WeTheArmed.com

Weapons and Gear => Rifles => Topic started by: booksmart on August 23, 2016, 11:21:36 am

Title: FrankenAR Build Question
Post by: booksmart on August 23, 2016, 11:21:36 am
I recently upgraded my 300BLK AR to an AeroPrecision M4E upper & forearm, around the CMMG barrel from her original incarnation (pics to come soon; she's lookin' sweet).

Anyway, that leaves me with the CMMG upper reciever laying around.

I'm a gearhead; having something loose and unutilized offends me.

Sooo... there're some sales going on this week I was thinking of taking advantage of:

Stag Arms 20" Heavy Barrel:
https://www.stagarms.com/sale-20-5-56-heavy-barrel/?utm_campaign=Email+Blasts&utm_medium=email&_hsenc=p2ANqtz-_zzDxmpzI63srX0_JkHO2Y8savpzsBoHmrsRPiy57Z4Gvl43DK_zBuYEiookHD9H36u6C-Cw6LOtTkpLDQBdDv8E1twg&_hsmi=33252128&utm_content=33252128&utm_source=hs_email&hsCtaTracking=0ea35f42-041c-458f-b4f3-a91449f910f5%7C96c51593-9d5e-4ba3-8d80-02974b28c8e8 (https://www.stagarms.com/sale-20-5-56-heavy-barrel/?utm_campaign=Email+Blasts&utm_medium=email&_hsenc=p2ANqtz-_zzDxmpzI63srX0_JkHO2Y8savpzsBoHmrsRPiy57Z4Gvl43DK_zBuYEiookHD9H36u6C-Cw6LOtTkpLDQBdDv8E1twg&_hsmi=33252128&utm_content=33252128&utm_source=hs_email&hsCtaTracking=0ea35f42-041c-458f-b4f3-a91449f910f5%7C96c51593-9d5e-4ba3-8d80-02974b28c8e8)

AeroPrecision 15" Keymod forearm, w/ barrell nut:
http://aeroprecisionusa.com/ar15-quantum-keymod-handguards.html?sc_src=email_610041&sc_lid=21254386&sc_uid=ostjDdoHic&sc_llid=49745&sc_eh=4b8133e1e8954cd11 (http://aeroprecisionusa.com/ar15-quantum-keymod-handguards.html?sc_src=email_610041&sc_lid=21254386&sc_uid=ostjDdoHic&sc_llid=49745&sc_eh=4b8133e1e8954cd11)

This is the same forearm I put on my 300BLK, and I'm quite happy with it (I got the M4E upper & forearm together on sale).

I'd move the BCG between the uppers, as 5.56 & 300BLK share boltfaces. 

I'd probably get the MagPul MBUS's again for sights... maybe upgrade to the metal ones.  Eventually add a good scope.

The reason for the build is to add something a little more long distance, since I've got near ranges covered with the 300BLK.

The other option is to sell the upper, 'cuz I don't *really NEED* to be able to shoot long distances.  I live in suburbia, not the boondocks, and with the 300BLK I can shoot as far as I can see in my neighborhood (not that I've tried that, mind you  :whistle ).

My thoughts mostly revolve around the barrell - is Stag Arms decent quality?
Title: Re: FrankenAR Build Question
Post by: sqlbullet on August 23, 2016, 12:05:24 pm
...
The reason for the build is to add something a little more long distance, since I've got near ranges covered with the 300BLK.
...
My thoughts mostly revolve around the barrell - is Stag Arms decent quality?

The quality of the barrel is fine.  The appropriateness of a 1:9 twist for something "a little more long distance" is what would concern me.

That speaks to me that you might lean towards the 77 grain bullets more than 55/62 grain.  The 77's certainly have great BC's for longer range shooting.  And the 1:9 twist is at best marginal for bullets that length.  I would suggest you want a 1:8 or ideally a 1:7 barrel if the goal is a little more long distance shooting.

my 2ยข.
Title: Re: FrankenAR Build Question
Post by: booksmart on August 23, 2016, 12:06:56 pm
I'll take all the sense I can get... ;)
Title: Re: FrankenAR Build Question
Post by: ksuguy on August 23, 2016, 12:25:08 pm
I have a 24" Rock River with 1:8.  Works best with really heavy bullets like 75 or 77gr.
Title: Re: FrankenAR Build Question
Post by: booksmart on August 23, 2016, 01:56:29 pm
Hmm. I would prefer to avoid stainless... (I'm not into shiny barrels...)

Anybody else got suggestions for reasonably priced, heavy profile barrels in 1:7-1:8?

How much of a ballistic difference am I looking at between an 18" or 20" barrel?
Title: Re: FrankenAR Build Question
Post by: ksuguy on August 23, 2016, 02:18:03 pm
I was looking at this place for a 7mm-08 barrel for my next AR-10 project.    http://www.x-caliber.net/
Title: Re: FrankenAR Build Question
Post by: JesseL on August 23, 2016, 02:25:01 pm
Hmm. I would prefer to avoid stainless... (I'm not into shiny barrels...)

(http://www.homedepot.com/catalog/productImages/300/17/1710486f-e7af-4c05-96fb-09a3936d6969_300.jpg)
Title: Re: FrankenAR Build Question
Post by: sqlbullet on August 23, 2016, 02:35:33 pm
Not sure what reasonable is.

This would be solid barrel.  It is kinda low/mid-priced.

http://ballisticadvantage.com/20-inch-556-dmr-rifle-length-cmv-performance-barrel.html

This Larue would be just as good IMHO and is a bit cheaper.

http://www.larue.com/556-stealth-barrel