" barrel with a pinned A2 or other muzzle device, Surefire being more common on the SOPMOD guns nowadays.
My inclination is that people don't care as much about the M4 look, will slap an SB Tactical or Maxim Defense PDW tele-brace on there and go with whatever shorter pistol barrel they want.
That's the boat I'm in currently, with my 12" group buy build that will be suppressed probably all of the time.
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My thoughts are that if you add .2" and it makes it easier to pin an A2 and make it a legal rifle then just add the .2" and be done with it. No reason to limit options for such a small difference. I honestly don't know the length of an A2 but if LRRPF52 says it is so I believe him. For me being able to make as short as possible but adding a real stock would be nice. My range won't let me shoot a "pistol" or "SBR" on the 100yd range.
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i would like a 14" as that is the shortest you can go and stay legal with pinned surefire muzzle devices
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Troutguide Wrote:My thoughts are that if you add .2" and it makes it easier to pin an A2 and make it a legal rifle then just add the .2" and be done with it. No reason to limit options for such a small difference. I honestly don't know the length of an A2 but if LRRPF52 says it is so I believe him.
+1. The bigger question is what profile, estimated weight and will a 6.5 bullet fit through a Faxon slim compensator 
Let's go Brandon!
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For ease on one of mine I did get the FN middy in 14.7, easy to pin without the goofy looking extra long FH. Noticeable difference to me in length than a 16" with FH, I would have gone with a 6.5 in 14.5 or 14.7 if I could have found one at the time I was shopping.
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I think the 14.7 would be about right. More options at that point for muzzle devices. I sure hope this dicussion leads to what im hoping... 14.7 middy group buy?
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A 14.7 GB would just about do me in, lol
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In the 5.56 world you can get a 14.7 and use a stock A2 hider, or get a .2" longer hider and use a stock 14.5 barrel, which some want to do. (Colt m4, sopmod, or similar 14.5")
It's a wash either way for pinned carbines
If not trying to use an existing 14.5, I lean toward just getting the 14.7.
And all that is moot if building pistols.
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worthen86ford Wrote:I think the 14.7 would be about right. More options at that point for muzzle devices. I sure hope this dicussion leads to what i’m hoping... 14.7 middy group buy? I'm still waiting on the Monster GB carrier.
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14.7" would make a great option for a lightweight hunter with the right barrel profile.
Muzzle velocities with 123gr factory tend to be in the 2350-2420fps range with 14.5" pipes.
With the 123gr SST, that gives you hunting reach at least out to 325yds, which is more than most will ever take a shot.
2350fps mv 123gr SST .462 G1
250yds 1921fps 1008 ft-lbs
325yds 1803fps 888ft-lbs
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I can see the logic in a 14.7 it give you a wider choice of barrel treatments and make the 16" minimum length. For me I bought the 14.5 barrel and before I bought the Smith Vortex I made sure it was the 1.5 needed to get 16". This make a really sweet deer gun matched up with Nosler 129 ABLR.
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Any plans to make either? 14.5 or 14.7?
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My 14.5" Lija that Rebby set me up with is awesome!
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Neat. Trying to find a 14.5 or 14.7 Grendel barrel right now is not so easy!
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What is the ATF rule, exactly?
Could you do a 12" barrel with a pin and braze a 4" linear comp?
Do you actually need to pin it, or is the silver braze good enough?
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H2S, it's either a pin & weld or a silver solder with 1100 degree solder.
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If I could have only one rifle to do it all, it would probably be a 14.5/14.7" Grendel. I recently started a 5.56" Recce style build and settled on a 14.7" barrel because it gave me more options for muzzle devices than the 14.5" or 13.9" lengths. It's nice to have the option to use an A2 sized device to meet the minimum length requirements for those of us that can't have SBRs or suppressors. Although with your SixFiveArms flash hider, the 14.5" should be just fine.
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What would be wrong with just a 16" barrel rather than 14.7" pin and weld if you are never going to afford a suppressor?
Wouldn't the added velocity be worth it?
Steve
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laketrout Wrote:What would be wrong with just a 16" barrel rather than 14.7" pin and weld if you are never going to afford a suppressor?
Wouldn't the added velocity be worth it?
Steve
In most cases, pinning and welding a barrel is a lot of extra work to save 1.5"-2" off the overall length of a gun, and the benefit in handiness over a 16" with muzzle device is pretty minimal. In my case, I have shorter and longer rifles, but there's a 14.5-14.7" hole in my safe that's been bugging me for years. I'm in the process of rectifying that.
I decided I'd like to build the shortest rifle legally possible with a muzzle device, so a pinned and welded muzzle brake is the route I plan to go. A 14.7" was on sale on Black Friday and just happens to fill the gap between my 11.5" pistol and 18" SPR inspired rifle quite nicely. So I'm building one for the hell of it. The difference in muzzle velocity between 14.7 and 16" will be pretty negligible, and a 16" would be too similar to my 18" anyway.
I plan on running the 14.7" upper on my pistol lower for a while to make sure I like the muzzle brake (and the barrel shoots well) before I make it permanent -- but after handling it mocked up in my workspace, I think I'm really going to love it.
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