5.56/300 blackout set

[outrider58]

Let me guess...pink?

Lol!

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[Magnumite]

I loved the 7mmTCU when I was into TC Contenders and silhouettes. It is an awesome caliber.

I used mine for the long range (100-200m) event at the Masters tournament

 

[Pinecone]

Let me guess...pink?

Lol!

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Uuh, NO.

FDE handguard and pistol grip.

 

[Melnic]

This subject got me concerned so I did some mixing of components.

I ran a non scientific test to see if this was a dangerous combination as I have different caliber uppers. I made up cartridges for .223 and 300 BO with a primer but no powder. I tried mix and match in my uppers and could not get either to chamber in the other calibers chamber. They were almost 1/4 inch out of battery so I don't see any chance of ignition.

I use 150 gn bullets in the 300 which may make a difference. I don't have any shorter bullets to try so I don't know if the store bought 120's would be a problem. None of the primers detonated during my testing.

I did the same and compared OAL for several 300 loads. Some factory and some My reloads.

If the OAL is long enough, the. Only will not close. But some will. Especially under conditions of a shorter OAL or say a lighter crimp. Even worse if you decide to use the forward assist.

300blk loads it seems can be all over the map

EDIT: FYI, yes, I pulled firing pin before I test chambered the factory loaded stuff.
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[ar15dave]

Until you pop a mag for .300 BO into the lower with the .223 upper installed.

It WILL chamber and fire the .300 round. ONE ROUND.

I have engraved dust covers for almost all my uppers so that does not happen.

Dave

 

[John from MD]

I never closed a dust cover in my life. I would never see the markings.

 

[teratos]

I never closed a dust cover in my life. I would never see the markings.

You can always look at it to make sure.

 

[John from MD]

I look at the hole in the barrel to make sure.

 

[teratos]

I look at the hole in the barrel to make sure.

That works...

 

[Magnumite]

Well, I am thankful to this being brought up. I do thank the folks in the know

 

[DaemonAssassin]

My only 300 BLK is engraved 300 AAC BLACKOUT on the side of the upper. Not to mention it has a BCM KMR 13 rail on it, while all the others are sporting a SI Megafins G2 13" rail.

 

[outrider58]

I look at the hole in the barrel to make sure.

That works...

Hey, what's so funny bout that?

 

[outrider58]

Uuh, NO.

FDE handguard and pistol grip.

Never drop your right around me...I'll take the shot.