Convert 5.56 to 300 Black out?

[the_great_goretzki]

Hey new to the calibers and also Ar platform can you convert a ar-15 in 5.56 to a 300 black out? What would you have to do and how much work is involved?

Thanks in advance!

Ps what other caliber could to convert a 5.56 into?

 

[Gr33zi3]

Not much to do with AR's now that they're prohibited.

.300 blk just needs a new barrel. Take 556 brass and trim to length then load

 

[rommelrommel]

If you’re willing to buy a new bolt there are a lot of potential calibers that will fit in a AR15 length action. 6.8spc, 6.5 grendel, 450 bushmaster, 458 socom, 50 Beowulf, 224 valk, etc.

 

[the_great_goretzki]

Not much to do with AR's now that they're prohibited.

.300 blk just needs a new barrel. Take 556 brass and trim to length then load

I have one of the few Non restricted ar style guns. Sonic I bought a new barrel and some .300 blackout ammo I would be good to go?

 

[the_great_goretzki]

If you’re willing to buy a new bolt there are a lot of potential calibers that will fit in a AR15 length action. 6.8spc, 6.5 grendel, 450 bushmaster, 458 socom, 50 Beowulf, 224 valk, etc.

Looking for something that I could take moose hunting with potentially.... I guess barrel twist would be dependant on the caliber then.

 

[rommelrommel]

6.8 spc or a big bore would be my pic. Some ejection ports are too small for the big bores tho.

 

[MkivSupra]

Yup. Just a barrel assuming your existing gas block works with the barrels diameter. Might need a different buffer

 

[Fuzzy Wool Hat]

I’m no expert, but I think I’d want something a little bigger than .300 blackout for moose. I mean, sure you could probably pull it off, but why would you when there’s so many other options?

 

[Zhengtianwang]

Go .450 bushmaster and 458 socom.

 

[Valsa]

You will need a barrel. You will need to verify the buffer weight and the bolt extractor.

 

[RoughneckRico]

Looking for something that I could take moose hunting with potentially.... I guess barrel twist would be dependant on the caliber then.

Id go with the 6.5 grendel, you may want to install an adjustable gas block and switch out your buffer and buffer spring as well as the bolt in the bolt carrier.

Should be good for deer hunting up to 300yds, however im not sure Id go moose hunting with it.

My 2cents.

 

[jechlu]

I’m no expert, but I think I’d want something a little bigger than .300 blackout for moose. I mean, sure you could probably pull it off, but why would you when there’s so many other options?

300blk is the same bullet as a 308. Bullet is not the issue it's more than capable at taking down moose. Depending on setup, it's usually with a shorter barrel and better suited for short distances.

 

[Fuzzy Wool Hat]

300blk is the same bullet as a 308. Bullet is not the issue it's more than capable at taking down moose. Depending on setup, it's usually with a shorter barrel and better suited for short distances.

yes, i understand projectile diameter. But I was referring to the cartridge as a whole. Even comparing it to the .308 Winchester, the 300 blk has lower velocity, case capacity, ballistic coefficient, ft/lbs of energy, and not nearly as flat of a trajectory.