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geepee3

9mm RDB AR Pistol Upper is Complete.

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Now I just need to get out and shoot it!!!

This looks to be my only AR build for 2020...

First the picture;

 

GPwJsUk.jpg

 

The core of this build is the CMMG 9mm Radial delayed Blowback 8" barrel and BCG combo.

 

umJkxQH.jpg

 

If you remember, I built a 9mm PCC using the CMMG RDB combo. Liked it so much I wanted to put an AR pistol together.

As you see in the picture, I'm set up to use the same 9mm ARC magazine inserts I use for the carbine.   

Here are the upper parts used;

 

qG4WnW6.jpg?1

 

Davidson Defense Billet slick side upper, with Milspec ejection cover installed by me.

Davidson Defense 7" M-LOK free float handguard,

CMMG 9mm RDB barrel and BCG,

BCM Gunfighter ambi charging handle.

VG6 Gamma 9MM brake.

Added a M-LOK AFG, not pictured above.

 

With no gas system it is a simple build,

Used my No-Mar upper block to assemble and torque the barrel nut/muzzle brake down.

The handguard is a clamp-on and both the upper receiver and handguard are drilled from the manufacturer so an anti-rotation pin can be inserted. Which I did.

 

Hopefully I will be able to shoot this firearm tomorrow and give you a range report.

With COVID-19, this will be my first trip to the public range since February.

 

Thanks, will let you know how things turn out.

 

Glenn

  

 

  

 

 

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Very nice !

 

It's my understanding that CMMG warmed up some brain cells and pulled out some hair

over a period of years to get that RDB system just right.     :thumb:

 

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Was able to get to the range this morning.

A few changes from when I was last there in February.

Half capacity and two hour time limit.

Fortunately there were a few lanes open when I got there, so no waiting.

 

Right now I have a grin that goes from ear to ear...

This 9mm RDB AR pistol is a real joy to shoot.

She had zero issues! Ate everything I fed her, both hollow point and FMJ in 115 gr. and 124 gr.

This pistol, because of the RDB system, has very little recoil.

What's really nice is I can use a two stage trigger, which is what I prefer and normal AR carbine buffers and springs. I am using an H1 buffer.

 

Also have a 22LR AR pistol upper that goes with the lower. I put the 22LR upper together last year.

 

 bt0BbxF.jpg

 

The two go together nicely for a cheap day at the range.

 

Thanks!

 

Glenn

 

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31 minutes ago, Retcop said:

Very nice !

 

It's my understanding that CMMG warmed up some brain cells and pulled out some hair

over a period of years to get that RDB system just right.     :thumb:

 

 

Thank you!

 

Well whatever CMMG did, I'm enjoying the fruits of their labor. 

Both the carbine and pistol I have really impressed me.

With the Magpul conversion magazine inserts, any Milspec AR-15 lower can be used with the CMMG 9mm RDB uppers.

 

Thanks again,

Glenn 

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34 minutes ago, geepee3 said:

 

Thank you!

 

Well whatever CMMG did, I'm enjoying the fruits of their labor. 

Both the carbine and pistol I have really impressed me.

With the Magpul conversion magazine inserts, any Milspec AR-15 lower can be used with the CMMG 9mm RDB uppers.

 

Thanks again,

Glenn 

 

I thought the story was great, and that RDB is a right nifty piece of engineering. 

Enjoy ! 

 

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