New upper

[JaxMike01]

I topped my MP 15 lower off with this.

CBC industries 24 inch Bull barrel upper.

Makes for one long AR.
I've only had it to the range once but after sighting in the scope...

Not bad for the first outing at 100 yards.


Sent from my iPhone using Tapatalk

 

[Rastoff]

How big is the red dot in the center of your target?

 

[jimbo728]

Nice shooting!
Dont you just love it when a plan comes together?
Jim

 

[Racer X]

Why such a long barrel? The powder stops accelerating the bullet at about 20" for .223/5.56 rounds. If you have iron sights, the longer sight base would help accuracy, but that's not the case here.

Not critical, just asking.

Who makes that free floating lightweight handguard? I REALLY like it.

 

[Rastoff]

Why such a long barrel? The powder stops accelerating the bullet at about 20" for .223/5.56 rounds.

I used to believe the same thing, but have learned more. Yes, the powder is done burning at about 18"-22", but that doesn't mean the pressure just disappears. It might not be building, but it's still pushing. The extra 4" will give you a higher velocity without increasing the chamber pressure. This is a good thing when looking for maximum accuracy at longer distances. Out to 200 yards it's only a marginal difference. However, when you get out to 300-500 yards it makes a dramatic difference.

 

[bamashooter]

Nice weapon and all but I'm curious with what you have there (upper), why you didn't mate it to a fixed stock?

 

[Warren Sear]

I used to believe the same thing, but have learned more. Yes, the powder is done burning at about 18"-22", but that doesn't mean the pressure just disappears. It might not be building, but it's still pushing. The extra 4" will give you a higher velocity without increasing the chamber pressure. This is a good thing when looking for maximum accuracy at longer distances. Out to 200 yards it's only a marginal difference. However, when you get out to 300-500 yards it makes a dramatic difference.

^^^ Wut he said.

I had a Colt with a 24" barrel (I installed it aftermarket) and 4-12x variable scope. It made a great gun for prairie dog shooting.

 

[Racer X]

Good to know. Thanks for the info.

 

[wylie won]

Nice weapon and all but I'm curious with what you have there (upper), why you didn't mate it to a fixed stock?

Agreed! I put a 20" barrel with a rifle length gas system on one of my AR's. I installed a Luth AR MBA 1 (fixed stock) on it. I LOVE the stability.

 

[wylie won]

I used to believe the same thing, but have learned more. Yes, the powder is done burning at about 18"-22", but that doesn't mean the pressure just disappears. It might not be building, but it's still pushing. The extra 4" will give you a higher velocity without increasing the chamber pressure. This is a good thing when looking for maximum accuracy at longer distances. Out to 200 yards it's only a marginal difference. However, when you get out to 300-500 yards it makes a dramatic difference.

I have a Savage 12FV in 223 with a 26" barrel. I get crazy velocities out of that rifle. It is probably the most accurate rifle I own. I have zero issues hitting steel at 400 and 500 yards.

 

[JaxMike01]

How big is the red dot in the center of your target?

The red dot is 1.5 inch. I'm still trying to figure out what ammo it likes. Seems to do better with 75gr.


Sent from my iPhone using Tapatalk

 

[JaxMike01]

Nice weapon and all but I'm curious with what you have there (upper), why you didn't mate it to a fixed stock?

I got the upper complete and just mated it to my MP 15 lower to take it to the range. I'm in the process of building a lower for it now. I am considering a fixed stock though.


Sent from my iPhone using Tapatalk

 

[JaxMike01]

^^^ Wut he said.



I had a Colt with a 24" barrel (I installed it aftermarket) and 4-12x variable scope. It made a great gun for prairie dog shooting.

I'm actually hoping to take it prairie dog hunting. I'll need a better scope, I just had the center point lying around.


Sent from my iPhone using Tapatalk

 

[JaxMike01]

Finished product (for now) I'm still working on the best ammo for it. With a 1:8 twist it seems to like 75gr. I'm getting things together to start reloading so hopefully I can load some precision ammo. After some trial and error I'm sure.


Sent from my iPhone using Tapatalk

 

[Racer X]

Who makes that free floating lightweight hand guard? I REALLY like it.

 

[mobiless2]

Who makes that free floating lightweight hand guard? I REALLY like it.

AR-15 Rail - 15" CBC Arms Keymod AR-15 Handguard / Rail – CBC INDUSTRIES

 

[MistWolf]

...The extra 4" will give you a higher velocity...

How much extra velocity?

 

[hdwhit]

JaxMike01, you should be very happy. Looks like a quality component. Congratulations.

 

[Racer X]

How much extra velocity?

223 Remington/ 5.56mm NATO barrel length and velocity: 26 inches to 6 inches – rifleshooter.com

 

[MistWolf]

223 Remington/ 5.56mm NATO barrel length and velocity: 26 inches to 6 inches – rifleshooter.com

Out of four different loads, the difference in velocity between a 24 inch barrel and a 20 inch barrel was 100 fps or less. One load showed a 200 fps difference, but has less velocity than another load with the same weight bullet.

The juice ain't with the squeeze.