6MM fat rat, turbo, turbo 40 upper makers

[svxwilson]

I have been reading on these calibers. Just got my Grendel and am interested in another upper using the Grendel cartridge in a different caliber. I am looking for some recommended companies to make a complete upper in a 6MM setup.

 

[346ci]

Harrison @ ARP has some of his 6mmAR-P SPR barrels/superbolts in stock. He doesn't build uppers anymore though.

20" 6mm AR-P SPR profile barrel- 4150 CMV

 

[BigtimeAub]

I'm currently building my own 6.5 Grendel. However, in my research for this build, I have come to the understanding that the upper for any of those cartridges can be run out of a standard AR15 upper receiver. The difference would be in the bolt/bolt face, head spacing, barrel, and magazine (if there are any, as I haven't looked for them and am not familiar with them). Everything else is standard AR15 parts and accessories.

Someone please correct me if I'm wrong and/or forgetting something. Thanks.

 

[Hummerdawg]

Harrison @ ARP has some of his 6mmAR-P SPR barrels/superbolts in stock. He doesn't build uppers anymore though.

20" 6mm AR-P SPR profile barrel- 4150 CMV

What kind of velocities can be expected out of these 20" barrels?

Thanks for your replies

 

[468shot]

Have a look at this site:

6mm AR Home Page

I had an upper in 6mmAR built by them that was exceptionally accurate.

 

[bustin]

What kind of velocities can be expected out of these 20" barrels?

Thanks for your replies

95smk will hit 2850-2900 with 29gr N530. 8208 works also.

 

[Hummerdawg]

95smk will hit 2850-2900 with 29gr N530. 8208 works also.

Thanks
Is that the best long range combo?

 

[svxwilson]

I'm currently building my own 6.5 Grendel. However, in my research for this build, I have come to the understanding that the upper for any of those cartridges can be run out of a standard AR15 upper receiver. The difference would be in the bolt/bolt face, head spacing, barrel, and magazine (if there are any, as I haven't looked for them and am not familiar with them). Everything else is standard AR15 parts and accessories.

Someone please correct me if I'm wrong and/or forgetting something. Thanks.

You are correct. I am looking for someone or a company that will sell me a complete upper with the correct bolt, and head spacing to the barrel they have. I like to purchase complete uppers if possible. Then if something fails they replace it. Same mags as Grendel to my understanding. I haven't seen this cartridge from any of the companies I aspire to acquire, JP, GAP, LMT, POF, Precission Firearms (is the maker of my Grendel) etc.

Is it because it is not a SAAMI approved that few make these?

 

[bustin]

Thanks
Is that the best long range combo?

If you are asking about best bullet, it is one of the best and inexpensive in 600 count boxes. I can find a good load easier than the 95 Berger. The 105 Lapua is a great bullet but apx 100fps slower.
The barrel is not a bull barrel, it's .850 under the guard and .720 in front of the gas block. It's a walking varmint barrel. Some of the guys are getting 34-3500fps out of the 55gr bullets and some are using 87s on yotes.

 

[Drifter™]

Link: Products 6MM Rat ar 15 uppers 6MM Rat ar15 uppers

 

[Hummerdawg]

Bistin
Thanks for the info