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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles.

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  #1  
Old 01-03-2016, 7:17 PM
crusader5.7 crusader5.7 is offline
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Default Need help with AR Pistol 7.5

Went out the the range out in Stanton CA yesterday to shoot my AR Pistol for first time with the new upper I had put on. I noticed it was throwing out sparks kind of like a shot gun effect. I'm running a 5.56 7.5" barrel with the Strike Industry Cookie Cutter (very loud by the way haha) everything cycled nicely no malfunctions just the Sparks coming out the muzzle wondering if it was normal. Got lots of attention from ppl when they seen the Sparks and heard. Shot some PMC by the way.


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  #2  
Old 01-03-2016, 7:26 PM
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you mean the fireball from muzzle flash? thats normal
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Old 01-03-2016, 7:31 PM
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I think he means actual sparks with the flash. Probably unburned powder, Its not uncommon. I think it depends on the ammo you're using
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Old 01-03-2016, 7:50 PM
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Originally Posted by dyson View Post
you mean the fireball from muzzle flash? thats normal

No actual sparks blow to the sides with fireball. It's very noticeable to the point where you can distinguish fireball from sparks.


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Old 01-03-2016, 7:52 PM
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Originally Posted by XD40Kyle View Post
I think he means actual sparks with the flash. Probably unburned powder, Its not uncommon. I think it depends on the ammo you're using

Yea that's the only thing I could of came up with and one of my range buds was saying the same thing but just wanted to make sure.


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Old 01-03-2016, 8:11 PM
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i would say normal. if you don't see any strike marks on anything, i would not stress about it. probably just burning powder in open air.
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  #7  
Old 01-03-2016, 9:09 PM
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It's the 7.5 combined with the brake. Try a flash hider. You will be surprised how light the recoil is anyway.
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Old 01-03-2016, 11:30 PM
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cobination of the cookie cutter and unburned powder escaping.
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Old 01-03-2016, 11:41 PM
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Get some sweet pics to help us evaluate...:-)
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Old 01-04-2016, 12:00 AM
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As a rule of thumb, I've read it takes about 5"-5.5" of dwell to burn off the powder.

If you have a pistol gas system (4") with a 7.5" barrel, you only have about 3.5" of dwell. Hence the muzzle blast.
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Old 01-04-2016, 9:05 AM
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I use reloads with H322 powder. It's a faster burning powder and creates less fireball than slower burning rifle powders. When I want to clear nearby lanes I'll switch to 26.5 grn Varget loads.
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Old 01-04-2016, 9:51 AM
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I have the same setup and yes I have seen sparks with some ammo. Definitely a novelty setup but is fun if you can handle the hell it creates
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Old 01-04-2016, 12:28 PM
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Originally Posted by Joe Blowitup View Post
I have the same setup and yes I have seen sparks with some ammo. Definitely a novelty setup but is fun if you can handle the hell it creates
I have to question your choice of shooting spots. It appears from the photo you're shooting downhill into a forest. You have no backstop. You have no way of verifying where your rounds are landing. Your rounds need to be fired into a dirt backstop. Hitting live trees and who knows who or what else is not good.
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  #14  
Old 01-04-2016, 1:05 PM
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make sure you keep your fingers away from those ports lol.
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Old 01-04-2016, 1:38 PM
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Originally Posted by k1dude View Post
I have to question your choice of shooting spots. It appears from the photo you're shooting downhill into a forest. You have no backstop. You have no way of verifying where your rounds are landing. Your rounds need to be fired into a dirt backstop. Hitting live trees and who knows who or what else is not good.
What you don't see is the backstop about 80 yards out with a clear line of sight. All the rounds that hit that target hit the ground about 15 feet behind it. This spot is very safe.
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Old 01-04-2016, 1:40 PM
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make sure you keep your fingers away from those ports lol.
That's what the cheep green lazer is for. More of a hand stop.
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Old 01-04-2016, 2:03 PM
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Originally Posted by Joe Blowitup View Post
What you don't see is the backstop about 80 yards out with a clear line of sight. All the rounds that hit that target hit the ground about 15 feet behind it. This spot is very safe.
Sounds good. I figured it was something like that. Just wanted to clarify.

Nice looking pistol BTW.
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  #18  
Old 01-04-2016, 4:51 PM
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my brothers 5.56 does the same thing... we ended up looking into the puzzle break and seeing some excess metal bur inside the cookie cutter and filed it off..

i have it on my 7.62x39 and it doesn't have that problem..

but

(don't mind the shouldering, the photo was taken pre letter) but it shows the sparks and u can see them over the hat




this bronze ar is my 7.62x39 pistol

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  #19  
Old 01-04-2016, 4:55 PM
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Quote:
Originally Posted by liber View Post
As a rule of thumb, I've read it takes about 5"-5.5" of dwell to burn off the powder.

If you have a pistol gas system (4") with a 7.5" barrel, you only have about 3.5" of dwell. Hence the muzzle blast.
Wouldn't barrel length have a lot more to do with burning up powder than dwell time?
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  #20  
Old 01-04-2016, 6:46 PM
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On my 7.5 h335 powder had fireball and powder specs I switched to w748 and no more powder specs and almost no fireball
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Old 01-05-2016, 4:23 PM
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I thought 7.5 were just for the fireballs?
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Old 01-05-2016, 4:51 PM
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Quote:
Originally Posted by Click Boom View Post
Wouldn't barrel length have a lot more to do with burning up powder than dwell time?
I think there are several factors, but the gas port and the end of the barrel play a big part in it. Of course the type of powder as well. Once it reaches the end of the barrel, the unburned powder turns to flame as it is exposed to air.

It's not just barrel length, but where the gas port is in relation to the end of the barrel, AFAIK.

Maybe someone like Randall can comment if they see this thread.
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Old 01-14-2016, 6:45 PM
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Quote:
Originally Posted by doug5551 View Post
Get some sweet pics to help us evaluate...:-)

I had my girlfriend recording but some how it didn't save. Wish I did .


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  #24  
Old 01-14-2016, 6:50 PM
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Quote:
Originally Posted by GOLDEN GUN View Post
my brothers 5.56 does the same thing... we ended up looking into the puzzle break and seeing some excess metal bur inside the cookie cutter and filed it off..

i have it on my 7.62x39 and it doesn't have that problem..

but

(don't mind the shouldering, the photo was taken pre letter) but it shows the sparks and u can see them over the hat




this bronze ar is my 7.62x39 pistol


That thing is sick!!! Love the cerakote color. Maby my next lower build I do will be going with that.


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  #25  
Old 01-14-2016, 6:54 PM
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Quote:
Originally Posted by Joe Blowitup View Post
I have the same setup and yes I have seen sparks with some ammo. Definitely a novelty setup but is fun if you can handle the hell it creates

Okay good, then I'm not the only one lol. Nice set up by the way. I actually love everything about that cookie cutter gives it a unique look. The people that hate it is everyone around me at the range lol. Had people almost drop there guns from the blast .


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  #26  
Old 01-14-2016, 6:55 PM
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Quote:
Originally Posted by GOLDEN GUN View Post
my brothers 5.56 does the same thing... we ended up looking into the puzzle break and seeing some excess metal bur inside the cookie cutter and filed it off..

i have it on my 7.62x39 and it doesn't have that problem..

but

(don't mind the shouldering, the photo was taken pre letter) but it shows the sparks and u can see them over the hat




this bronze ar is my 7.62x39 pistol


I was told locally that I could not build/own a pistol like that???

No buttstock, no shouldering it, is that the case?
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Old 01-14-2016, 6:56 PM
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Thanks everyone for the replies. Very helpful


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  #28  
Old 01-14-2016, 7:06 PM
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Quote:
Originally Posted by liber View Post
I think there are several factors, but the gas port and the end of the barrel play a big part in it. Of course the type of powder as well. Once it reaches the end of the barrel, the unburned powder turns to flame as it is exposed to air.
It's not just barrel length, but where the gas port is in relation to the end of the barrel, AFAIK.
Maybe someone like Randall can comment if they see this thread.
Well I'm not Randall but a centerfire cartridge will still be burning powder when the bullet leaves the barrel in any reasonable barrel length. That means longer than 34 inches or so. The gas port makes no difference because powder is still burning way past the gas port.
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