6.8 Rem SPC build
 

Here are the details on the 6.8 SPC I've just finished.

Upper details:

MEGA forged receiver
Bison Armory 16" mid length recon profile barrel finished in black Gun Kote
LMT standard full auto bolt carrier group
LMT enhanced bolt
Daniel Defense Lite Rail 10.0
Magpul XTM rail covers
Vltor low profile gas block
BCM Gunfighter w/ medium latch
Primary Weapon Systems FSC30 compensator/flash hider
Aimpoint CompML3 in a Larue LT129 QD mount
Troy M4 BUIS
Gear Sector 1913 sling swivel mount
Surefire M951 w/ Malkoff M61 LED assembly


Lower Details:

Mega forged receiver
Vltor buffer tube
Spikes ST-T2 buffer
Superior Shooting Systems buffer spring
Noveske QD Swivel end plate
G&R Tactical lower parts kit
Bill Springfield modded fire control group
Magpul UBR
Larue Harris BRM-s / LT706 mount combo

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I've had it to the range several times, and it runs very nicely. I still need a magnified optic for hunting. I probably won't pick one out till summer.

I plan to work up a handload with Barnes 95 grain TTSX for hunting and barrier penetration. For softer targets I guess I'll use Sierra 110 grain Pro-Hunters. I'll probably use Reloder 10X for both.

Grizz

Great looking 6.8 Rem SPC, how long did it take to Build It?????

Clyde

Thanks.

I ordered the first upper part on April 29, and the last on May 17th.

I won't be too surprised if I end up with all of the lower parts before the barrel shows up.

Grizz

That's going to be a fine AR:) Mike

Very nice Grizz!!! Look forward to seeing it finished and ready to shoot!:)

Grizz

Great build. Bison suppose to have great barrels. Guess their specs is the SPCII chamber, 1/11 twist 4 groove?

I have a YHM 16" barrel upper SPCII but the faster 1/10" twist but wanted one for hunting with a slower twist. Just picked up a second hand upper with the 18" Bison SPCII 1/11" 4 twist (have not shot it yet) to see how much velocity gain I can get over the YHM barrel with my reloads.

Thanks for the feedback guys.

Yes, their website says SPCII 1:11 4 groove for the recon profile barrels.

They state in their FAQ that the velocity gain in their barrels from 16 to 18" is approximately 50 fps.

Since I handload, I should be able to get good velocity if I use powder of the right burning rate, and it'll be fun finding that powder.

Grizz

There are not alot of recipes in the books. Most of those were for the original SPC Remington and are low powered. The SPCII allows higher pressure and I think SSA and Hornady are the only ones loading for the SPCII (SSA loads both standard and the hotter Tac loads). There are probably only 4 companies loading 6.8.
Also there are brass with large primers and small, general conscensus is the small primer case handles pressure better.

If you have not checked, there is a great forum (Home of the 6.8) that has a ton of info. Kind of the pioneers who took the original spec to the improved and tons of load development with all kinds of powders, etc.

My plan was to use the books for only a basis for powder recommendation. I plan to ignore the upper limits and work off of velocities and pressure signs. It's not an ideal situation, but it'll work fine.

I also have a subscription to loaddata.com, which may have data not contained in the standard manuals. I just bought some H335 today (haven't found any Alliant 10X in a store yet), and still need to order some bullets online. The two stores I've been in haven't stocked a bullet fully appropriate to the 6.8 SPC.

Even if I don't reach the capabilities of the cartridge, It'll far surpass anything the 5.56 is capable of achieving.

Forgot to add, I'm a member of the 6.8 forum, but haven't spent very much time there.........yet.

Grizz

Good Luck with with the rest of your build, that's going to be a BadAss AR:) Mike