Newb 9mm SBR barrel length?

[Bruins2011]

In the process of buying a 9mm SBR from DDLES. Trying to decide on the barrel length. Its between 5" - 7.5". Im a big guy, big hands long arms. It will be suppressed. I'm a little worried that the 5' will be a little small. Is there any difference in accuracy in the 5" and 7.5" barrel at 100 yards?

[Libertarian_Geek]

9mm, 223, what caliber? I'm assuming 9mm, since DDLES has kick ass 9mm lowers.

Also, it's a myth that shorter barrels are less accurate.

Say it with me:
"It's a myth that shorter barrels are less accurate."

One more time for good measure:
"It's a myth that shorter barrels are less accurate."

Barrel length affects velocity. Choose the barrel length that best facilitates the velocities you want to achieve balanced by the "handiness" you want.

If you're talking .223, then the velocity out of a 5" barrel is going to be pretty pathetic, and you're going to be giving your blast baffle hell. If you're talking 9mm, then go 5" and enjoy.

[Bruins2011]

I fixed that ... its a 9mm. Does the 5" feel small to you?

9mm, 223, what caliber? I'm assuming 9mm, since DDLES has kick ass 9mm lowers.

Also, it's a myth that shorter barrels are less accurate.

Say it with me:
"It's a myth that shorter barrels are less accurate."

One more time for good measure:
"It's a myth that shorter barrels are less accurate."

Barrel length affects velocity. Choose the barrel length that best facilitates the velocities you want to achieve balanced by the "handiness" you want.

If you're talking .223, then the velocity out of a 5" barrel is going to be pretty pathetic, and you're going to be giving your blast baffle hell. If you're talking 9mm, then go 5" and enjoy.

[Bendersquint]

I fixed that ... its a 9mm. Does the 5" feel small to you?

9mm, 223, what caliber? I'm assuming 9mm, since DDLES has kick ass 9mm lowers.

Also, it's a myth that shorter barrels are less accurate.

Say it with me:
"It's a myth that shorter barrels are less accurate."

One more time for good measure:
"It's a myth that shorter barrels are less accurate."

Barrel length affects velocity. Choose the barrel length that best facilitates the velocities you want to achieve balanced by the "handiness" you want.

If you're talking .223, then the velocity out of a 5" barrel is going to be pretty pathetic, and you're going to be giving your blast baffle hell. If you're talking 9mm, then go 5" and enjoy.

5" doesn't feel small to me at all, if you think about it you are talking about 2.5 inches.

If its that much a concern for barrel length, get a longer handguard or longer suppressor to make it longer overall.

[Libertarian_Geek]

My 5" 9mm AR feels perfect with the can on it.

Try to explain what actual ergonomic problems you'd encounter with the concept of "too short". I think that once you think through it, you'll realize that it just gets really darn handy to have it short. It just may not be what you're used to, but that goes away with time.

[Bruins2011]

My main concern is grip space and sight radius. What rail is that and how long is it? What suppressor do you have on it?

Thanks for all the info! I'm leaning towards the 5"

My 5" 9mm AR feels perfect with the can on it.

Try to explain what actual ergonomic problems you'd encounter with the concept of "too short". I think that once you think through it, you'll realize that it just gets really darn handy to have it short. It just may not be what you're used to, but that goes away with time.

[Bendersquint]

My main concern is grip space and sight radius. What rail is that and how long is it? What suppressor do you have on it?

Thanks for all the info! I'm leaning towards the 5"

My 5" 9mm AR feels perfect with the can on it.

Try to explain what actual ergonomic problems you'd encounter with the concept of "too short". I think that once you think through it, you'll realize that it just gets really darn handy to have it short. It just may not be what you're used to, but that goes away with time.

Looks like a rifle length rail to me.

[Bruins2011]

I ended up picking the 5.25 inch barrel and 6.35 inch ddles hand rail with the kx3 flash suppressor.

[Bendersquint]

I ended up picking the 5.25 inch barrel and 6.35 inch ddles hand rail with the kx3 flash suppressor.

KX3 for a 9mm?

You were worried about length and you went with that short a handguard?

[Tango2249]

My 5" 9mm AR feels perfect with the can on it.

Try to explain what actual ergonomic problems you'd encounter with the concept of "too short". I think that once you think through it, you'll realize that it just gets really darn handy to have it short. It just may not be what you're used to, but that goes away with time.

What rail do you have on there?

[Libertarian_Geek]

@Tango: It's a Samson Evolution 11" rail. I wanted it to surround the SWR Trident and just leave enough room for me to remove it from the barrel. It gives me a good long sight radius too (and room for a future IR laser and eotech). It's real quiet. I can't wait to try it out on a hog or twelve.

I use tool-dip/plasti-dip on the bottoms of my converted uzi mags. It make them more comfy to slap home (and it's completely removable.)

@Bruno: To BS's point(or at least mine)... You do realize that the hole in the KX3 isn't large enough for a 9mm projectile to pass through, right? Did you drill it (and the "cone")?

[Bendersquint]

@Tango: It's a Samson Evolution 11" rail. I wanted it to surround the SWR Trident and just leave enough room for me to remove it from the barrel. It gives me a good long sight radius too (and room for a future IR laser and eotech). It's real quiet. I can't wait to try it out on a hog or twelve.

I use tool-dip/plasti-dip on the bottoms of my converted uzi mags. It make them more comfy to slap home (and it's completely removable.)

@Bruno: To BS's point(or at least mine)... You do realize that the hole in the KX3 isn't large enough for a 9mm projectile to pass through, right? Did you drill it (and the "cone")?

That was my point as well was that the KX3 is not suitable for a 9mm. In fact a KX3 that was bored out for 9mm was classified in one determination as a silencer since it created a chamber to collect gases more than the approved chamber from the BATFE.

Borer beware.

[Bruins2011]

The KX3 is coming from DDLES. They recommended as a safe way to shoot the SBR without a can on it.

@Tango: It's a Samson Evolution 11" rail. I wanted it to surround the SWR Trident and just leave enough room for me to remove it from the barrel. It gives me a good long sight radius too (and room for a future IR laser and eotech). It's real quiet. I can't wait to try it out on a hog or twelve.

I use tool-dip/plasti-dip on the bottoms of my converted uzi mags. It make them more comfy to slap home (and it's completely removable.)

@Bruno: To BS's point(or at least mine)... You do realize that the hole in the KX3 isn't large enough for a 9mm projectile to pass through, right? Did you drill it (and the "cone")?

That was my point as well was that the KX3 is not suitable for a 9mm. In fact a KX3 that was bored out for 9mm was classified in one determination as a silencer since it created a chamber to collect gases more than the approved chamber from the BATFE.

Borer beware.

[Bendersquint]

The KX3 is coming from DDLES. They recommended as a safe way to shoot the SBR without a can on it.

@Tango: It's a Samson Evolution 11" rail. I wanted it to surround the SWR Trident and just leave enough room for me to remove it from the barrel. It gives me a good long sight radius too (and room for a future IR laser and eotech). It's real quiet. I can't wait to try it out on a hog or twelve.

I use tool-dip/plasti-dip on the bottoms of my converted uzi mags. It make them more comfy to slap home (and it's completely removable.)

@Bruno: To BS's point(or at least mine)... You do realize that the hole in the KX3 isn't large enough for a 9mm projectile to pass through, right? Did you drill it (and the "cone")?

That was my point as well was that the KX3 is not suitable for a 9mm. In fact a KX3 that was bored out for 9mm was classified in one determination as a silencer since it created a chamber to collect gases more than the approved chamber from the BATFE.

Borer beware.

Are you talking abuot a 5.56mm now or still the topic of 9mm?

[Bruins2011]

Its the 9mm.... its an option on the upper.


Are you talking abuot a 5.56mm now or still the topic of 9mm?[/quote]

[Bendersquint]

Its the 9mm.... its an option on the upper.


Are you talking abuot a 5.56mm now or still the topic of 9mm?

[/quote]

Not sure how they are legally boring open a KX3. The only 9mm KX3 I have seen was registered as a silencer.

Got a link?

[Libertarian_Geek]

Don't assume that the choices you can make on DDLES's order page are all valid combinations. They may fit, but may not work. Please understand what I mean here by "may not work". I mean catastrophically. As in, "may cause injury or death".

Give them a call if you have a doubt. It would be good to double check. I would hate to find out the hard way that the aperture is large enough for 9mm, but the internal cone isn't concentric enough, or has enough play for a strike (or worse, that the aperture is too small).

If it all works out, I'd love to hear about your results. Actually, either way, I'd love to hear about your results.

[Bruins2011]

I placed the order over the phone.....they recommended the set up!

Don't assume that the choices you can make on DDLES's order page are all valid combinations. They may fit, but may not work. Please understand what I mean here by "may not work". I mean catastrophically. As in, "may cause injury or death".

Give them a call if you have a doubt. It would be good to double check. I would hate to find out the hard way that the aperture is large enough for 9mm, but the internal cone isn't concentric enough, or has enough play for a strike (or worse, that the aperture is too small).

If it all works out, I'd love to hear about your results. Actually, either way, I'd love to hear about your results.

[Libertarian_Geek]

Interesting.

I'd be cautious. Assuming that it works, I'm also curious to know if it will actually help to "throw" more of the sound away from the shooter for 9mm.

I'd use a real heavy buffer (Spike's pistol buffer) because your lower is going to take a beating already. With a pig on the end, it's going to increase back-pressure (like a can would).

Be safe and let us know how it works out. It should look kick-ass either way.

[beanfield33]

Its the 9mm.... its an option on the upper.


Are you talking abuot a 5.56mm now or still the topic of 9mm?

Not sure how they are legally boring open a KX3. The only 9mm KX3 I have seen was registered as a silencer.

Got a link?[/quote]

FWIW, someone in this thread claims a stock kx3 has a large enough bore for 9mm. http://www.ar15.com/mobile/topic.html?b ... 26&page=49

[Libertarian_Geek]

I'm intrigued

[Bendersquint]

Its the 9mm.... its an option on the upper.


Are you talking abuot a 5.56mm now or still the topic of 9mm?

Not sure how they are legally boring open a KX3. The only 9mm KX3 I have seen was registered as a silencer.

Got a link?

FWIW, someone in this thread claims a stock kx3 has a large enough bore for 9mm. http://www.ar15.com/mobile/topic.html?b ... 26&page=49[/quote]

Mine must be really really old(its pre serial numbers) since the bore on it was .30"

[Flipz]

@Tango: It's a Samson Evolution 11" rail. I wanted it to surround the SWR Trident and just leave enough room for me to remove it from the barrel. It gives me a good long sight radius too (and room for a future IR laser and eotech). It's real quiet. I can't wait to try it out on a hog or twelve.

I use tool-dip/plasti-dip on the bottoms of my converted uzi mags. It make them more comfy to slap home (and it's completely removable.)

I was wondering if you still have enough room between the Evolution Rail and Trident9 to mount one of the rail sections to the rail? It looks like there may not be enough room to fit the mounting bracket between the suppressor and the inside of the rail. If you could let me know id greatly appreciate it.

Also, great idea to use the Plasti-Dip on the bottom of the mags.

[Libertarian_Geek]

@Tango: It's a Samson Evolution 11" rail. I wanted it to surround the SWR Trident and just leave enough room for me to remove it from the barrel. It gives me a good long sight radius too (and room for a future IR laser and eotech). It's real quiet. I can't wait to try it out on a hog or twelve.

I use tool-dip/plasti-dip on the bottoms of my converted uzi mags. It make them more comfy to slap home (and it's completely removable.)

I was wondering if you still have enough room between the Evolution Rail and Trident9 to mount one of the rail sections to the rail? It looks like there may not be enough room to fit the mounting bracket between the suppressor and the inside of the rail. If you could let me know id greatly appreciate it.

Your correct, there's not enough room to fit the backside of the mounting bracket where the can is. My flashlight rail is behind the can on the right (but I'm not happy with its position there). I'm considering having someone TIG weld a rail section up front left at 9 o'clock to remedy this.

Also, great idea to use the Plasti-Dip on the bottom of the mags.

Thanks. I also used it on a cheek rest for my RFB. Kydex + Neoprene + Tooldip.

[twodollarbill]

Mine must be really really old(its pre serial numbers) since the bore on it was .30"

I have a few early Noveske KFH's and I just checked the bores, they measure .385"