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Seeking 300 Blackout AR upper receivers—suggestions? Login/Join 
Freethinker
Picture of sigfreund
posted
My agency is considering switching our conventional 5.56 ARs to 300 Blackout with ~10.5 inch barrels. Although I’m willing to consider alternatives, it seems to me that it would be most economical while (hopefully) ensuring reliability to purchase barreled upper receivers for the conversion.

Thoughts? Considerations?

If I’m right, suggestions on good quality, but not necessarily top tier components?
Any reason to not use the existing bolt carrier assemblies?




“I can’t give you brains, but I can give you a diploma.”
— The Wizard of Oz
 
Posts: 41174 | Location: 10,150 Feet Above Sea Level in Colorado | Registered: April 04, 2002Reply With QuoteReport This Post
Avoiding
slam fires
Picture of 45 Cal
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I would suggest buying complete uppers and not trying to do barrel switching in house.
I have had good luck with R R but also got some PSA in the mix.
They all seem to run well.
I do not own a blackout,never liked it but I do own a 9X39 but that is an expensive way to go.
 
Posts: 22078 | Location: Georgia | Registered: February 19, 2007Reply With QuoteReport This Post
Freethinker
Picture of sigfreund
posted Hide Post
quote:
Originally posted by 45 Cal:
I would suggest buying complete uppers and not trying to do barrel switching in house.


I agree; barrel switching was the first suggestion that I recommended against.




“I can’t give you brains, but I can give you a diploma.”
— The Wizard of Oz
 
Posts: 41174 | Location: 10,150 Feet Above Sea Level in Colorado | Registered: April 04, 2002Reply With QuoteReport This Post
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Talk to Aero Precision's le sales and ask about an agency purchase. I think you'll find theyre quite reasonable and good quality.


~You are thoroughly confused. Even your confusion is confused. You're confused squared. -Para~
 
Posts: 2094 | Location: Pnw | Registered: March 21, 2009Reply With QuoteReport This Post
Member
Picture of Rustpot
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quote:
Originally posted by sigfreund:
My agency is considering switching our conventional 5.56 ARs to 300 Blackout with ~10.5 inch barrels. Although I’m willing to consider alternatives, it seems to me that it would be most economical while (hopefully) ensuring reliability to purchase barreled upper receivers for the conversion.

Thoughts? Considerations?

If I’m right, suggestions on good quality, but not necessarily top tier components?
Any reason to not use the existing bolt carrier assemblies?


Why switch to 300blk, and why 10.5" barrels? Is suppressed use a consideration? I hope the answer is no, but are subsonic loads a consideration?

Most people will tell you to go with an adjustable gas block, but for a department it's easier to work with a company that knows how to select gas port sizes and just tune the buffer weight as needed for the duty ammo and be done with it, and have less points of failure.

Have your armorer check headspace and run through the BCGs before reusing them. Good opportunity for a full teardown and inspection, new extractor springs and gas rings, etc. No reason to not reuse them if they pass inspection and the 5.56 guns are being retired.

If you're betting your life on it I would avoid "budget" choices and go with solid factory built uppers.

Admittedly this might sound like a brand shill, but I would recommend giving a call to Sons Of Liberty Gun Works and talking to Kyle or Mike about what you need. They have extensive LE services including armorer service/training, loaner guns, T&E, trade-ins, and discounts for officers. Some of the most approachable guys I've talked to, very knowledgeable, and a quality-first mindset.
https://sonsoflibertygw.com/agency-purchases/
 
Posts: 5788 | Location: Romeo, MI | Registered: January 03, 2009Reply With QuoteReport This Post
For real?
Picture of Chowser
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We looked at the FN 12” 300blk uppers for unsuppressed supersonic use but decided to stick with the 14.5” 5.56 FN rifles because everyone around us is still 5.56. We’re budgeting for new rifles this fall. I’m still going to push the 300blk but it’s not looking good.



Not minority enough!
 
Posts: 6482 | Location: Cleveland, OH | Registered: August 09, 2007Reply With QuoteReport This Post
Member
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I would also consider barreled uppers or new guns. Building them is fine and all, until you have to do a bunch of them and deal with the teething issues.

One thing I would also think about is how your lowers are marked. Does the agency want lowers marked 5.56 with 300 uppers? Do you trust your people to not somehow mess it up. The biggest concern I have with 300 is the potential to confuse ammunition and damage something or hurt somebody. Even as an agency-wide change, do your people take their rifles home? How many have 5.56 at home?

How much admin time are you willing to put into cobbling guns together versus just buying new ones, particularly if whatever you have will have reasonable trade value?

I also agree that SOLGW is worth talking to.
 
Posts: 3205 | Location: Iowa | Registered: February 24, 2011Reply With QuoteReport This Post
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