01 July 2009

Carbine Barrel Comparison

Bare barrels. Top is a Del-Ton 16" HBAR, 1:9, chrome-lined. Bottom is a Del-Ton 16" M4 profile, 1:9, chrome-lined. The M4 profile is a half pound lighter than the HBAR. This tracks with the weight difference between the gov't profile M16A2 barrel and the 20" HBAR; the difference there is a full pound.

Mounted. Top is the old HBAR mounted in a slick-side upper, beginnings of Brunhilda! Bottom is Kaylee's C7 upper with her new M4 barrel. Using the 5" slip-over flash hider gives back 5 ounces of the weight difference between the barrels compared to using an M16A2 flash hider, but since she had that hider before, I am still half a pound lighter!

Nose to tail:

Brunhilda: M16A2 flash-hider, 16" 1:9 chrome-lined HBAR barrel, flat slip-ring, M16 upper receiver with A2 ejection port cover.

Kaylee: 5" slip-over flash-hider, 16" 1"9 chrome-lined M4 barrel, delta slip-ring, C7 upper receiver.

2nd-Jul-2009 01:49 am (local)
So which, out of all these configurations, would you want to have with you in a SHTF situation? Me, I'd probably go with my trustly Kalash---but then, that's partly because I've got about 1500 rds. of ammunition for it around here.
2nd-Jul-2009 02:52 am (local)

This is the Hurricane Defense Carbine, also suitable for SHTF.

6.8x43mm, Aimpoint with a AA lithium batt that lasts 8 years left running, flashlight for target ID.
2nd-Jul-2009 02:56 am (local)
The others will work, and work well, but Dottie is the only one built with SHTF in mind. The two M16 clones and the SBR are historical interest builds. Kaylee is the end product of my learning curve. Brunhilda is the also a product of the learning curve, a by-product.

Harvey's SHTF gun, Kevina, is made along similar lines as Dottie, but in 5.56 and with EoTech instead of Aimpoint.

Edited at 2009-07-02 02:56 am (local)
4th-Jul-2009 12:42 am (local)

4th-Jul-2009 01:14 am (local)
This is my SHTF solution.
2nd-Jul-2009 01:58 pm (local)
For SHTF situations, particularly really large ones, I'm not terribly keen on unusual ammunition, no matter how nice the gun itself is. I don't think I've ever heard of 6.8x43mm---what is it when it's at home? Does it have another name?
2nd-Jul-2009 06:49 pm (local)
The 6.8 is Dottie.

6.8x43mm is not unusual any more. It's the second most common chambering for an AR15 now, and growing. It passed .308 a while ago as second most popular, in fact.

It's loaded by Hornady, Remington, S&B and SSA. About 80% the price of .308.

The bonus is all you need to convert to (or from) 6.8 is a barrel, bolt and magazines. Everything else is normal AR, which cannot be said for .308 ARs.

6.8 was designed to surpass 7.62x39mm AND 5.56x45mm at all ranges for both accuracy and terminal effects. 115gr at 2550 with a bc of .314 does that.

If you should decide to get an AR in 6.8, be sure that you are getting the SPC2 chamber and don't get 1:9.5 or 1:10 rifling. The original SAAMI chamber specs from Remington were flat wrong. The designers of the cartridge have said so long and loud. The rifling rates were too fast for the light bullets used, previously .277 was used for benchrest shooting from 24" bolt guns with 130-150gr bullets that needed a 1:10 twist.

SHTF here is bad stuff is happening, but order is expected to return. TEOTWAWKI is where I say, lets use the 5.56 guns because ammo is more common. Do you have a .30-06? If you don't and you preach the ammo commonality gospel...

Edited at 2009-07-02 07:03 pm (local)
3rd-Jul-2009 01:14 am (local)
Actually, around here, I don't know many people who even have a large-caliber rifle, full-stop. Shotguns (thanks to the Iowa hunting laws favoring them) and .22s are quite a bit more common.
3rd-Jul-2009 04:15 pm (local)
Pa has got large-caliber and he is in Iowa.
2nd-Jul-2009 06:59 pm (local)
6.8x43mm aka 6.8 SPC aka 6.8x43mm Special Purpose aka 6.8 Remington.

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